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Younger Dryas - Wikipedia

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<span class="vector-toc-numb">4</span> <span>Cause</span> </div> </a> <button aria-controls="toc-Cause-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Cause subsection</span> </button> <ul id="toc-Cause-sublist" class="vector-toc-list"> <li id="toc-Younger_Dryas_impact_hypothesis" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Younger_Dryas_impact_hypothesis"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1</span> <span>Younger Dryas impact hypothesis</span> </div> </a> <ul id="toc-Younger_Dryas_impact_hypothesis-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Similar_events" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Similar_events"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.2</span> <span>Similar events</span> </div> </a> <ul id="toc-Similar_events-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-In_popular_culture" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#In_popular_culture"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>In popular culture</span> </div> </a> <ul id="toc-In_popular_culture-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label 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Available in 32 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-32" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">32 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%AF%D8%B1%D9%8A%D8%A7%D8%B3_%D8%A7%D9%84%D8%A3%D8%B5%D8%BA%D8%B1" title="درياس الأصغر – Arabic" lang="ar" hreflang="ar" data-title="درياس الأصغر" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/B%C3%B6y%C3%BCk_%C5%9Eaxta" title="Böyük Şaxta – Azerbaijani" lang="az" hreflang="az" data-title="Böyük Şaxta" data-language-autonym="Azərbaycanca" data-language-local-name="Azerbaijani" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Dryas_recent" title="Dryas recent – Catalan" lang="ca" hreflang="ca" data-title="Dryas recent" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Mlad%C5%A1%C3%AD_dryas" title="Mladší dryas – Czech" lang="cs" hreflang="cs" data-title="Mladší dryas" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Yngre_Dryas" title="Yngre Dryas – Danish" lang="da" hreflang="da" data-title="Yngre Dryas" data-language-autonym="Dansk" data-language-local-name="Danish" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/J%C3%BCngere_Dryaszeit" title="Jüngere Dryaszeit – German" lang="de" hreflang="de" data-title="Jüngere Dryaszeit" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Dryas_Reciente" title="Dryas Reciente – Spanish" lang="es" hreflang="es" data-title="Dryas Reciente" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%AF%D8%B1%DB%8C%D8%A7%D8%B3_%D8%AC%D9%88%D8%A7%D9%86" title="دریاس جوان – Persian" lang="fa" hreflang="fa" data-title="دریاس جوان" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Dryas_r%C3%A9cent" title="Dryas récent – French" lang="fr" hreflang="fr" data-title="Dryas récent" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Younger_Dryas" title="Younger Dryas – Galician" lang="gl" hreflang="gl" data-title="Younger Dryas" data-language-autonym="Galego" data-language-local-name="Galician" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%98%81%EA%B1%B0_%EB%93%9C%EB%9D%BC%EC%9D%B4%EC%95%84%EC%8A%A4" title="영거 드라이아스 – Korean" lang="ko" hreflang="ko" data-title="영거 드라이아스" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Dryas_Terkini" title="Dryas Terkini – Indonesian" lang="id" hreflang="id" data-title="Dryas Terkini" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Dryas_recente" title="Dryas recente – Italian" lang="it" hreflang="it" data-title="Dryas recente" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/Younger_Dryas" title="Younger Dryas – Hebrew" lang="he" hreflang="he" data-title="Younger Dryas" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-la mw-list-item"><a href="https://la.wikipedia.org/wiki/Dryas_recentior" title="Dryas recentior – Latin" lang="la" hreflang="la" data-title="Dryas recentior" data-language-autonym="Latina" data-language-local-name="Latin" class="interlanguage-link-target"><span>Latina</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Dryas_Muda" title="Dryas Muda – Malay" lang="ms" hreflang="ms" data-title="Dryas Muda" data-language-autonym="Bahasa Melayu" data-language-local-name="Malay" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Jonge_Dryas" title="Jonge Dryas – Dutch" lang="nl" hreflang="nl" data-title="Jonge Dryas" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%83%A4%E3%83%B3%E3%82%AC%E3%83%BC%E3%83%89%E3%83%AA%E3%82%A2%E3%82%B9" title="ヤンガードリアス – Japanese" lang="ja" hreflang="ja" data-title="ヤンガードリアス" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Yngre_dryas" title="Yngre dryas – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Yngre dryas" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Yngre_dryas" title="Yngre dryas – Norwegian Nynorsk" lang="nn" hreflang="nn" data-title="Yngre dryas" data-language-autonym="Norsk nynorsk" data-language-local-name="Norwegian Nynorsk" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-oc mw-list-item"><a href="https://oc.wikipedia.org/wiki/Dryas_recent" title="Dryas recent – Occitan" lang="oc" hreflang="oc" data-title="Dryas recent" data-language-autonym="Occitan" data-language-local-name="Occitan" class="interlanguage-link-target"><span>Occitan</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/M%C5%82odszy_dryas" title="Młodszy dryas – Polish" lang="pl" hreflang="pl" data-title="Młodszy dryas" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Dryas_recente" title="Dryas recente – Portuguese" lang="pt" hreflang="pt" data-title="Dryas recente" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Dryasul_Recent" title="Dryasul Recent – Romanian" lang="ro" hreflang="ro" data-title="Dryasul Recent" data-language-autonym="Română" data-language-local-name="Romanian" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9F%D0%BE%D0%B7%D0%B4%D0%BD%D0%B8%D0%B9_%D0%B4%D1%80%D0%B8%D0%B0%D1%81" title="Поздний дриас – Russian" lang="ru" hreflang="ru" data-title="Поздний дриас" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Younger_Dryas" title="Younger Dryas – Simple English" lang="en-simple" hreflang="en-simple" data-title="Younger Dryas" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Nuorempi_dryas" title="Nuorempi dryas – Finnish" lang="fi" hreflang="fi" data-title="Nuorempi dryas" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Yngre_dryas" title="Yngre dryas – Swedish" lang="sv" hreflang="sv" data-title="Yngre dryas" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Erken_Dryas_Devri" title="Erken Dryas Devri – Turkish" lang="tr" hreflang="tr" data-title="Erken Dryas Devri" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%9F%D1%96%D0%B7%D0%BD%D1%96%D0%B9_%D0%B4%D1%80%D1%96%D0%B0%D1%81" title="Пізній дріас – Ukrainian" lang="uk" hreflang="uk" data-title="Пізній дріас" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/%DA%88%D8%B1%DB%8C%D8%A7%D8%B3_%D8%AC%D9%88%D8%A7%DA%BA" title="ڈریاس جواں – Urdu" lang="ur" hreflang="ur" data-title="ڈریاس جواں" data-language-autonym="اردو" data-language-local-name="Urdu" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E6%96%B0%E4%BB%99%E5%A5%B3%E6%9C%A8%E6%9C%9F" title="新仙女木期 – Chinese" lang="zh" hreflang="zh" data-title="新仙女木期" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q944279#sitelinks-wikipedia" title="Edit interlanguage links" class="wbc-editpage">Edit links</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> 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Northern Hemisphere glacial cooling and SH warming</div> <p class="mw-empty-elt"> </p> <style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox" style="width:23em;"><tbody><tr><th colspan="2" class="infobox-above" style="padding:0.25em 0.33em 0.33em;line-height:1.2em;font-size:1.25em;background:lightgrey;">Younger Dryas</th></tr><tr><td colspan="2" class="infobox-subheader"><span class="noprint"><span style="display:inline-block;"></span><span style="display:inline-block;">0.0129 – 0.0117 <a href="/wiki/Year#SI_prefix_multipliers" title="Year">Ma</a></span> <span style="display:inline-block;"></span><div id="Timeline-row" style="margin: 4px auto 0; clear:both; width:220px; padding:0px; height:18px; overflow:visible; white-space:nowrap; border:1px #666; border-style:solid none; position:relative; z-index:0; font-size:97%;"> <div style="position:absolute; height:100%; left:0px; width:207.23076923077px; padding-left:5px; text-align:left; background-color:rgb(254,217,106); background-image: linear-gradient(to right, rgba(255,255,255,1), rgba(254,217,106,1) 15%, rgba(254,217,106,1));"><a href="/wiki/Precambrian" title="Precambrian">PreꞒ</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(127,160,86); left:37.636923076923px; width:18.073846153846px;"><a href="/wiki/Cambrian" title="Cambrian">Ꞓ</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(0,146,112); left:55.710769230769px; width:14.08px;"><a href="/wiki/Ordovician" title="Ordovician">O</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(179,225,182); left:69.790769230769px; width:8.3261538461539px;"><a href="/wiki/Silurian" title="Silurian">S</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(203,140,55); left:78.116923076923px; width:20.409230769231px;"><a href="/wiki/Devonian" title="Devonian">D</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(103,165,153); left:98.526153846154px; width:20.307692307692px;"><a href="/wiki/Carboniferous" title="Carboniferous">C</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(240,64,40); left:118.83384615385px; width:15.907015384615px;"><a href="/wiki/Permian" title="Permian">P</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(129,43,146); left:134.74086153846px; width:17.092984615385px;"><a href="/wiki/Triassic" title="Triassic">T</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(52,178,201); left:151.83384615385px; width:19.089230769231px;"><a href="/wiki/Jurassic" title="Jurassic">J</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(127,198,78); left:170.92307692308px; width:26.738461538462px;"><a href="/wiki/Cretaceous" title="Cretaceous">K</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(253,154,82); left:197.66153846154px; width:14.543692307692px;"><a href="/wiki/Paleogene" title="Paleogene">Pg</a></div> <div style="position:absolute; height:100%; text-align:center; background-color:rgb(255,230,25); left:212.20523076923px; width:6.9215384615385px;"><a href="/wiki/Neogene" title="Neogene">N</a></div> <div id="end-border" style="position:absolute; height:100%; background-color:#666; width:1px; left:219px"></div><div style="margin:0 auto; line-height:0; clear:both; width:220px; padding:0px; height:8px; overflow:visible; background-color:transparent; position:relative; top:-4px; z-index:100;"> <div style="position:absolute; left:219.99563384615px; font-size:50%"><div style="position:relative; left:-0.42em">&#8595;</div></div> </div> </div></span></td></tr><tr><td colspan="2" class="infobox-image"><span typeof="mw:File"><a href="/wiki/File:Partin_2015_YD_global_map.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/44/Partin_2015_YD_global_map.jpg/250px-Partin_2015_YD_global_map.jpg" decoding="async" width="250" height="273" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/44/Partin_2015_YD_global_map.jpg/375px-Partin_2015_YD_global_map.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/44/Partin_2015_YD_global_map.jpg/500px-Partin_2015_YD_global_map.jpg 2x" data-file-width="582" data-file-height="636" /></a></span><div class="infobox-caption">Significant cooling in the Northern Hemisphere took place during the Younger Dryas, but there was also warming in the Southern Hemisphere. <a href="/wiki/Precipitation" title="Precipitation">Precipitation</a> had substantially decreased (brown) or increased (green) in many areas across the globe. Altogether, this indicates large changes in <a href="/wiki/Thermohaline_circulation" title="Thermohaline circulation">thermohaline circulation</a> as the cause<sup id="cite_ref-Partin2015_1-0" class="reference"><a href="#cite_note-Partin2015-1"><span class="cite-bracket">&#91;</span>1<span class="cite-bracket">&#93;</span></a></sup></div></td></tr><tr><th colspan="2" class="infobox-header" style="background:#ededed;">Etymology</th></tr><tr><th scope="row" class="infobox-label" style="width:10em;">Alternate spelling(s)</th><td class="infobox-data">YD</td></tr><tr><th scope="row" class="infobox-label" style="width:10em;">Synonym(s)</th><td class="infobox-data"><b>Loch Lomond Stadial</b><br /> <b>Nahanagan Stadial</b><br /></td></tr><tr><th colspan="2" class="infobox-header" style="background:#ededed;">Usage information</th></tr><tr><th scope="row" class="infobox-label" style="width:10em;">Celestial body</th><td class="infobox-data"><a href="/wiki/Geological_history_of_Earth" title="Geological history of Earth">Earth</a></td></tr><tr><th colspan="2" class="infobox-header" style="background:#ededed;">Definition</th></tr><tr><th scope="row" class="infobox-label" style="width:10em;">Chronological unit</th><td class="infobox-data"><a href="/wiki/Magnetostratigraphy#Chron" title="Magnetostratigraphy">Chron</a></td></tr><tr><th scope="row" class="infobox-label" style="width:10em;">Stratigraphic unit</th><td class="infobox-data"><a href="/wiki/Chronozone" title="Chronozone">Chronozone</a></td></tr><tr><th colspan="2" class="infobox-header" style="background:#ededed;">Atmospheric and climatic data</th></tr><tr><th scope="row" class="infobox-label" style="width:10em;">Mean atmospheric <a href="/wiki/Carbon_dioxide" title="Carbon dioxide">CO<sub style="font-size: 80%;vertical-align: -0.35em">2</sub></a> content</th><td class="infobox-data">c. 240 <a href="/wiki/Parts_per_million" class="mw-redirect" title="Parts per million">ppm</a><br />(0.9 times pre-industrial)</td></tr><tr><th scope="row" class="infobox-label" style="width:10em;">Mean surface temperature</th><td class="infobox-data">c. 10.5&#160;°C<br />(3&#160;°C below pre-industrial)</td></tr></tbody></table> <p>The <b>Younger Dryas</b> (YD, Greenland Stadial GS-1)<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">&#91;</span>2<span class="cite-bracket">&#93;</span></a></sup> was a period in Earth's geologic history that occurred circa 12,900 to 11,700 years <a href="/wiki/Before_Present" title="Before Present">Before Present</a> (BP).<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">&#91;</span>3<span class="cite-bracket">&#93;</span></a></sup> It is primarily known for the sudden or "abrupt" cooling in the Northern Hemisphere, when the North <a href="/wiki/Atlantic_Ocean" title="Atlantic Ocean">Atlantic Ocean</a> cooled and annual air temperatures decreased by ~3&#160;°C (5.4&#160;°F) over <a href="/wiki/North_America" title="North America">North America</a>, 2–6&#160;°C (3.6–10.8&#160;°F) in Europe and up to 10&#160;°C (18&#160;°F) in <a href="/wiki/Greenland" title="Greenland">Greenland</a>, in a few decades.<sup id="cite_ref-Carlson2013_4-0" class="reference"><a href="#cite_note-Carlson2013-4"><span class="cite-bracket">&#91;</span>4<span class="cite-bracket">&#93;</span></a></sup> Cooling in Greenland was particularly rapid, taking place over just 3 years or less.<sup id="cite_ref-Partin2015_1-1" class="reference"><a href="#cite_note-Partin2015-1"><span class="cite-bracket">&#91;</span>1<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">&#91;</span>5<span class="cite-bracket">&#93;</span></a></sup> At the same time, the Southern Hemisphere experienced warming.<sup id="cite_ref-Carlson2013_4-1" class="reference"><a href="#cite_note-Carlson2013-4"><span class="cite-bracket">&#91;</span>4<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">&#91;</span>6<span class="cite-bracket">&#93;</span></a></sup> This period ended as rapidly as it began, with dramatic warming over ~50 years, which transitioned the Earth from the glacial <a href="/wiki/Pleistocene" title="Pleistocene">Pleistocene</a> epoch into the current <a href="/wiki/Holocene" title="Holocene">Holocene</a>.<sup id="cite_ref-Partin2015_1-2" class="reference"><a href="#cite_note-Partin2015-1"><span class="cite-bracket">&#91;</span>1<span class="cite-bracket">&#93;</span></a></sup> </p><p>The Younger Dryas onset was not fully synchronized; in the tropics, the cooling was spread out over several centuries, and the same was true of the early-Holocene warming.<sup id="cite_ref-Partin2015_1-3" class="reference"><a href="#cite_note-Partin2015-1"><span class="cite-bracket">&#91;</span>1<span class="cite-bracket">&#93;</span></a></sup> Even in the Northern Hemisphere, temperature change was highly seasonal, with much colder winters, cooler springs, yet no change or even slight warming during the summer.<sup id="cite_ref-Buizert2014_7-0" class="reference"><a href="#cite_note-Buizert2014-7"><span class="cite-bracket">&#91;</span>7<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Schenk2018_8-0" class="reference"><a href="#cite_note-Schenk2018-8"><span class="cite-bracket">&#91;</span>8<span class="cite-bracket">&#93;</span></a></sup> Substantial changes in <a href="/wiki/Precipitation" title="Precipitation">precipitation</a> also took place, with cooler areas experiencing substantially lower rainfall, while warmer areas received more of it.<sup id="cite_ref-Carlson2013_4-2" class="reference"><a href="#cite_note-Carlson2013-4"><span class="cite-bracket">&#91;</span>4<span class="cite-bracket">&#93;</span></a></sup> In the Northern Hemisphere, the length of the <a href="/wiki/Growing_season" title="Growing season">growing season</a> declined.<sup id="cite_ref-Schenk2018_8-1" class="reference"><a href="#cite_note-Schenk2018-8"><span class="cite-bracket">&#91;</span>8<span class="cite-bracket">&#93;</span></a></sup> Land ice cover experienced little net change,<sup id="cite_ref-Shakun2012_9-0" class="reference"><a href="#cite_note-Shakun2012-9"><span class="cite-bracket">&#91;</span>9<span class="cite-bracket">&#93;</span></a></sup> but <a href="/wiki/Sea_ice" title="Sea ice">sea ice</a> extent had increased, contributing to <a href="/wiki/Ice%E2%80%93albedo_feedback" title="Ice–albedo feedback">ice–albedo feedback</a>.<sup id="cite_ref-Carlson2013_4-3" class="reference"><a href="#cite_note-Carlson2013-4"><span class="cite-bracket">&#91;</span>4<span class="cite-bracket">&#93;</span></a></sup> This increase in albedo was the main reason for net global cooling of 0.6&#160;°C (1.1&#160;°F).<sup id="cite_ref-Carlson2013_4-4" class="reference"><a href="#cite_note-Carlson2013-4"><span class="cite-bracket">&#91;</span>4<span class="cite-bracket">&#93;</span></a></sup> </p><p>During the preceding period, the <a href="/wiki/B%C3%B8lling%E2%80%93Aller%C3%B8d_Interstadial" title="Bølling–Allerød Interstadial">Bølling–Allerød Interstadial</a>, rapid warming in the Northern Hemisphere<sup id="cite_ref-IPCC_AR6_WG1_CH5_10-0" class="reference"><a href="#cite_note-IPCC_AR6_WG1_CH5-10"><span class="cite-bracket">&#91;</span>10<span class="cite-bracket">&#93;</span></a></sup><sup class="reference nowrap"><span title="Page / location: 677">&#58;&#8202;677&#8202;</span></sup> was offset by the equivalent cooling in the Southern Hemisphere.<sup id="cite_ref-Obase2021_11-0" class="reference"><a href="#cite_note-Obase2021-11"><span class="cite-bracket">&#91;</span>11<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Shakun2012_9-1" class="reference"><a href="#cite_note-Shakun2012-9"><span class="cite-bracket">&#91;</span>9<span class="cite-bracket">&#93;</span></a></sup> This "polar seesaw" pattern is consistent with changes in <a href="/wiki/Thermohaline_circulation" title="Thermohaline circulation">thermohaline circulation</a> (particularly the <a href="/wiki/Atlantic_meridional_overturning_circulation" title="Atlantic meridional overturning circulation">Atlantic meridional overturning circulation</a> or AMOC), which greatly affects how much heat is able to go from the Southern Hemisphere to the North. The Southern Hemisphere cools and the Northern Hemisphere warms when the AMOC is strong, and the opposite happens when it is weak.<sup id="cite_ref-Obase2021_11-1" class="reference"><a href="#cite_note-Obase2021-11"><span class="cite-bracket">&#91;</span>11<span class="cite-bracket">&#93;</span></a></sup> The <a href="/wiki/Scientific_consensus" title="Scientific consensus">scientific consensus</a> is that severe AMOC weakening explains the climatic effects of the Younger Dryas.<sup id="cite_ref-IPCC_AR6_WG1_Ch.8_12-0" class="reference"><a href="#cite_note-IPCC_AR6_WG1_Ch.8-12"><span class="cite-bracket">&#91;</span>12<span class="cite-bracket">&#93;</span></a></sup><sup class="reference nowrap"><span title="Page: 1148">&#58;&#8202;1148&#8202;</span></sup> It also explains why the Holocene warming had proceeded so rapidly once the AMOC change was no longer counteracting the increase in <a href="/wiki/Carbon_dioxide" title="Carbon dioxide">carbon dioxide</a> levels.<sup id="cite_ref-Shakun2012_9-2" class="reference"><a href="#cite_note-Shakun2012-9"><span class="cite-bracket">&#91;</span>9<span class="cite-bracket">&#93;</span></a></sup> </p><p>AMOC weakening causing polar seesaw effects is also consistent with the accepted explanation for <a href="/wiki/Dansgaard%E2%80%93Oeschger_event" title="Dansgaard–Oeschger event">Dansgaard–Oeschger events</a>, with YD likely to have been the last and the strongest of these events.<sup id="cite_ref-Nye2014_13-0" class="reference"><a href="#cite_note-Nye2014-13"><span class="cite-bracket">&#91;</span>13<span class="cite-bracket">&#93;</span></a></sup> However, there is some debate over what caused the AMOC to become so weak in the first place. The hypothesis historically most supported by scientists was an interruption from an influx of fresh, cold water from North America's <a href="/wiki/Lake_Agassiz" title="Lake Agassiz">Lake Agassiz</a> into the Atlantic Ocean.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">&#91;</span>14<span class="cite-bracket">&#93;</span></a></sup> While there is evidence of meltwater travelling via the <a href="/wiki/Mackenzie_River" title="Mackenzie River">Mackenzie River</a>,<sup id="cite_ref-Süfke2022_15-0" class="reference"><a href="#cite_note-Süfke2022-15"><span class="cite-bracket">&#91;</span>15<span class="cite-bracket">&#93;</span></a></sup> this hypothesis may not be consistent with the lack of <a href="/wiki/Sea_level_rise" title="Sea level rise">sea level rise</a> during this period,<sup id="cite_ref-Abdul2016_16-0" class="reference"><a href="#cite_note-Abdul2016-16"><span class="cite-bracket">&#91;</span>16<span class="cite-bracket">&#93;</span></a></sup> so other theories have also emerged.<sup id="cite_ref-Broecker2010_17-0" class="reference"><a href="#cite_note-Broecker2010-17"><span class="cite-bracket">&#91;</span>17<span class="cite-bracket">&#93;</span></a></sup> An extraterrestrial impact into the <a href="/wiki/Laurentide_ice_sheet" title="Laurentide ice sheet">Laurentide ice sheet</a> (where it would have left no impact crater) was proposed as an explanation, but this <a href="/wiki/Younger_Dryas_impact_hypothesis" title="Younger Dryas impact hypothesis">hypothesis</a> has numerous issues and no support from mainstream science.<sup id="cite_ref-Gramling2021_18-0" class="reference"><a href="#cite_note-Gramling2021-18"><span class="cite-bracket">&#91;</span>18<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Holliday2023_19-0" class="reference"><a href="#cite_note-Holliday2023-19"><span class="cite-bracket">&#91;</span>19<span class="cite-bracket">&#93;</span></a></sup> A volcanic eruption as an initial trigger for cooling and sea ice growth has been proposed more recently,<sup id="cite_ref-Baldini2018_20-0" class="reference"><a href="#cite_note-Baldini2018-20"><span class="cite-bracket">&#91;</span>20<span class="cite-bracket">&#93;</span></a></sup> and the presence of anomalously high levels of volcanism immediately preceding the onset of the Younger Dryas has been confirmed in both ice cores<sup id="cite_ref-Abbott2021_21-0" class="reference"><a href="#cite_note-Abbott2021-21"><span class="cite-bracket">&#91;</span>21<span class="cite-bracket">&#93;</span></a></sup> and cave deposits.<sup id="cite_ref-Sun2020_22-0" class="reference"><a href="#cite_note-Sun2020-22"><span class="cite-bracket">&#91;</span>22<span class="cite-bracket">&#93;</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Etymology">Etymology</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Younger_Dryas&amp;action=edit&amp;section=1" title="Edit section: Etymology"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Dryas_Stadials.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8d/Dryas_Stadials.png/220px-Dryas_Stadials.png" decoding="async" width="220" height="88" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8d/Dryas_Stadials.png/330px-Dryas_Stadials.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8d/Dryas_Stadials.png/440px-Dryas_Stadials.png 2x" data-file-width="1250" data-file-height="500" /></a><figcaption>Dryas stadials</figcaption></figure> <p>The Younger Dryas is named after the <a href="/wiki/Alpine_climate" title="Alpine climate">alpine</a>–<a href="/wiki/Tundra" title="Tundra">tundra</a> wildflower <i><a href="/wiki/Dryas_octopetala" title="Dryas octopetala">Dryas octopetala</a></i>, because its <a href="/wiki/Fossil" title="Fossil">fossils</a> are abundant in the European (particularly <a href="/wiki/Scandinavian_Peninsula" title="Scandinavian Peninsula">Scandinavian</a>) sediments dating to this timeframe. The two earlier geologic time intervals where this flower was abundant in Europe are the <a href="/wiki/Oldest_Dryas" title="Oldest Dryas">Oldest Dryas</a> (approx. 18,500-14,000 BP) and <a href="/wiki/Older_Dryas" title="Older Dryas">Older Dryas</a> (~14,050–13,900 BP), respectively.<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">&#91;</span>23<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Shakun2012_9-3" class="reference"><a href="#cite_note-Shakun2012-9"><span class="cite-bracket">&#91;</span>9<span class="cite-bracket">&#93;</span></a></sup> On the contrary, <i>Dryas octopetala</i> was rare during the <a href="/wiki/B%C3%B8lling%E2%80%93Aller%C3%B8d_Interstadial" title="Bølling–Allerød Interstadial">Bølling–Allerød Interstadial</a>. Instead, European temperatures were warm enough to support trees in Scandinavia, as seen at the Bølling and Allerød sites in <a href="/wiki/Denmark" title="Denmark">Denmark</a>.<sup id="cite_ref-EGL2022_24-0" class="reference"><a href="#cite_note-EGL2022-24"><span class="cite-bracket">&#91;</span>24<span class="cite-bracket">&#93;</span></a></sup> </p><p>In <a href="/wiki/Ireland" title="Ireland">Ireland</a>, the Younger Dryas has also been known as the <b>Nahanagan Stadial</b>, and in Great Britain it has been called the <b>Loch Lomond Stadial</b>.<sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">&#91;</span>25<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">&#91;</span>26<span class="cite-bracket">&#93;</span></a></sup> In the <a href="/wiki/Greenland" title="Greenland">Greenland</a> Summit <a href="/wiki/Ice_core" title="Ice core">ice core</a> chronology, the Younger Dryas corresponds to Greenland Stadial 1 (GS-1). The preceding Allerød warm period (interstadial) is subdivided into three events: Greenland Interstadial-1c to 1a (GI-1c to GI-1a).<sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">&#91;</span>27<span class="cite-bracket">&#93;</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Climate">Climate</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Younger_Dryas&amp;action=edit&amp;section=2" title="Edit section: Climate"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Evolution_of_temperature_in_the_Post-Glacial_period_according_to_Greenland_ice_cores_(Younger_Dryas).jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Evolution_of_temperature_in_the_Post-Glacial_period_according_to_Greenland_ice_cores_%28Younger_Dryas%29.jpg/280px-Evolution_of_temperature_in_the_Post-Glacial_period_according_to_Greenland_ice_cores_%28Younger_Dryas%29.jpg" decoding="async" width="280" height="78" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/63/Evolution_of_temperature_in_the_Post-Glacial_period_according_to_Greenland_ice_cores_%28Younger_Dryas%29.jpg/420px-Evolution_of_temperature_in_the_Post-Glacial_period_according_to_Greenland_ice_cores_%28Younger_Dryas%29.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/63/Evolution_of_temperature_in_the_Post-Glacial_period_according_to_Greenland_ice_cores_%28Younger_Dryas%29.jpg/560px-Evolution_of_temperature_in_the_Post-Glacial_period_according_to_Greenland_ice_cores_%28Younger_Dryas%29.jpg 2x" data-file-width="1786" data-file-height="496" /></a><figcaption><a href="/wiki/Greenland_ice_cores" class="mw-redirect" title="Greenland ice cores">Greenland ice cores</a> since the <a href="/wiki/Last_Glacial_Maximum" title="Last Glacial Maximum">Last Glacial Maximum</a> show very low temperatures for the most part of the Younger Dryas, which then rise rapidly during the <a href="/wiki/Holocene" title="Holocene">Holocene</a> transition<sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span class="cite-bracket">&#91;</span>28<span class="cite-bracket">&#93;</span></a></sup></figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Younger_Dryas_and_Holocene_temperature_changes.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/61/Younger_Dryas_and_Holocene_temperature_changes.png/280px-Younger_Dryas_and_Holocene_temperature_changes.png" decoding="async" width="280" height="258" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/61/Younger_Dryas_and_Holocene_temperature_changes.png/420px-Younger_Dryas_and_Holocene_temperature_changes.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/61/Younger_Dryas_and_Holocene_temperature_changes.png/560px-Younger_Dryas_and_Holocene_temperature_changes.png 2x" data-file-width="1180" data-file-height="1089" /></a><figcaption>Temperature changes, determined as <a href="/wiki/Proxy_(climate)" title="Proxy (climate)">proxy temperatures</a>, taken from the central region of Greenland's ice sheet during the Late Pleistocene and beginning of the Holocene.</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:20191021_Temperature_from_20,000_to_10,000_years_ago_-_recovery_from_ice_age.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/20191021_Temperature_from_20%2C000_to_10%2C000_years_ago_-_recovery_from_ice_age.png/280px-20191021_Temperature_from_20%2C000_to_10%2C000_years_ago_-_recovery_from_ice_age.png" decoding="async" width="280" height="212" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/15/20191021_Temperature_from_20%2C000_to_10%2C000_years_ago_-_recovery_from_ice_age.png/420px-20191021_Temperature_from_20%2C000_to_10%2C000_years_ago_-_recovery_from_ice_age.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/15/20191021_Temperature_from_20%2C000_to_10%2C000_years_ago_-_recovery_from_ice_age.png/560px-20191021_Temperature_from_20%2C000_to_10%2C000_years_ago_-_recovery_from_ice_age.png 2x" data-file-width="2572" data-file-height="1948" /></a><figcaption>Temperatures in Antarctica, derived from EPICA Dome&#160;C Ice Core</figcaption></figure> <p>As with the other geologic periods, <a href="/wiki/Paleoclimate" class="mw-redirect" title="Paleoclimate">paleoclimate</a> during the Younger Dryas is reconstructed through <a href="/wiki/Proxy_(climate)" title="Proxy (climate)">proxy</a> data such as traces of <a href="/wiki/Pollen" title="Pollen">pollen</a>, <a href="/wiki/Ice_core" title="Ice core">ice cores</a> and layers of marine and lake <a href="/wiki/Sediment" title="Sediment">sediments</a>.<sup id="cite_ref-Yu1998_29-0" class="reference"><a href="#cite_note-Yu1998-29"><span class="cite-bracket">&#91;</span>29<span class="cite-bracket">&#93;</span></a></sup> Collectively, this evidence shows that significant cooling across the Northern Hemisphere began around 12,870 ± 30 years BP.<sup id="cite_ref-Cheng2020_30-0" class="reference"><a href="#cite_note-Cheng2020-30"><span class="cite-bracket">&#91;</span>30<span class="cite-bracket">&#93;</span></a></sup> It was particularly severe in <a href="/wiki/Greenland" title="Greenland">Greenland</a>, where temperatures declined by 4–10&#160;°C (7.2–18.0&#160;°F),<sup id="cite_ref-Buizert2014_7-1" class="reference"><a href="#cite_note-Buizert2014-7"><span class="cite-bracket">&#91;</span>7<span class="cite-bracket">&#93;</span></a></sup> in an abrupt fashion.<sup id="cite_ref-Alley2000_31-0" class="reference"><a href="#cite_note-Alley2000-31"><span class="cite-bracket">&#91;</span>31<span class="cite-bracket">&#93;</span></a></sup> Temperatures at the Greenland summit were up to 15&#160;°C (27&#160;°F) colder than at the start of the 21st century.<sup id="cite_ref-Alley2000_31-1" class="reference"><a href="#cite_note-Alley2000-31"><span class="cite-bracket">&#91;</span>31<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Severinghaus1998_32-0" class="reference"><a href="#cite_note-Severinghaus1998-32"><span class="cite-bracket">&#91;</span>32<span class="cite-bracket">&#93;</span></a></sup> </p><p>Strong cooling of around 2–6&#160;°C (3.6–10.8&#160;°F) had also taken place in Europe.<sup id="cite_ref-Carlson2013_4-5" class="reference"><a href="#cite_note-Carlson2013-4"><span class="cite-bracket">&#91;</span>4<span class="cite-bracket">&#93;</span></a></sup> Icefields and <a href="/wiki/Glacier" title="Glacier">glaciers</a> formed in upland areas of <a href="/wiki/Great_Britain" title="Great Britain">Great Britain</a>, while many lowland areas developed <a href="/wiki/Permafrost" title="Permafrost">permafrost</a>,<sup id="cite_ref-Sissons1979_33-0" class="reference"><a href="#cite_note-Sissons1979-33"><span class="cite-bracket">&#91;</span>33<span class="cite-bracket">&#93;</span></a></sup> implying a cooling of −5&#160;°C (23&#160;°F) and a mean annual temperature no higher than −1&#160;°C (30&#160;°F).<sup id="cite_ref-Severinghaus1998_32-1" class="reference"><a href="#cite_note-Severinghaus1998-32"><span class="cite-bracket">&#91;</span>32<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-34" class="reference"><a href="#cite_note-34"><span class="cite-bracket">&#91;</span>34<span class="cite-bracket">&#93;</span></a></sup> <a href="/wiki/North_America" title="North America">North America</a> also became colder, particularly in the eastern and central areas.<sup id="cite_ref-Yu1998_29-1" class="reference"><a href="#cite_note-Yu1998-29"><span class="cite-bracket">&#91;</span>29<span class="cite-bracket">&#93;</span></a></sup> While the <a href="/wiki/Pacific_Northwest" title="Pacific Northwest">Pacific Northwest</a> region cooled by 2–3&#160;°C (3.6–5.4&#160;°F), cooling in western North America was generally less intense.<sup id="cite_ref-35" class="reference"><a href="#cite_note-35"><span class="cite-bracket">&#91;</span>35<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-36" class="reference"><a href="#cite_note-36"><span class="cite-bracket">&#91;</span>36<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-37" class="reference"><a href="#cite_note-37"><span class="cite-bracket">&#91;</span>37<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-38" class="reference"><a href="#cite_note-38"><span class="cite-bracket">&#91;</span>38<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-39" class="reference"><a href="#cite_note-39"><span class="cite-bracket">&#91;</span>39<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Elias2013_40-0" class="reference"><a href="#cite_note-Elias2013-40"><span class="cite-bracket">&#91;</span>40<span class="cite-bracket">&#93;</span></a></sup> While the <a href="/wiki/Orca_Basin" title="Orca Basin">Orca Basin</a> in the <a href="/wiki/Gulf_of_Mexico" title="Gulf of Mexico">Gulf of Mexico</a> still experienced a drop in <a href="/wiki/Sea_surface_temperature" title="Sea surface temperature">sea surface temperature</a> of 2.4 ± 0.6°C,<sup id="cite_ref-41" class="reference"><a href="#cite_note-41"><span class="cite-bracket">&#91;</span>41<span class="cite-bracket">&#93;</span></a></sup> land areas closer to it, such as <a href="/wiki/Texas" title="Texas">Texas</a>, the <a href="/wiki/Grand_Canyon" title="Grand Canyon">Grand Canyon</a> area<sup id="cite_ref-42" class="reference"><a href="#cite_note-42"><span class="cite-bracket">&#91;</span>42<span class="cite-bracket">&#93;</span></a></sup> and <a href="/wiki/New_Mexico" title="New Mexico">New Mexico</a>, ultimately did not cool as much as the continental interior.<sup id="cite_ref-Meltzer2010_43-0" class="reference"><a href="#cite_note-Meltzer2010-43"><span class="cite-bracket">&#91;</span>43<span class="cite-bracket">&#93;</span></a></sup> <sup id="cite_ref-44" class="reference"><a href="#cite_note-44"><span class="cite-bracket">&#91;</span>44<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-45" class="reference"><a href="#cite_note-45"><span class="cite-bracket">&#91;</span>45<span class="cite-bracket">&#93;</span></a></sup> The <a href="/wiki/Southeastern_United_States" title="Southeastern United States">Southeastern United States</a> became warmer and wetter than before.<sup id="cite_ref-Griggs2017_46-0" class="reference"><a href="#cite_note-Griggs2017-46"><span class="cite-bracket">&#91;</span>46<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Meltzer2010_43-1" class="reference"><a href="#cite_note-Meltzer2010-43"><span class="cite-bracket">&#91;</span>43<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Elias2013_40-1" class="reference"><a href="#cite_note-Elias2013-40"><span class="cite-bracket">&#91;</span>40<span class="cite-bracket">&#93;</span></a></sup> There was warming in and around the <a href="/wiki/Caribbean_Sea" title="Caribbean Sea">Caribbean Sea</a>, and in <a href="/wiki/West_Africa" title="West Africa">West Africa</a>.<sup id="cite_ref-Carlson2013_4-6" class="reference"><a href="#cite_note-Carlson2013-4"><span class="cite-bracket">&#91;</span>4<span class="cite-bracket">&#93;</span></a></sup> </p><p>It was once believed that the Younger Dryas cooling started at around the same time across the Northern Hemisphere.<sup id="cite_ref-47" class="reference"><a href="#cite_note-47"><span class="cite-bracket">&#91;</span>47<span class="cite-bracket">&#93;</span></a></sup> However, <a href="/wiki/Varve" title="Varve">varve</a> (sedimentary rock) analysis carried out in 2015 suggested that the cooling proceeded in two stages: first along latitude 56–54°N, 12,900–13,100&#160;years ago, and then further north, 12,600–12,750&#160;years ago.<sup id="cite_ref-48" class="reference"><a href="#cite_note-48"><span class="cite-bracket">&#91;</span>48<span class="cite-bracket">&#93;</span></a></sup> Evidence from <a href="/wiki/Lake_Suigetsu" title="Lake Suigetsu">Lake Suigetsu</a> cores in <a href="/wiki/Japan" title="Japan">Japan</a> and the <a href="/wiki/Puerto_Princesa_Subterranean_River_National_Park" title="Puerto Princesa Subterranean River National Park">Puerto Princesa cave complex</a> in the <a href="/wiki/Philippines" title="Philippines">Philippines</a> shows that the onset of the Younger Dryas in East Asia was delayed by several hundred years relative to the North Atlantic.<sup id="cite_ref-Nakagawa2003_49-0" class="reference"><a href="#cite_note-Nakagawa2003-49"><span class="cite-bracket">&#91;</span>49<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Partin2015_1-4" class="reference"><a href="#cite_note-Partin2015-1"><span class="cite-bracket">&#91;</span>1<span class="cite-bracket">&#93;</span></a></sup> Further, the cooling was uniform throughout the year, but had a distinct seasonal pattern. In most places in the Northern Hemisphere, winters became much colder than before, but springs cooled by less, while there was either no temperature change or even slight warming during the summer.<sup id="cite_ref-Buizert2014_7-2" class="reference"><a href="#cite_note-Buizert2014-7"><span class="cite-bracket">&#91;</span>7<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Schenk2018_8-2" class="reference"><a href="#cite_note-Schenk2018-8"><span class="cite-bracket">&#91;</span>8<span class="cite-bracket">&#93;</span></a></sup> An exception appears to have taken place in what is now <a href="/wiki/Maine" title="Maine">Maine</a>, where winter temperatures remained stable, yet summer temperatures decreased by up to 7.5&#160;°C (13.5&#160;°F).<sup id="cite_ref-Dieffenbacher-Krall2016_50-0" class="reference"><a href="#cite_note-Dieffenbacher-Krall2016-50"><span class="cite-bracket">&#91;</span>50<span class="cite-bracket">&#93;</span></a></sup> </p><p>While the Northern Hemisphere cooled, considerable warming occurred in the Southern Hemisphere.<sup id="cite_ref-Partin2015_1-5" class="reference"><a href="#cite_note-Partin2015-1"><span class="cite-bracket">&#91;</span>1<span class="cite-bracket">&#93;</span></a></sup> Sea surface temperatures were warmer by 0.3–1.9&#160;°C (0.54–3.42&#160;°F), and <a href="/wiki/Antarctica" title="Antarctica">Antarctica</a>, <a href="/wiki/South_America" title="South America">South America</a> (south of <a href="/wiki/Venezuela" title="Venezuela">Venezuela</a>) and <a href="/wiki/New_Zealand" title="New Zealand">New Zealand</a> all experienced warming.<sup id="cite_ref-Carlson2013_4-7" class="reference"><a href="#cite_note-Carlson2013-4"><span class="cite-bracket">&#91;</span>4<span class="cite-bracket">&#93;</span></a></sup> The net temperature change was a relatively modest<sup id="cite_ref-51" class="reference"><a href="#cite_note-51"><span class="cite-bracket">&#91;</span>51<span class="cite-bracket">&#93;</span></a></sup> cooling of 0.6&#160;°C (1.1&#160;°F).<sup id="cite_ref-Carlson2013_4-8" class="reference"><a href="#cite_note-Carlson2013-4"><span class="cite-bracket">&#91;</span>4<span class="cite-bracket">&#93;</span></a></sup> Temperature changes of the Younger Dryas lasted 1,150–1,300&#160;years.<sup id="cite_ref-Bjorck2007a_52-0" class="reference"><a href="#cite_note-Bjorck2007a-52"><span class="cite-bracket">&#91;</span>52<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Bjorck1996_53-0" class="reference"><a href="#cite_note-Bjorck1996-53"><span class="cite-bracket">&#91;</span>53<span class="cite-bracket">&#93;</span></a></sup> According to the <a href="/wiki/International_Commission_on_Stratigraphy" title="International Commission on Stratigraphy">International Commission on Stratigraphy</a>, the Younger Dryas ended around 11,700&#160;years ago,<sup id="cite_ref-54" class="reference"><a href="#cite_note-54"><span class="cite-bracket">&#91;</span>54<span class="cite-bracket">&#93;</span></a></sup> although some research places it closer to 11,550&#160;years ago.<sup id="cite_ref-55" class="reference"><a href="#cite_note-55"><span class="cite-bracket">&#91;</span>55<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-56" class="reference"><a href="#cite_note-56"><span class="cite-bracket">&#91;</span>56<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-57" class="reference"><a href="#cite_note-57"><span class="cite-bracket">&#91;</span>57<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-58" class="reference"><a href="#cite_note-58"><span class="cite-bracket">&#91;</span>58<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-59" class="reference"><a href="#cite_note-59"><span class="cite-bracket">&#91;</span>59<span class="cite-bracket">&#93;</span></a></sup> </p><p>The end of Younger Dryas was also abrupt: in previously cooled areas, warming to previous levels took place over 50–60 years.<sup id="cite_ref-Alley1993_60-0" class="reference"><a href="#cite_note-Alley1993-60"><span class="cite-bracket">&#91;</span>60<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Partin2015_1-6" class="reference"><a href="#cite_note-Partin2015-1"><span class="cite-bracket">&#91;</span>1<span class="cite-bracket">&#93;</span></a></sup> The tropics experienced more gradual temperature recovery over several centuries;<sup id="cite_ref-Partin2015_1-7" class="reference"><a href="#cite_note-Partin2015-1"><span class="cite-bracket">&#91;</span>1<span class="cite-bracket">&#93;</span></a></sup> the exception was in tropical Atlantic areas such as <a href="/wiki/Costa_Rica" title="Costa Rica">Costa Rica</a>, where temperature change was similar to Greenland's.<sup id="cite_ref-61" class="reference"><a href="#cite_note-61"><span class="cite-bracket">&#91;</span>61<span class="cite-bracket">&#93;</span></a></sup> The <a href="/wiki/Holocene" title="Holocene">Holocene</a> warming then proceeded across the globe, following an increase in <a href="/wiki/Carbon_dioxide" title="Carbon dioxide">carbon dioxide</a> levels during the YD period<sup id="cite_ref-Shakun2012_9-4" class="reference"><a href="#cite_note-Shakun2012-9"><span class="cite-bracket">&#91;</span>9<span class="cite-bracket">&#93;</span></a></sup> (from ~210 ppm to ~275 ppm<sup id="cite_ref-62" class="reference"><a href="#cite_note-62"><span class="cite-bracket">&#91;</span>62<span class="cite-bracket">&#93;</span></a></sup>). </p> <div class="mw-heading mw-heading3"><h3 id="Ice_cover">Ice cover</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Younger_Dryas&amp;action=edit&amp;section=3" title="Edit section: Ice cover"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Younger Dryas cooling was often accompanied by <a href="/wiki/Glacier" title="Glacier">glacier</a> advance and lowering of the regional <a href="/wiki/Snow_line" title="Snow line">snow line</a>, with evidence found in areas such as Scandinavia,<sup id="cite_ref-Bjorck2007a_52-1" class="reference"><a href="#cite_note-Bjorck2007a-52"><span class="cite-bracket">&#91;</span>52<span class="cite-bracket">&#93;</span></a></sup> the <a href="/wiki/Swiss_Alps" title="Swiss Alps">Swiss Alps</a><sup id="cite_ref-Carlson2013_4-9" class="reference"><a href="#cite_note-Carlson2013-4"><span class="cite-bracket">&#91;</span>4<span class="cite-bracket">&#93;</span></a></sup> and the <a href="/wiki/Dinaric_Alps" title="Dinaric Alps">Dinaric Alps</a> in the <a href="/wiki/Balkans" title="Balkans">Balkans</a>,<sup id="cite_ref-63" class="reference"><a href="#cite_note-63"><span class="cite-bracket">&#91;</span>63<span class="cite-bracket">&#93;</span></a></sup> northern ranges of North America's <a href="/wiki/Rocky_Mountains" title="Rocky Mountains">Rocky Mountains</a>,<sup id="cite_ref-64" class="reference"><a href="#cite_note-64"><span class="cite-bracket">&#91;</span>64<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-65" class="reference"><a href="#cite_note-65"><span class="cite-bracket">&#91;</span>65<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-66" class="reference"><a href="#cite_note-66"><span class="cite-bracket">&#91;</span>66<span class="cite-bracket">&#93;</span></a></sup> <a href="/wiki/Two_Creeks_Buried_Forest_State_Natural_Area" title="Two Creeks Buried Forest State Natural Area">Two Creeks Buried Forest</a> in <a href="/wiki/Wisconsin" title="Wisconsin">Wisconsin</a> and western parts of the <a href="/wiki/New_York_State" class="mw-redirect" title="New York State">New York State</a>,<sup id="cite_ref-67" class="reference"><a href="#cite_note-67"><span class="cite-bracket">&#91;</span>67<span class="cite-bracket">&#93;</span></a></sup> and in the Pacific Northwest,<sup id="cite_ref-68" class="reference"><a href="#cite_note-68"><span class="cite-bracket">&#91;</span>68<span class="cite-bracket">&#93;</span></a></sup> including the <a href="/wiki/Cascade_Range" title="Cascade Range">Cascade Range</a>.<sup id="cite_ref-69" class="reference"><a href="#cite_note-69"><span class="cite-bracket">&#91;</span>69<span class="cite-bracket">&#93;</span></a></sup> The entire <a href="/wiki/Laurentide_ice_sheet" title="Laurentide ice sheet">Laurentide ice sheet</a> had advanced between west <a href="/wiki/Lake_Superior" title="Lake Superior">Lake Superior</a> and southeast <a href="/wiki/Quebec" title="Quebec">Quebec</a>, leaving behind a layer of rock debris (<a href="/wiki/Moraine" title="Moraine">moraine</a>) dated to this period.<sup id="cite_ref-70" class="reference"><a href="#cite_note-70"><span class="cite-bracket">&#91;</span>70<span class="cite-bracket">&#93;</span></a></sup> Southeastern Alaska appears to have escaped glaciation; speleothem calcite deposition continued in the region despite being retarded, indicating the absence of permafrost and glaciation.<sup id="cite_ref-71" class="reference"><a href="#cite_note-71"><span class="cite-bracket">&#91;</span>71<span class="cite-bracket">&#93;</span></a></sup> </p><p>On the other hand, the warming of the Southern Hemisphere led to ice loss in Antarctica, South America and New Zealand.<sup id="cite_ref-72" class="reference"><a href="#cite_note-72"><span class="cite-bracket">&#91;</span>72<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Carlson2013_4-10" class="reference"><a href="#cite_note-Carlson2013-4"><span class="cite-bracket">&#91;</span>4<span class="cite-bracket">&#93;</span></a></sup> Moreover, while Greenland as a whole had cooled, glaciers had only grown in the north of the island,<sup id="cite_ref-73" class="reference"><a href="#cite_note-73"><span class="cite-bracket">&#91;</span>73<span class="cite-bracket">&#93;</span></a></sup> and they had retreated from the rest of Greenland's coasts. This was likely driven by the strengthened <a href="/wiki/Irminger_Current" title="Irminger Current">Irminger Current</a>.<sup id="cite_ref-Rainsley2018_74-0" class="reference"><a href="#cite_note-Rainsley2018-74"><span class="cite-bracket">&#91;</span>74<span class="cite-bracket">&#93;</span></a></sup> The <a href="/wiki/Jabllanica" title="Jabllanica">Jabllanica</a> mountain range in the Balkans also experienced ice loss and glacial retreat: this was likely caused by the drop in annual precipitation, which would have otherwise frozen and helped to maintain the glaciers.<sup id="cite_ref-75" class="reference"><a href="#cite_note-75"><span class="cite-bracket">&#91;</span>75<span class="cite-bracket">&#93;</span></a></sup> Unlike now, the glaciers were still present in northern <a href="/wiki/Scotland" title="Scotland">Scotland</a>, but they had thinned during the Younger Dryas.<sup id="cite_ref-76" class="reference"><a href="#cite_note-76"><span class="cite-bracket">&#91;</span>76<span class="cite-bracket">&#93;</span></a></sup> </p><p>The amount of water contained within glaciers directly influences global sea levels - <a href="/wiki/Sea_level_rise" title="Sea level rise">sea level rise</a> occurs if the glaciers retreat, and it drops if glaciers grow. Altogether, there appears to have been little change in sea level throughout the Younger Dryas.<sup id="cite_ref-Shakun2012_9-5" class="reference"><a href="#cite_note-Shakun2012-9"><span class="cite-bracket">&#91;</span>9<span class="cite-bracket">&#93;</span></a></sup> This is in contrast to rapid increases before and after, such as the <a href="/wiki/Meltwater_Pulse_1A" class="mw-redirect" title="Meltwater Pulse 1A">Meltwater Pulse 1A</a>.<sup id="cite_ref-Shakun2012_9-6" class="reference"><a href="#cite_note-Shakun2012-9"><span class="cite-bracket">&#91;</span>9<span class="cite-bracket">&#93;</span></a></sup> On the coasts, glacier advance and retreat also affects <a href="/wiki/Relative_sea_level" title="Relative sea level">relative sea level</a>. Western <a href="/wiki/Norway" title="Norway">Norway</a> experienced a relative sea level rise of <style data-mw-deduplicate="TemplateStyles:r1154941027">.mw-parser-output .frac{white-space:nowrap}.mw-parser-output .frac .num,.mw-parser-output .frac .den{font-size:80%;line-height:0;vertical-align:super}.mw-parser-output .frac .den{vertical-align:sub}.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);clip-path:polygon(0px 0px,0px 0px,0px 0px);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}</style>10&#160;m (<span class="frac">32<span class="sr-only">+</span><span class="num">2</span>&#8260;<span class="den">3</span></span>&#160;ft) as the <a href="/wiki/Scandinavian_ice_sheet" class="mw-redirect" title="Scandinavian ice sheet">Scandinavian ice sheet</a> advanced.<sup id="cite_ref-77" class="reference"><a href="#cite_note-77"><span class="cite-bracket">&#91;</span>77<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Lohne2007_78-0" class="reference"><a href="#cite_note-Lohne2007-78"><span class="cite-bracket">&#91;</span>78<span class="cite-bracket">&#93;</span></a></sup> Notably, ice sheet advance in this area appears to have begun about 600 years before the global onset of the Younger Dryas.<sup id="cite_ref-Lohne2007_78-1" class="reference"><a href="#cite_note-Lohne2007-78"><span class="cite-bracket">&#91;</span>78<span class="cite-bracket">&#93;</span></a></sup> Underwater, the deposits of <a href="/wiki/Methane_clathrate" title="Methane clathrate">methane clathrate</a> - methane frozen into ice - remained stable throughout the Younger Dryas, including during the rapid warming as it ended.<sup id="cite_ref-79" class="reference"><a href="#cite_note-79"><span class="cite-bracket">&#91;</span>79<span class="cite-bracket">&#93;</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Weather_systems">Weather systems</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Younger_Dryas&amp;action=edit&amp;section=4" title="Edit section: Weather systems"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>As the Northern Hemisphere cooled and the Southern Hemisphere warmed, the <a href="/wiki/Thermal_equator" title="Thermal equator">thermal equator</a> would have shifted to the south. Because <a href="/wiki/Trade_winds" title="Trade winds">trade winds</a> from either hemisphere cancel each other out above the thermal equator in a calm, heavily clouded area known as the <a href="/wiki/Intertropical_Convergence_Zone" title="Intertropical Convergence Zone">Intertropical Convergence Zone</a> (ITCZ), a change in its position affects wind patterns elsewhere. For instance, in <a href="/wiki/East_Africa" title="East Africa">East Africa</a>, the sediments of <a href="/wiki/Lake_Tanganyika" title="Lake Tanganyika">Lake Tanganyika</a> were mixed less strongly during this period, indicating weaker wind systems in this area.<sup id="cite_ref-80" class="reference"><a href="#cite_note-80"><span class="cite-bracket">&#91;</span>80<span class="cite-bracket">&#93;</span></a></sup> Shifts in atmospheric patterns are believed to be the main reason why Northern Hemisphere summers generally did not cool during the Younger Dryas.<sup id="cite_ref-Schenk2018_8-3" class="reference"><a href="#cite_note-Schenk2018-8"><span class="cite-bracket">&#91;</span>8<span class="cite-bracket">&#93;</span></a></sup> </p><p>Since winds carry moisture in the form of clouds, these changes also affect <a href="/wiki/Precipitation" title="Precipitation">precipitation</a>. Thus, evidence from the pollen record shows that some areas have become very arid, including Scotland,<sup id="cite_ref-81" class="reference"><a href="#cite_note-81"><span class="cite-bracket">&#91;</span>81<span class="cite-bracket">&#93;</span></a></sup> the North American <a href="/wiki/Midwest" class="mw-redirect" title="Midwest">Midwest</a>, <sup id="cite_ref-82" class="reference"><a href="#cite_note-82"><span class="cite-bracket">&#91;</span>82<span class="cite-bracket">&#93;</span></a></sup> <a href="/wiki/Anatolia" title="Anatolia">Anatolia</a> and southern <a href="/wiki/China" title="China">China</a>.<sup id="cite_ref-83" class="reference"><a href="#cite_note-83"><span class="cite-bracket">&#91;</span>83<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-84" class="reference"><a href="#cite_note-84"><span class="cite-bracket">&#91;</span>84<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Hong2014_85-0" class="reference"><a href="#cite_note-Hong2014-85"><span class="cite-bracket">&#91;</span>85<span class="cite-bracket">&#93;</span></a></sup> As North Africa, including the <a href="/wiki/Sahara_Desert" class="mw-redirect" title="Sahara Desert">Sahara Desert</a>, became drier, the amount of dust blown by wind had also increased.<sup id="cite_ref-Carlson2013_4-11" class="reference"><a href="#cite_note-Carlson2013-4"><span class="cite-bracket">&#91;</span>4<span class="cite-bracket">&#93;</span></a></sup> Other areas became wetter including northern China<sup id="cite_ref-Hong2014_85-1" class="reference"><a href="#cite_note-Hong2014-85"><span class="cite-bracket">&#91;</span>85<span class="cite-bracket">&#93;</span></a></sup> (possibly excepting the <a href="/wiki/Shanxi" title="Shanxi">Shanxi</a> region)<sup id="cite_ref-86" class="reference"><a href="#cite_note-86"><span class="cite-bracket">&#91;</span>86<span class="cite-bracket">&#93;</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Biosphere">Biosphere</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Younger_Dryas&amp;action=edit&amp;section=5" title="Edit section: Biosphere"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Wei%C3%9Fe_Silberwurz_(Dryas_octopetala)_2.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/52/Wei%C3%9Fe_Silberwurz_%28Dryas_octopetala%29_2.jpg/220px-Wei%C3%9Fe_Silberwurz_%28Dryas_octopetala%29_2.jpg" decoding="async" width="220" height="147" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/52/Wei%C3%9Fe_Silberwurz_%28Dryas_octopetala%29_2.jpg/330px-Wei%C3%9Fe_Silberwurz_%28Dryas_octopetala%29_2.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/52/Wei%C3%9Fe_Silberwurz_%28Dryas_octopetala%29_2.jpg/440px-Wei%C3%9Fe_Silberwurz_%28Dryas_octopetala%29_2.jpg 2x" data-file-width="5184" data-file-height="3456" /></a><figcaption><i>Dryas octopetala</i> is the <a href="/wiki/Indicator_species" class="mw-redirect" title="Indicator species">indicator species</a> for the period</figcaption></figure> <p>The Younger Dryas was initially discovered around the start of the 20th century, through paleobotanical and lithostratigraphic studies of <a href="/wiki/Sweden" title="Sweden">Swedish</a> and <a href="/wiki/Denmark" title="Denmark">Danish</a> bog and lake sites, particularly the <a href="/wiki/Aller%C3%B8d_Municipality" title="Allerød Municipality">Allerød</a> clay pit in Denmark.<sup id="cite_ref-Mangerud2020_87-0" class="reference"><a href="#cite_note-Mangerud2020-87"><span class="cite-bracket">&#91;</span>87<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Bjorck1996_53-1" class="reference"><a href="#cite_note-Bjorck1996-53"><span class="cite-bracket">&#91;</span>53<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-88" class="reference"><a href="#cite_note-88"><span class="cite-bracket">&#91;</span>88<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-89" class="reference"><a href="#cite_note-89"><span class="cite-bracket">&#91;</span>89<span class="cite-bracket">&#93;</span></a></sup> The analysis of fossilized <a href="/wiki/Pollen" title="Pollen">pollen</a> had consistently shown how <i><a href="/wiki/Dryas_octopetala" title="Dryas octopetala">Dryas octopetala</a></i>, a plant which only thrives in glacial conditions, began to dominate where forests were able to grow during the preceding B-A Interstadial.<sup id="cite_ref-Mangerud2020_87-1" class="reference"><a href="#cite_note-Mangerud2020-87"><span class="cite-bracket">&#91;</span>87<span class="cite-bracket">&#93;</span></a></sup> This makes the Younger Dryas a key example of how <a href="/wiki/Biota_(ecology)" class="mw-redirect" title="Biota (ecology)">biota</a> responded to abrupt <a href="/wiki/Climate_change_(general_concept)" class="mw-redirect" title="Climate change (general concept)">climate change</a>.<sup id="cite_ref-90" class="reference"><a href="#cite_note-90"><span class="cite-bracket">&#91;</span>90<span class="cite-bracket">&#93;</span></a></sup> </p><p>For instance, in what is now <a href="/wiki/New_England" title="New England">New England</a>,<sup id="cite_ref-91" class="reference"><a href="#cite_note-91"><span class="cite-bracket">&#91;</span>91<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-92" class="reference"><a href="#cite_note-92"><span class="cite-bracket">&#91;</span>92<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-93" class="reference"><a href="#cite_note-93"><span class="cite-bracket">&#91;</span>93<span class="cite-bracket">&#93;</span></a></sup> cool summers, combined with cold winters and low precipitation, resulted in a treeless tundra up to the onset of the Holocene, when the <a href="/wiki/Taiga" title="Taiga">boreal forests</a> shifted north.<sup id="cite_ref-Dieffenbacher-Krall2016_50-1" class="reference"><a href="#cite_note-Dieffenbacher-Krall2016-50"><span class="cite-bracket">&#91;</span>50<span class="cite-bracket">&#93;</span></a></sup> Along the southern margins of the Great Lakes, spruce dropped rapidly, while pine increased, and herbaceous prairie vegetation decreased in abundance, but increased west of the region.<sup id="cite_ref-94" class="reference"><a href="#cite_note-94"><span class="cite-bracket">&#91;</span>94<span class="cite-bracket">&#93;</span></a></sup> The central <a href="/wiki/Appalachian_Mountains" title="Appalachian Mountains">Appalachian Mountains</a> remained forested during the Younger Dryas, but they were covered in <a href="/wiki/Spruce" title="Spruce">spruce</a> and <a href="/wiki/Larix_laricina" title="Larix laricina">tamarack</a> boreal forests, switching to <a href="/wiki/Temperate_broadleaf_and_mixed_forest" class="mw-redirect" title="Temperate broadleaf and mixed forest">temperate broadleaf and mixed forests</a> during the Holocene.<sup id="cite_ref-Liu2012_95-0" class="reference"><a href="#cite_note-Liu2012-95"><span class="cite-bracket">&#91;</span>95<span class="cite-bracket">&#93;</span></a></sup> Conversely, pollen and <a href="/wiki/Macrofossil" title="Macrofossil">macrofossil</a> evidence from near <a href="/wiki/Lake_Ontario" title="Lake Ontario">Lake Ontario</a> indicates that cool, boreal forests persisted into the early Holocene.<sup id="cite_ref-Griggs2017_46-1" class="reference"><a href="#cite_note-Griggs2017-46"><span class="cite-bracket">&#91;</span>46<span class="cite-bracket">&#93;</span></a></sup> </p><p>An increase of pine pollen indicates cooler winters within the central Cascades.<sup id="cite_ref-96" class="reference"><a href="#cite_note-96"><span class="cite-bracket">&#91;</span>96<span class="cite-bracket">&#93;</span></a></sup> <a href="/wiki/Speleothems" class="mw-redirect" title="Speleothems">Speleothems</a> from the <a href="/wiki/Oregon_Caves_National_Monument_and_Preserve" title="Oregon Caves National Monument and Preserve">Oregon Caves National Monument and Preserve</a> in southern <a href="/wiki/Oregon" title="Oregon">Oregon</a>'s <a href="/wiki/Klamath_Mountains" title="Klamath Mountains">Klamath Mountains</a> yield evidence of climatic cooling contemporaneous to the Younger Dryas.<sup id="cite_ref-Vacco2005_97-0" class="reference"><a href="#cite_note-Vacco2005-97"><span class="cite-bracket">&#91;</span>97<span class="cite-bracket">&#93;</span></a></sup> On the Olympic Peninsula, a mid-elevation site recorded a decrease in fire, but forest persisted and erosion increased during the Younger Dryas, which suggests cool and wet conditions.<sup id="cite_ref-98" class="reference"><a href="#cite_note-98"><span class="cite-bracket">&#91;</span>98<span class="cite-bracket">&#93;</span></a></sup> Speleothem records indicate an increase in precipitation in southern Oregon,<sup id="cite_ref-Vacco2005_97-1" class="reference"><a href="#cite_note-Vacco2005-97"><span class="cite-bracket">&#91;</span>97<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-99" class="reference"><a href="#cite_note-99"><span class="cite-bracket">&#91;</span>99<span class="cite-bracket">&#93;</span></a></sup> the timing of which coincides with increased sizes of <a href="/wiki/Pluvial_lake" title="Pluvial lake">pluvial lakes</a> in the northern Great Basin.<sup id="cite_ref-100" class="reference"><a href="#cite_note-100"><span class="cite-bracket">&#91;</span>100<span class="cite-bracket">&#93;</span></a></sup> Pollen record from the <a href="/wiki/Siskiyou_Mountains" title="Siskiyou Mountains">Siskiyou Mountains</a> suggests a lag in timing of the Younger Dryas, indicating a greater influence of warmer Pacific conditions on that range.<sup id="cite_ref-101" class="reference"><a href="#cite_note-101"><span class="cite-bracket">&#91;</span>101<span class="cite-bracket">&#93;</span></a></sup> </p><p>Effects in the <a href="/wiki/Rocky_Mountains" title="Rocky Mountains">Rocky Mountain</a> region were varied.<sup id="cite_ref-102" class="reference"><a href="#cite_note-102"><span class="cite-bracket">&#91;</span>102<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-103" class="reference"><a href="#cite_note-103"><span class="cite-bracket">&#91;</span>103<span class="cite-bracket">&#93;</span></a></sup> Several sites show little to no changes in vegetation.<sup id="cite_ref-Brunelle2003_104-0" class="reference"><a href="#cite_note-Brunelle2003-104"><span class="cite-bracket">&#91;</span>104<span class="cite-bracket">&#93;</span></a></sup> In the northern Rockies, a significant increase in pines and firs suggests warmer conditions than before and a shift to <a href="/wiki/Montane_ecosystems" title="Montane ecosystems">subalpine</a> parkland in places.<sup id="cite_ref-Mumma2012_105-0" class="reference"><a href="#cite_note-Mumma2012-105"><span class="cite-bracket">&#91;</span>105<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Brunelle2003_104-1" class="reference"><a href="#cite_note-Brunelle2003-104"><span class="cite-bracket">&#91;</span>104<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-106" class="reference"><a href="#cite_note-106"><span class="cite-bracket">&#91;</span>106<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-107" class="reference"><a href="#cite_note-107"><span class="cite-bracket">&#91;</span>107<span class="cite-bracket">&#93;</span></a></sup> That is hypothesized to be the result of a northward shift in the jet stream, combined with an increase in summer <a href="/wiki/Solar_irradiance" title="Solar irradiance">insolation</a><sup id="cite_ref-Mumma2012_105-1" class="reference"><a href="#cite_note-Mumma2012-105"><span class="cite-bracket">&#91;</span>105<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-108" class="reference"><a href="#cite_note-108"><span class="cite-bracket">&#91;</span>108<span class="cite-bracket">&#93;</span></a></sup> as well as a winter snow pack that was higher than today, with prolonged and wetter spring seasons.<sup id="cite_ref-109" class="reference"><a href="#cite_note-109"><span class="cite-bracket">&#91;</span>109<span class="cite-bracket">&#93;</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Human_societies">Human societies</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Younger_Dryas&amp;action=edit&amp;section=6" title="Edit section: Human societies"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The Younger Dryas is often linked to the <a href="/wiki/Neolithic_Revolution" title="Neolithic Revolution">Neolithic Revolution</a>, with the adoption of agriculture in the <a href="/wiki/Levant" title="Levant">Levant</a>.<sup id="cite_ref-Bar-Yosef_110-0" class="reference"><a href="#cite_note-Bar-Yosef-110"><span class="cite-bracket">&#91;</span>110<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-111" class="reference"><a href="#cite_note-111"><span class="cite-bracket">&#91;</span>111<span class="cite-bracket">&#93;</span></a></sup> The cold and dry Younger Dryas arguably lowered the <a href="/wiki/Carrying_capacity" title="Carrying capacity">carrying capacity</a> of the area and forced the sedentary early <a href="/wiki/Natufian" class="mw-redirect" title="Natufian">Natufian</a> population into a more mobile subsistence pattern.<sup id="cite_ref-112" class="reference"><a href="#cite_note-112"><span class="cite-bracket">&#91;</span>112<span class="cite-bracket">&#93;</span></a></sup> Further climatic deterioration is thought to have brought about <a href="/wiki/Cereal" title="Cereal">cereal</a> cultivation. While relative consensus exists regarding the role of the Younger Dryas in the changing subsistence patterns during the Natufian, its connection to the beginning of agriculture at the end of the period is still being debated.<sup id="cite_ref-Munro_113-0" class="reference"><a href="#cite_note-Munro-113"><span class="cite-bracket">&#91;</span>113<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-114" class="reference"><a href="#cite_note-114"><span class="cite-bracket">&#91;</span>114<span class="cite-bracket">&#93;</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Cause">Cause</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Younger_Dryas&amp;action=edit&amp;section=7" title="Edit section: Cause"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The scientific consensus links the Younger Dryas with a significant reduction or shutdown of the <a href="/wiki/Thermohaline_circulation" title="Thermohaline circulation">thermohaline circulation</a>, which circulates warm tropical waters northward through the <a href="/wiki/Atlantic_meridional_overturning_circulation" title="Atlantic meridional overturning circulation">Atlantic meridional overturning circulation</a> (AMOC).<sup id="cite_ref-Carlson2013_4-12" class="reference"><a href="#cite_note-Carlson2013-4"><span class="cite-bracket">&#91;</span>4<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-IPCC_AR6_WG1_Ch.8_12-1" class="reference"><a href="#cite_note-IPCC_AR6_WG1_Ch.8-12"><span class="cite-bracket">&#91;</span>12<span class="cite-bracket">&#93;</span></a></sup><sup class="reference nowrap"><span title="Page: 1148">&#58;&#8202;1148&#8202;</span></sup> This is consistent with <a href="/wiki/Climate_model" title="Climate model">climate model</a> simulations,<sup id="cite_ref-Partin2015_1-8" class="reference"><a href="#cite_note-Partin2015-1"><span class="cite-bracket">&#91;</span>1<span class="cite-bracket">&#93;</span></a></sup> as well as a range of proxy evidence, such as the decreased ventilation (exposure to oxygen from the surface) of the lowest layers of North Atlantic water. Cores from the western subtropical North Atlantic show that the "bottom water" lingered there for 1,000 years, twice the age of Late Holocene bottom waters from the same site around 1,500 BP.<sup id="cite_ref-115" class="reference"><a href="#cite_note-115"><span class="cite-bracket">&#91;</span>115<span class="cite-bracket">&#93;</span></a></sup> Further, the otherwise anomalous warming of the southeastern United States matches the hypothesis that as the AMOC weakened and transported less heat from the Caribbean towards Europe through the <a href="/wiki/North_Atlantic_Gyre" title="North Atlantic Gyre">North Atlantic Gyre</a>, more of it would stay trapped in the coastal waters.<sup id="cite_ref-116" class="reference"><a href="#cite_note-116"><span class="cite-bracket">&#91;</span>116<span class="cite-bracket">&#93;</span></a></sup> </p><p>It was originally hypothesized that the massive outburst from paleohistorical <a href="/wiki/Lake_Agassiz" title="Lake Agassiz">Lake Agassiz</a> had flooded the North Atlantic via the <a href="/wiki/Saint_Lawrence_Seaway" class="mw-redirect" title="Saint Lawrence Seaway">Saint Lawrence Seaway</a>, but little geological evidence had been found.<sup id="cite_ref-Broecker2006_117-0" class="reference"><a href="#cite_note-Broecker2006-117"><span class="cite-bracket">&#91;</span>117<span class="cite-bracket">&#93;</span></a></sup> For instance, the <a href="/wiki/Salinity" title="Salinity">salinity</a> in the Saint Lawrence Seaway did not decline, as would have been expected from massive quantities of meltwater.<sup id="cite_ref-Eisenman2009_118-0" class="reference"><a href="#cite_note-Eisenman2009-118"><span class="cite-bracket">&#91;</span>118<span class="cite-bracket">&#93;</span></a></sup> More recent research instead shows that floodwaters followed a pathway along the <a href="/wiki/Mackenzie_River" title="Mackenzie River">Mackenzie River</a> in present-day Canada,<sup id="cite_ref-119" class="reference"><a href="#cite_note-119"><span class="cite-bracket">&#91;</span>119<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-120" class="reference"><a href="#cite_note-120"><span class="cite-bracket">&#91;</span>120<span class="cite-bracket">&#93;</span></a></sup> and sediment cores show that the strongest outburst had occurred right before the onset of Younger Dryas.<sup id="cite_ref-Süfke2022_15-1" class="reference"><a href="#cite_note-Süfke2022-15"><span class="cite-bracket">&#91;</span>15<span class="cite-bracket">&#93;</span></a></sup> </p><p>Other factors are also likely to have played a major role in the Younger Dryas climate. For instance, some research suggests climate in Greenland was primarily affected by the melting of then-present <a href="/wiki/Fennoscandian_ice_sheet" class="mw-redirect" title="Fennoscandian ice sheet">Fennoscandian ice sheet</a>, which could explain why Greenland experienced the most abrupt climatic changes during the YD.<sup id="cite_ref-121" class="reference"><a href="#cite_note-121"><span class="cite-bracket">&#91;</span>121<span class="cite-bracket">&#93;</span></a></sup> Climate models also indicate that a single freshwater outburst, no matter how large, would not have been able to weaken the AMOC for over 1,000 years, as required by the Younger Dryas timeline, unless other factors were also involved.<sup id="cite_ref-Wang2018_122-0" class="reference"><a href="#cite_note-Wang2018-122"><span class="cite-bracket">&#91;</span>122<span class="cite-bracket">&#93;</span></a></sup> Some modelling explains this by showing that the melting of <a href="/wiki/Laurentide_Ice_Sheet" class="mw-redirect" title="Laurentide Ice Sheet">Laurentide Ice Sheet</a> led to greater rainfall over the Atlantic Ocean, freshening it and so helping to weaken the AMOC.<sup id="cite_ref-Eisenman2009_118-1" class="reference"><a href="#cite_note-Eisenman2009-118"><span class="cite-bracket">&#91;</span>118<span class="cite-bracket">&#93;</span></a></sup> Once the Younger Dryas began, lowered temperatures would have elevated snowfall across the Northern Hemisphere, increasing the <a href="/wiki/Ice-albedo_feedback" class="mw-redirect" title="Ice-albedo feedback">ice-albedo feedback</a>. Further, melting snow would be more likely to flood back into the North Atlantic than rainfall would, as less water would be absorbed into the frozen ground.<sup id="cite_ref-Wang2018_122-1" class="reference"><a href="#cite_note-Wang2018-122"><span class="cite-bracket">&#91;</span>122<span class="cite-bracket">&#93;</span></a></sup> Other modelling shows that <a href="/wiki/Sea_ice" title="Sea ice">sea ice</a> in the Arctic Ocean could have been tens of meters thick by the onset of the Younger Dryas, so that it would have been able to shed icebergs into the North Atlantic, which would have been able to weaken the circulation consistently.<sup id="cite_ref-123" class="reference"><a href="#cite_note-123"><span class="cite-bracket">&#91;</span>123<span class="cite-bracket">&#93;</span></a></sup> Notably, changes in sea ice cover would have had no impact on sea levels, which is consistent with the absence of significant sea level rise during the Younger Dryas, and particularly during its onset.<sup id="cite_ref-Abdul2016_16-1" class="reference"><a href="#cite_note-Abdul2016-16"><span class="cite-bracket">&#91;</span>16<span class="cite-bracket">&#93;</span></a></sup> </p><p>Some scientists also explain the lack of sea level rise during the Younger Dryas onset by connecting it with a volcanic eruption.<sup id="cite_ref-Baldini2018_20-1" class="reference"><a href="#cite_note-Baldini2018-20"><span class="cite-bracket">&#91;</span>20<span class="cite-bracket">&#93;</span></a></sup> Eruptions often deposit large quantities of <a href="/wiki/Sulfur_dioxide" title="Sulfur dioxide">sulfur dioxide</a> particles in the atmosphere, where they are known as <a href="/wiki/Aerosol" title="Aerosol">aerosols</a>, and can have a large cooling effect by reflecting sunlight. This phenomenon can also be caused by anthropogenic sulfur pollution, where it is known as <a href="/wiki/Global_dimming" title="Global dimming">global dimming</a>.<sup id="cite_ref-124" class="reference"><a href="#cite_note-124"><span class="cite-bracket">&#91;</span>124<span class="cite-bracket">&#93;</span></a></sup> Cooling from a high latitude volcanic eruption could have accelerated North Atlantic sea ice growth, finally tipping the AMOC sufficiently to cause the Younger Dryas.<sup id="cite_ref-Baldini2018_20-2" class="reference"><a href="#cite_note-Baldini2018-20"><span class="cite-bracket">&#91;</span>20<span class="cite-bracket">&#93;</span></a></sup> Cave deposits and glacial ice cores both contain evidence of at least one major volcanic eruption taking place in the northern hemisphere at a time close to Younger Dryas onset,<sup id="cite_ref-Sun2020_22-1" class="reference"><a href="#cite_note-Sun2020-22"><span class="cite-bracket">&#91;</span>22<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Abbott2021_21-1" class="reference"><a href="#cite_note-Abbott2021-21"><span class="cite-bracket">&#91;</span>21<span class="cite-bracket">&#93;</span></a></sup> perhaps even completely matching the stalagmite-derived date for the onset of the Younger Dryas event.<sup id="cite_ref-Cheng2020_30-1" class="reference"><a href="#cite_note-Cheng2020-30"><span class="cite-bracket">&#91;</span>30<span class="cite-bracket">&#93;</span></a></sup> It has been suggested that this eruption would have been stronger than any during the <a href="/wiki/Common_Era" title="Common Era">Common Era</a>, some of which have been able to cause several decades of cooling.<sup id="cite_ref-Abbott2021_21-2" class="reference"><a href="#cite_note-Abbott2021-21"><span class="cite-bracket">&#91;</span>21<span class="cite-bracket">&#93;</span></a></sup> </p><p>According to 1990s research, the <a href="/wiki/Laacher_See" title="Laacher See">Laacher See</a> eruption (present-day volcanic lake in <a href="/wiki/Rhineland-Palatinate" title="Rhineland-Palatinate">Rhineland-Palatinate</a>, <a href="/wiki/Germany" title="Germany">Germany</a>) would have matched the criteria,<sup id="cite_ref-125" class="reference"><a href="#cite_note-125"><span class="cite-bracket">&#91;</span>125<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-126" class="reference"><a href="#cite_note-126"><span class="cite-bracket">&#91;</span>126<span class="cite-bracket">&#93;</span></a></sup> but <a href="/wiki/Radiocarbon" class="mw-redirect" title="Radiocarbon">radiocarbon</a> dating done in 2021 pushes the date of the eruption back to 13,006 years BP, or over a century before the Younger Dryas began.<sup id="cite_ref-127" class="reference"><a href="#cite_note-127"><span class="cite-bracket">&#91;</span>127<span class="cite-bracket">&#93;</span></a></sup> This analysis was also challenged in 2023, with some researchers suggesting that the radiocarbon analysis was tainted by magmatic carbon dioxide.<sup id="cite_ref-Baldini2023_128-0" class="reference"><a href="#cite_note-Baldini2023-128"><span class="cite-bracket">&#91;</span>128<span class="cite-bracket">&#93;</span></a></sup> For now, the debate continues without a conclusive proof or rejection of the volcanic hypothesis.<sup id="cite_ref-Abbott2021_21-3" class="reference"><a href="#cite_note-Abbott2021-21"><span class="cite-bracket">&#91;</span>21<span class="cite-bracket">&#93;</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Younger_Dryas_impact_hypothesis">Younger Dryas impact hypothesis</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Younger_Dryas&amp;action=edit&amp;section=8" title="Edit section: Younger Dryas impact hypothesis"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The <a href="/wiki/Younger_Dryas_impact_hypothesis" title="Younger Dryas impact hypothesis">Younger Dryas impact hypothesis</a> (YDIH) attributes the cooling to the impact of a disintegrating comet or asteroid.<sup id="cite_ref-Powell2022_129-0" class="reference"><a href="#cite_note-Powell2022-129"><span class="cite-bracket">&#91;</span>129<span class="cite-bracket">&#93;</span></a></sup> Because there is no <a href="/wiki/Impact_crater" title="Impact crater">impact crater</a> dating to the Younger Dryas period, the proponents usually suggest the impact had struck the <a href="/wiki/Laurentide_ice_sheet" title="Laurentide ice sheet">Laurentide ice sheet</a>, so that the crater would have disappeared when the ice sheet melted during the Holocene,<sup id="cite_ref-Gramling2021_18-1" class="reference"><a href="#cite_note-Gramling2021-18"><span class="cite-bracket">&#91;</span>18<span class="cite-bracket">&#93;</span></a></sup> or that it was an airburst, which would only leave micro- and nanoparticles behind as evidence.<sup id="cite_ref-Powell2022_129-1" class="reference"><a href="#cite_note-Powell2022-129"><span class="cite-bracket">&#91;</span>129<span class="cite-bracket">&#93;</span></a></sup> Most experts reject the hypothesis, and argue that all of the microparticles are adequately explained by the terrestrial processes.<sup id="cite_ref-Holliday2023_19-1" class="reference"><a href="#cite_note-Holliday2023-19"><span class="cite-bracket">&#91;</span>19<span class="cite-bracket">&#93;</span></a></sup> For instance, mineral inclusions from YD-period sediments in Hall's Cave, Texas, have been interpreted by YDIH proponents as extraterrestrial in origin, but a paper published in 2020 argues that they are more likely to be volcanic.<sup id="cite_ref-Sun2020_22-2" class="reference"><a href="#cite_note-Sun2020-22"><span class="cite-bracket">&#91;</span>22<span class="cite-bracket">&#93;</span></a></sup> Opponents argue that there is no evidence for massive wildfires which would have been caused by an airburst of sufficient size to affect the thermohaline circulation,<sup id="cite_ref-Gramling2021_18-2" class="reference"><a href="#cite_note-Gramling2021-18"><span class="cite-bracket">&#91;</span>18<span class="cite-bracket">&#93;</span></a></sup> <a href="/wiki/Mineralogy" title="Mineralogy">mineralogical</a> and <a href="/wiki/Geochemistry" title="Geochemistry">geochemical</a> evidence<sup id="cite_ref-130" class="reference"><a href="#cite_note-130"><span class="cite-bracket">&#91;</span>130<span class="cite-bracket">&#93;</span></a></sup> or for simultaneous human population declines and mass animal extinctions which would have been required by this hypothesis.<sup id="cite_ref-Holliday2023_19-2" class="reference"><a href="#cite_note-Holliday2023-19"><span class="cite-bracket">&#91;</span>19<span class="cite-bracket">&#93;</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Similar_events">Similar events</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Younger_Dryas&amp;action=edit&amp;section=9" title="Edit section: Similar events"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:Ice-core-isotope.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/66/Ice-core-isotope.png/310px-Ice-core-isotope.png" decoding="async" width="310" height="217" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/66/Ice-core-isotope.png/465px-Ice-core-isotope.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/66/Ice-core-isotope.png/620px-Ice-core-isotope.png 2x" data-file-width="1250" data-file-height="875" /></a><figcaption>Temperature proxy from four ice cores for the last 140,000&#160;years. They show the distinct "sawtooth" pattern of the D-O events in the Northern Hemisphere, compared to the more muted changes in the Southern Hemisphere</figcaption></figure> <p>Statistical analysis shows that the Younger Dryas is merely the last of 25 or 26 <a href="/wiki/Dansgaard%E2%80%93Oeschger_event" title="Dansgaard–Oeschger event">Dansgaard–Oeschger events</a> (D–O events) over the past 120,000 years.<sup id="cite_ref-Nye2014_13-1" class="reference"><a href="#cite_note-Nye2014-13"><span class="cite-bracket">&#91;</span>13<span class="cite-bracket">&#93;</span></a></sup> These episodes are characterized by abrupt changes in the AMOC on timescales of decades or centuries.<sup id="cite_ref-131" class="reference"><a href="#cite_note-131"><span class="cite-bracket">&#91;</span>131<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-132" class="reference"><a href="#cite_note-132"><span class="cite-bracket">&#91;</span>132<span class="cite-bracket">&#93;</span></a></sup> The Younger Dryas is the best known and best understood because it is the most recent, but it is fundamentally similar to the previous cold phases over the past 120,000 years. This similarity makes the impact hypothesis very unlikely, and it may also contradict the Lake Agassiz hypothesis.<sup id="cite_ref-Nye2014_13-2" class="reference"><a href="#cite_note-Nye2014-13"><span class="cite-bracket">&#91;</span>13<span class="cite-bracket">&#93;</span></a></sup> On the other hand, some research links volcanism with D–O events, potentially supporting the volcanic hypothesis.<sup id="cite_ref-133" class="reference"><a href="#cite_note-133"><span class="cite-bracket">&#91;</span>133<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-134" class="reference"><a href="#cite_note-134"><span class="cite-bracket">&#91;</span>134<span class="cite-bracket">&#93;</span></a></sup> </p><p>Events similar to the Younger Dryas appear to have occurred during the other <a href="/wiki/Termination_(geomorphology)" title="Termination (geomorphology)">terminations</a> - a term used to describe a comparatively rapid transition from cold glacial conditions to warm interglacials.<sup id="cite_ref-Eglinton1992_135-0" class="reference"><a href="#cite_note-Eglinton1992-135"><span class="cite-bracket">&#91;</span>135<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Bardley2015_136-0" class="reference"><a href="#cite_note-Bardley2015-136"><span class="cite-bracket">&#91;</span>136<span class="cite-bracket">&#93;</span></a></sup><sup class="noprint Inline-Template" style="white-space:nowrap;">&#91;<i><a href="/wiki/Wikipedia:Citing_sources" title="Wikipedia:Citing sources"><span title="This citation requires a reference to the specific page or range of pages in which the material appears. (July 2021)">page&#160;needed</span></a></i>&#93;</sup> The analysis of lake and marine sediments can reconstruct past temperatures from the presence or absence of certain <a href="/wiki/Lipid" title="Lipid">lipids</a> and long chain <a href="/wiki/Alkenone" title="Alkenone">alkenones</a>, as these molecules are very sensitive to temperature.<sup id="cite_ref-Eglinton1992_135-1" class="reference"><a href="#cite_note-Eglinton1992-135"><span class="cite-bracket">&#91;</span>135<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-Bardley2015_136-1" class="reference"><a href="#cite_note-Bardley2015-136"><span class="cite-bracket">&#91;</span>136<span class="cite-bracket">&#93;</span></a></sup> This analysis provides evidence for YD-like events during Termination&#160;II (the end of the Marine Isotope Stage 6, ~130,000 years BP), III (the end of Marine Isotope Stage 8, ~243,000 years BP)<sup id="cite_ref-Chen2006_137-0" class="reference"><a href="#cite_note-Chen2006-137"><span class="cite-bracket">&#91;</span>137<span class="cite-bracket">&#93;</span></a></sup> and Termination&#160;IV (the end of Marine Isotope Stage 10, ~337,000 years BP.<sup id="cite_ref-138" class="reference"><a href="#cite_note-138"><span class="cite-bracket">&#91;</span>138<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-139" class="reference"><a href="#cite_note-139"><span class="cite-bracket">&#91;</span>139<span class="cite-bracket">&#93;</span></a></sup> When combined with additional evidence from ice cores and paleobotanical data, some have argued that YD-like events inevitably occur during every deglaciation.<sup id="cite_ref-Chen2006_137-1" class="reference"><a href="#cite_note-Chen2006-137"><span class="cite-bracket">&#91;</span>137<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-140" class="reference"><a href="#cite_note-140"><span class="cite-bracket">&#91;</span>140<span class="cite-bracket">&#93;</span></a></sup><sup id="cite_ref-141" class="reference"><a href="#cite_note-141"><span class="cite-bracket">&#91;</span>141<span class="cite-bracket">&#93;</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="In_popular_culture">In popular culture</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Younger_Dryas&amp;action=edit&amp;section=10" title="Edit section: In popular culture"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The 2004 film, <i><a href="/wiki/The_Day_After_Tomorrow" title="The Day After Tomorrow">The Day After Tomorrow</a></i> depicts catastrophic climatic effects following the disruption of the <a href="/wiki/Shutdown_of_thermohaline_circulation" class="mw-redirect" title="Shutdown of thermohaline circulation">North Atlantic Ocean circulation</a> that results in a series of <a href="/wiki/Extreme_weather" title="Extreme weather">extreme weather</a> events that create an <a href="/wiki/Abrupt_climate_change" title="Abrupt climate change">abrupt climate change</a> that leads to a new <a href="/wiki/Ice_age" title="Ice age">ice age</a>. <sup id="cite_ref-142" class="reference"><a href="#cite_note-142"><span class="cite-bracket">&#91;</span>142<span class="cite-bracket">&#93;</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Younger_Dryas&amp;action=edit&amp;section=11" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/8.2-kiloyear_event" title="8.2-kiloyear event">8.2&#160;kiloyear climate event</a>&#160;– Rapid global cooling about 8,200 years ago</li> <li><a href="/wiki/Blytt%E2%80%93Sernander_system" title="Blytt–Sernander system">Blytt–Sernander system</a>&#160;– Series of north European climatic periods</li> <li><a href="/wiki/Heinrich_event" title="Heinrich event">Heinrich event</a>&#160;– Large groups of icebergs traverse the North Atlantic.</li> <li><a href="/wiki/Little_Ice_Age" title="Little Ice Age">Little Ice Age</a>&#160;– Climatic cooling after the Medieval Warm Period (16th–19th centuries)</li> <li><a href="/wiki/Medieval_Warm_Period" title="Medieval Warm Period">Medieval Warm Period</a>&#160;– Period of warm climate in North Atlantic region lasting from about 950 CE to about 1250</li> <li><a href="/wiki/Milankovitch_cycles" title="Milankovitch cycles">Milankovitch cycles</a>&#160;– Global climate cycles</li> <li><a href="/wiki/Neoglaciation" title="Neoglaciation">Neoglaciation</a></li> <li><a href="/wiki/Preboreal_oscillation" title="Preboreal oscillation">Preboreal oscillation</a> – Cooling episode within the preboreal</li> <li><a href="/wiki/Timeline_of_environmental_history" title="Timeline of environmental history">Timeline of environmental history</a></li> <li><a href="/wiki/Timeline_of_glaciation" title="Timeline of glaciation">Timeline of glaciation</a>&#160;– Chronology of the major ice ages of the Earth</li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Younger_Dryas&amp;action=edit&amp;section=12" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist reflist-columns references-column-width" style="column-width: 22em;"> <ol class="references"> <li id="cite_note-Partin2015-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-Partin2015_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Partin2015_1-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-Partin2015_1-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-Partin2015_1-3"><sup><i><b>d</b></i></sup></a> <a href="#cite_ref-Partin2015_1-4"><sup><i><b>e</b></i></sup></a> <a href="#cite_ref-Partin2015_1-5"><sup><i><b>f</b></i></sup></a> <a href="#cite_ref-Partin2015_1-6"><sup><i><b>g</b></i></sup></a> <a href="#cite_ref-Partin2015_1-7"><sup><i><b>h</b></i></sup></a> <a href="#cite_ref-Partin2015_1-8"><sup><i><b>i</b></i></sup></a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFPartinQuinnShenOkumura2015" class="citation journal cs1">Partin, J.W.; Quinn, T.M.; Shen, C.-C.; Okumura, Y.; Cardenas, M.B.; Siringan, F.P.; Banner, J.L.; Lin, K.; Hu, H.-M.; Taylor, F.W. (2 September 2015). <a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4569703">"Gradual onset and recovery of the Younger Dryas abrupt climate event in the tropics"</a>. <i>Nature Communications</i>. <b>6</b>: 8061. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2015NatCo...6.8061P">2015NatCo...6.8061P</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1038%2Fncomms9061">10.1038/ncomms9061</a>. <a href="/wiki/PMC_(identifier)" class="mw-redirect" title="PMC (identifier)">PMC</a>&#160;<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4569703">4569703</a></span>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a>&#160;<a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/26329911">26329911</a>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=article&amp;rft.jtitle=Nature+Communications&amp;rft.atitle=Gradual+onset+and+recovery+of+the+Younger+Dryas+abrupt+climate+event+in+the+tropics&amp;rft.volume=6&amp;rft.pages=8061&amp;rft.date=2015-09-02&amp;rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC4569703%23id-name%3DPMC&amp;rft_id=info%3Apmid%2F26329911&amp;rft_id=info%3Adoi%2F10.1038%2Fncomms9061&amp;rft_id=info%3Abibcode%2F2015NatCo...6.8061P&amp;rft.aulast=Partin&amp;rft.aufirst=J.W.&amp;rft.au=Quinn%2C+T.M.&amp;rft.au=Shen%2C+C.-C.&amp;rft.au=Okumura%2C+Y.&amp;rft.au=Cardenas%2C+M.B.&amp;rft.au=Siringan%2C+F.P.&amp;rft.au=Banner%2C+J.L.&amp;rft.au=Lin%2C+K.&amp;rft.au=Hu%2C+H.-M.&amp;rft.au=Taylor%2C+F.W.&amp;rft_id=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC4569703&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AYounger+Dryas" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFJohnsonÖhrlingBergströmDreyer_Isaksson2022" class="citation journal cs1">Johnson, M.D.; Öhrling, C.; Bergström, A.; Dreyer Isaksson, O.; Pizarro Rajala, E. 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Retrieved <span class="nowrap">24 June</span> 2023</span>.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=unknown&amp;rft.jtitle=National+Geographic+News&amp;rft.atitle=Day+After+Tomorrow+Movie%3A+Could+Ice+Age+Occur+Overnight%3F&amp;rft.date=2004-05-18&amp;rft.aulast=Lovgren&amp;rft.aufirst=Stefan&amp;rft_id=http%3A%2F%2Fnews.nationalgeographic.com%2Fnews%2F2004%2F05%2F0518_040518_dayafter.html&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AYounger+Dryas" class="Z3988"></span></span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Younger_Dryas&amp;action=edit&amp;section=13" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation pressrelease cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20101217183132/http://oregonstate.edu/dept/ncs/newsarch/2007/Apr07/currents.html">"Study confirms mechanism for current shutdowns, European cooling"</a> (Press release). 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Archived from <a rel="nofollow" class="external text" href="http://ic.ucsc.edu/~acr/BeringResources/Articles%20of%20interest/Central%20Artic/Tarasov%20and%20Peltier%202005.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 21 August 2015.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=article&amp;rft.jtitle=Nature&amp;rft.atitle=Arctic+freshwater+forcing+of+the+Younger+Dryas+cold+reversal&amp;rft.volume=435&amp;rft.issue=7042&amp;rft.pages=662-665&amp;rft.date=2005-06&amp;rft_id=info%3Adoi%2F10.1038%2Fnature03617&amp;rft_id=https%3A%2F%2Fapi.semanticscholar.org%2FCorpusID%3A4375841%23id-name%3DS2CID&amp;rft_id=info%3Apmid%2F15931219&amp;rft_id=info%3Abibcode%2F2005Natur.435..662T&amp;rft.au=Tarasov%2C+L.&amp;rft.au=Peltier%2C+W.R.&amp;rft_id=http%3A%2F%2Fic.ucsc.edu%2F~acr%2FBeringResources%2FArticles%2520of%2520interest%2FCentral%2520Artic%2FTarasov%2520and%2520Peltier%25202005.pdf&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AYounger+Dryas" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFAcosta2018" class="citation journal cs1">Acosta; et&#160;al. 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<i>Science News (sci-news.com)</i> (Press release). 2 July 2020.</cite><span title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&amp;rft.genre=unknown&amp;rft.btitle=Cometary+debris+may+have+destroyed+Paleolithic+settlement+12%2C800+years+ago&amp;rft.date=2020-07-02&amp;rft_id=http%3A%2F%2Fwww.sci-news.com%2Farchaeology%2Fcometary-debris-abu-hureyra-settlement-08596.html&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AYounger+Dryas" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation audio-visual cs1"><a rel="nofollow" class="external text" href="https://www.youtube.com/watch?v=95u2sk_lRoQ"><i>When the Earth suddenly stopped warming</i></a>. <i><a href="/wiki/PBS_Eons" class="mw-redirect" title="PBS Eons">PBS Eons</a></i> (short ed. vid.). 17 December 2020. <a rel="nofollow" class="external text" href="https://ghostarchive.org/varchive/youtube/20211211/95u2sk_lRoQ">Archived</a> 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glaciations"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Continental_glaciations" title="Special:EditPage/Template:Continental glaciations"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Continental_glaciations" style="font-size:114%;margin:0 4em">Continental glaciations</div></th></tr><tr><th scope="row" class="navbox-group" style="background:#bbeb85;;width:1%">General</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Post-glacial_rebound" title="Post-glacial rebound">Post-glacial rebound</a></li> <li><a href="/wiki/Glacial_lake_outburst_flood" title="Glacial lake outburst flood">Glacial lake outburst flood</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#bbeb85;;width:1%">Time periods</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Glacial_period" title="Glacial period">Glacial period</a></li> <li><a href="/wiki/Timeline_of_glaciation" title="Timeline of glaciation">Timeline of glaciation</a></li></ul> <ul><li><a href="/wiki/Quaternary_glaciation" title="Quaternary glaciation">Quaternary glaciation</a></li> <li><a href="/wiki/Illinoian_(stage)" title="Illinoian (stage)">Illinoian Stage</a></li> <li><a href="/wiki/Interglacial" title="Interglacial">Interglacial</a></li> <li><a href="/wiki/Stadial" class="mw-redirect" title="Stadial">Interstadial</a></li> <li><a href="/wiki/Penultimate_Glacial_Period" title="Penultimate Glacial Period">Penultimate Glacial Period</a></li> <li><a href="/wiki/Last_Glacial_Period" title="Last Glacial Period">Last Glacial Period</a></li> <li><a href="/wiki/Last_Glacial_Maximum" title="Last Glacial Maximum">Last Glacial Maximum</a></li> <li><a href="/wiki/Mousterian_Pluvial" title="Mousterian Pluvial">Mousterian Pluvial</a></li> <li><a href="/wiki/Holocene_glacial_retreat" title="Holocene glacial retreat">Holocene glacial retreat</a></li> <li><a href="/wiki/Oldest_Dryas" title="Oldest Dryas">Oldest Dryas</a></li> <li><a href="/wiki/Older_Dryas" title="Older Dryas">Older Dryas</a></li> <li><a href="/wiki/Pleistocene" title="Pleistocene">Pleistocene</a></li> <li><a href="/wiki/Pre-Illinoian" title="Pre-Illinoian">Pre-Illinoian Stage</a></li> <li><a href="/wiki/Quaternary_glaciation" title="Quaternary glaciation">Quaternary glaciation</a></li> <li><a href="/wiki/Sangamonian" title="Sangamonian">Sangamonian Stage</a></li> <li><a href="/wiki/Wisconsin_glaciation" title="Wisconsin glaciation">Wisconsin glaciation</a></li> <li><a href="/wiki/B%C3%B8lling%E2%80%93Aller%C3%B8d_warming" class="mw-redirect" title="Bølling–Allerød warming">Bølling–Allerød warming</a></li> <li><a href="/wiki/Late_Glacial_Interstadial" class="mw-redirect" title="Late Glacial Interstadial">Late Glacial Interstadial</a></li> <li><a href="/wiki/Huelmo%E2%80%93Mascardi_Cold_Reversal" title="Huelmo–Mascardi Cold Reversal">Huelmo–Mascardi Cold Reversal</a></li> <li><a class="mw-selflink selflink">Younger Dryas</a></li> <li><a href="/wiki/8.2_kiloyear_event" class="mw-redirect" title="8.2 kiloyear event">8.2 kiloyear event</a></li> <li><a href="/wiki/4.2_kiloyear_event" class="mw-redirect" title="4.2 kiloyear event">4.2 kiloyear event</a></li> <li><a href="/wiki/Piora_Oscillation" title="Piora Oscillation">Piora Oscillation</a></li> <li><a href="/wiki/Little_Ice_Age" title="Little Ice Age">Little Ice Age</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#bbeb85;;width:1%"><a href="/wiki/Glacial_landform" title="Glacial landform">Landforms</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%;background:#bbeb85;">Erosional</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Fjord" title="Fjord">Fjord</a></li> <li><a href="/wiki/Glacial_striation" title="Glacial striation">Glacial striae</a></li> <li><a href="/wiki/Roche_moutonn%C3%A9e" title="Roche moutonnée">Roche moutonnée</a></li> <li><a href="/wiki/Tunnel_valley" title="Tunnel valley">Tunnel valley</a></li> <li><a href="/wiki/U-shaped_valley" title="U-shaped valley">U-shaped valley</a></li> <li><a href="/wiki/Glacial_lake" title="Glacial lake">Glacial lake</a></li> <li><a href="/wiki/Proglacial_lake" title="Proglacial lake">Proglacial lake</a></li> <li><a href="/wiki/Subglacial_lake" title="Subglacial lake">Subglacial lake</a></li> <li><a href="/wiki/Supraglacial_lake" title="Supraglacial lake">Supraglacial lake</a></li> <li><a href="/wiki/Ribbon_lake" title="Ribbon lake">Ribbon lake</a></li> <li><a href="/wiki/List_of_prehistoric_lakes" title="List of prehistoric lakes">List of prehistoric lakes</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;background:#bbeb85;">Depositional</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Drumlin" title="Drumlin">Drumlin</a></li> <li><a href="/wiki/Glacial_erratic" title="Glacial erratic">Erratic block</a></li> <li><a href="/wiki/Moraine" title="Moraine">Moraine</a></li> <li><a href="/wiki/Pulju_Wilderness_Area" title="Pulju Wilderness Area">Pulju moraine</a></li> <li><a href="/wiki/Rogen_moraine" title="Rogen moraine">Rogen moraine</a></li> <li><a href="/wiki/Terminal_moraine" title="Terminal moraine">Terminal moraine</a></li> <li><a href="/wiki/Till_plain" title="Till plain">Till plain</a></li> <li><a href="/wiki/Veiki_moraine" title="Veiki moraine">Veiki moraine</a></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%;background:#bbeb85;">Glacifluvial</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Diluvium" title="Diluvium">Diluvium</a></li> <li><a href="/wiki/Esker" title="Esker">Esker</a></li> <li><a href="/wiki/Giant_current_ripples" title="Giant current ripples">Giant current ripples</a></li> <li><a href="/wiki/Kame" title="Kame">Kame</a></li> <li><a href="/wiki/Kame_delta" title="Kame delta">Kame delta</a></li> <li><a href="/wiki/Kettle_(landform)" title="Kettle (landform)">Kettle hole</a></li> <li><a href="/wiki/Outwash_fan" title="Outwash fan">Outwash fan</a></li> <li><a href="/wiki/Outwash_plain" title="Outwash plain">Sandur</a></li></ul> </div></td></tr></tbody></table><div> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="background:#bbeb85;;width:1%">North America</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Greenland_ice_sheet" title="Greenland ice sheet">Greenland ice sheet</a></li> <li><a href="/wiki/Canadian_Shield" title="Canadian Shield">Canadian Shield</a></li> <li><a href="/wiki/Cordilleran_ice_sheet" title="Cordilleran ice sheet">Cordilleran ice sheet</a></li> <li><a href="/wiki/Laurentide_ice_sheet" title="Laurentide ice sheet">Laurentide ice sheet</a></li></ul> <ul><li><a href="/wiki/Lake_Agassiz" title="Lake Agassiz">Lake Agassiz</a></li> <li><a href="/wiki/Lake_Chicago" title="Lake Chicago">Lake Chicago</a></li> <li><a href="/wiki/Lake_Tight" title="Lake Tight">Lake Tight</a></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%;background:#bbeb85;">Canada</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Arrowhead_Provincial_Park" title="Arrowhead Provincial Park">Arrowhead Provincial Park</a>, Ontario</li> <li><a href="/wiki/Big_Rock_(glacial_erratic)" class="mw-redirect" title="Big Rock (glacial erratic)">Big Rock (glacial erratic)</a>, Alberta</li> <li><a href="/wiki/Cypress_Hills_(Canada)" title="Cypress Hills (Canada)">Cypress Hills (Canada)</a>, Saskatchewan</li> <li><a href="/wiki/Eramosa_River" title="Eramosa River">Eramosa River</a>, Ontario</li> <li><a href="/wiki/Eskers_Provincial_Park" title="Eskers Provincial Park">Eskers Provincial Park</a>, British Columbia</li> <li><a href="/wiki/Foothills_Erratics_Train" title="Foothills Erratics Train">Foothills Erratics Train</a>, Alberta</li> <li><a href="/wiki/Lion%27s_Head_Provincial_Park" title="Lion&#39;s Head Provincial Park">Lion's Head Provincial Park</a>, Ontario</li> <li><a href="/wiki/Origin_of_the_Oak_Ridges_Moraine" title="Origin of the Oak Ridges Moraine">Origin of the Oak Ridges Moraine</a>, Ontario</li> <li><a href="/wiki/Ovayok_Territorial_Park" title="Ovayok Territorial Park">Ovayok Territorial Park</a>, Nunavut</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%;background:#bbeb85;">United<br />States</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Lake_Bonneville" title="Lake Bonneville">Lake Bonneville</a>, Utah</li> <li><a href="/wiki/Lake_Lahontan" title="Lake Lahontan">Lake Lahontan</a>, Nevada</li> <li><a href="/wiki/Lake_Missoula" class="mw-redirect" title="Lake Missoula">Lake Missoula</a>, Montana</li> <li><a href="/wiki/Glacial_Lake_Wisconsin" title="Glacial Lake Wisconsin">Glacial Lake Wisconsin</a>, Wisconsin</li></ul> <ul><li><a href="/wiki/Chippewa_Moraine_State_Recreation_Area" title="Chippewa Moraine State Recreation Area">Chippewa Moraine State Recreation Area</a>, Wisconsin</li> <li><a href="/wiki/Coteau_des_Prairies" title="Coteau des Prairies">Coteau des Prairies</a>, South Dakota</li> <li><a href="/wiki/Devil%27s_Lake_State_Park_(Wisconsin)" title="Devil&#39;s Lake State Park (Wisconsin)">Devil's Lake State Park</a>, Wisconsin</li> <li><a href="/wiki/Glacial_Lakes_State_Park" title="Glacial Lakes State Park">Glacial Lakes State Park</a>, Minnesota</li> <li><a href="/wiki/Glacial_history_of_Minnesota" title="Glacial history of Minnesota">Glacial history of Minnesota</a></li> <li><a href="/wiki/Horicon_Marsh" title="Horicon Marsh">Horicon Marsh State Wildlife Area</a>, Wisconsin</li> <li><a href="/wiki/Ice_Age_Floods_National_Geologic_Trail" title="Ice Age Floods National Geologic Trail">Ice Age Floods National Geologic Trail</a>, Idaho, Oregon and Washington</li> <li><a href="/wiki/Ice_Age_National_Scientific_Reserve" title="Ice Age National Scientific Reserve">Ice Age National Scientific Reserve</a>, Wisconsin</li> <li><a href="/wiki/Ice_Age_Trail" title="Ice Age Trail">Ice Age Trail</a>, Wisconsin</li> <li><a href="/wiki/Interstate_Park" title="Interstate Park">Interstate State Park</a>, Minnesota and Wisconsin</li> <li><a href="/wiki/Kelleys_Island,_Ohio" title="Kelleys Island, Ohio">Kelleys Island</a>, Ohio</li> <li><a href="/wiki/Teays_River" title="Teays River">Teays River</a>, Ohio</li> <li><a href="/wiki/Kettle_Moraine_State_Forest" title="Kettle Moraine State Forest">Kettle Moraine State Forest</a>, Wisconsin</li> <li><a href="/wiki/Mill_Bluff_State_Park" title="Mill Bluff State Park">Mill Bluff State Park</a>, Wisconsin</li> <li><a href="/wiki/Oneida_Lake" title="Oneida Lake">Oneida Lake</a>, New York</li> <li><a href="/wiki/Two_Creeks_Buried_Forest_State_Natural_Area" title="Two Creeks Buried Forest State Natural Area">Two Creeks Buried Forest State Natural Area</a>, Wisconsin</li> <li><a href="/wiki/Withrow_Moraine_and_Jameson_Lake_Drumlin_Field" title="Withrow Moraine and Jameson Lake Drumlin Field">Withrow Moraine and Jameson Lake Drumlin Field</a>, Washington</li> <li><a href="/wiki/Yosemite_National_Park" title="Yosemite National Park">Yosemite National Park</a>, California</li></ul> </div></td></tr></tbody></table><div> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#bbeb85;;width:1%">Eurasia</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Hardangerfjord" title="Hardangerfjord">Hardangerfjord</a></li> <li><a href="/wiki/Killary_Harbour" title="Killary Harbour">Killary Harbour</a></li> <li><a href="/wiki/Monte_Rosa" title="Monte Rosa">Monte Rosa</a></li> <li><a href="/wiki/Svalbard" title="Svalbard">Svalbard</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#bbeb85;;width:1%">Antarctica</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Antarctic_Glaciation" class="mw-redirect" title="Antarctic Glaciation">Antarctic Glaciation</a></li> <li><a href="/wiki/Antarctic_ice_sheet" title="Antarctic ice sheet">Antarctic ice sheet</a> (<a href="/wiki/East_Antarctic_Ice_Sheet" title="East Antarctic Ice Sheet">East</a>, <a href="/wiki/West_Antarctic_Ice_Sheet" title="West Antarctic Ice Sheet">West</a>)</li> <li><a href="/wiki/Lambert_Glacier" title="Lambert Glacier">Lambert Glacier</a></li> <li><a href="/wiki/Ross_Ice_Shelf" title="Ross Ice Shelf">Ross Ice Shelf</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2" style="background:#bbeb85;"><div> <ul><li><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" 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mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Early_human_migrations" title="Template:Early human migrations"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Early_human_migrations" title="Template talk:Early human migrations"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Early_human_migrations" title="Special:EditPage/Template:Early human migrations"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Early_human_migrations" style="font-size:114%;margin:0 4em"><a href="/wiki/Early_human_migrations" title="Early human migrations">Early human migrations</a></div></th></tr><tr><td class="navbox-abovebelow" colspan="2"><div><a href="/wiki/Hominin" class="mw-redirect" title="Hominin">Hominin</a> and <i><a href="/wiki/Homo" title="Homo">Homo</a></i> dispersals</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Lower_Paleolithic" title="Lower Paleolithic">Lower Paleolithic</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"><div class="hlist inline"><ul><li><a href="/wiki/Early_expansions_of_hominins_out_of_Africa" title="Early expansions of hominins out of Africa">Out of Africa I</a></li><li><a href="/wiki/Neanderthal#Habitat_and_range" title="Neanderthal">Neanderthal range</a></li><li><a href="/wiki/Hominid_dispersals_in_Europe" title="Hominid dispersals in Europe">Europe</a></li><li><a href="/wiki/Archaic_humans_in_Southeast_Asia" title="Archaic humans in Southeast Asia">Southeast Asia</a> (<a href="/wiki/Migration_period_of_ancient_Burma" title="Migration period of ancient Burma">Burma</a></li><li><a href="/wiki/Models_of_migration_to_the_Philippines" title="Models of migration to the Philippines">Philippines</a>)</li></ul></div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Middle_Paleolithic" title="Middle Paleolithic">Middle Paleolithic</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"><div class="hlist inline"><ul><li><a href="/wiki/Early_human_migrations#Dispersal_throughout_Africa" title="Early human migrations">Africa</a></li><li><a href="/wiki/Recent_African_origin_of_modern_humans" title="Recent African origin of modern humans">Out of Africa II</a></li><li><a href="/wiki/Coastal_migration" class="mw-redirect" title="Coastal migration">Coastal migration</a></li><li><a href="/wiki/Archaic_human_admixture_with_modern_humans" class="mw-redirect" title="Archaic human admixture with modern humans">archaic admixture</a></li><li><a href="/wiki/Prehistory_of_Australia#Arrival" title="Prehistory of Australia">Australia</a></li><li><a href="/wiki/Migration_period_of_ancient_Burma" title="Migration period of ancient Burma">Burma</a></li><li><a href="/wiki/Models_of_migration_to_the_Philippines" title="Models of migration to the Philippines">Philippines</a></li><li><a href="/wiki/European_early_modern_humans" class="mw-redirect" title="European early modern humans">Europe</a></li></ul></div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Upper_Paleolithic" title="Upper Paleolithic">Upper Paleolithic</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"><div class="hlist inline"><ul><li><a href="/wiki/Last_Glacial_Maximum_refugia" title="Last Glacial Maximum refugia">LGM refugia</a></li><li><a href="/wiki/Mammoth_steppe" title="Mammoth steppe">Mammoth steppe</a></li><li><a href="/wiki/Ancient_Beringian" title="Ancient Beringian">Ancient Beringian</a></li><li><a href="/wiki/Peopling_of_the_Americas" title="Peopling of the Americas">Settlement of the Americas</a></li><li><a href="/wiki/Ancient_North_Eurasians" class="mw-redirect" title="Ancient North Eurasians">Ancient North Eurasians</a></li><li><a href="/wiki/Western_hunter-gatherer" title="Western hunter-gatherer">Western hunter-gatherers</a></li><li><a class="mw-selflink selflink">Younger Dryas</a></li><li><a href="/wiki/Migration_period_of_ancient_Burma" title="Migration period of ancient Burma">Burma</a></li><li><a href="/wiki/Models_of_migration_to_the_Philippines" title="Models of migration to the Philippines">Philippines</a></li></ul></div></div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox authority-control" aria-label="Navbox" style="padding:3px"><table class="nowraplinks hlist navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Help:Authority_control" title="Help:Authority control">Authority control databases</a>: National <span class="mw-valign-text-top noprint" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q944279#identifiers" title="Edit this at Wikidata"><img alt="Edit this at Wikidata" src="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"><ul><li><span class="uid"><a rel="nofollow" class="external text" href="https://d-nb.info/gnd/4511911-9">Germany</a></span></li></ul></div></td></tr></tbody></table></div> <!-- NewPP limit report Parsed by mw‐api‐int.codfw.main‐849f99967d‐7j7h9 Cached time: 20241123152859 Cache expiry: 2592000 Reduced expiry: false Complications: [vary‐revision‐sha1, show‐toc] CPU time usage: 2.078 seconds Real time usage: 2.396 seconds Preprocessor visited node count: 22817/1000000 Post‐expand include size: 473153/2097152 bytes Template argument 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