A 300 KYR Record of Upwelling Off Oman during the Late Quaternary: Evidence of the Asian Southwest Monsoon

<!doctype html> <html class="no-js" lang="en"> <head> <title>A 300 KYR Record of Upwelling Off Oman during the Late Quaternary: Evidence of the Asian Southwest Monsoon - ADS</title> <link rel="apple-touch-icon" sizes="180x180" href="//styles/favicon/apple-touch-icon.png"> <link rel="icon" type="image/png" sizes="32x32" href="//styles/favicon/favicon-32x32.png"> <link rel="icon" type="image/png" sizes="16x16" href="//styles/favicon/favicon-16x16.png"> <link rel="manifest" href="//styles/favicon/site.webmanifest"> <link rel="mask-icon" href="//styles/favicon/safari-pinned-tab.svg" color="#5bbad5"> <meta name="apple-mobile-web-app-title" content="ADS"> <meta name="application-name" content="ADS"> <meta name="msapplication-TileColor" content="#ffc40d"> <meta name="theme-color" content="#ffffff">  <script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start': new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0], j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src= 'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f); })(window,document,'script','dataLayer','GTM-NT2453N');</script> <link rel="stylesheet" href="/styles/css/styles.css"> <meta name="robots" content="noarchive"> <link rel="canonical" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=http://ui.adsabs.harvard.edu/abs/1993PalOc...8..193A/abstract"> <meta name="description" content="In the northwest Arabian Sea upwelling occurs each summer, driven by the strong SW monsoon winds. Upwelling results in high biological productivity and a distinctive assemblage of plankton species in the surface waters off Oman that are preserved in the sediments along the Oman continental margin, creating a geologic record of monsoon-driven upwelling. Sediments recovered from the Oman continental margin during Ocean Drilling Program leg 117 provide an opportunity to examine how upwelling has varied during the late Quaternary, spanning a longer interval than piston cores recovered prior to the ODP cruise. Variations in foraminifer shell accumulation and in the relative abundance of Globigerina bulloides indicate dominant cycles of variation at 1/100 kyr, the dominant frequency of glacial-interglacial variations, and at 1/23 kyr, the frequency of precessionally driven cycles in seasonal insolation. The strongest monsoon winds (indicated by increased upwelling) occurred during interglacial times when perihelion was aligned with the summer solstice, an orbital change that increased the insolation received during summer in the northern hemisphere. During glacial times upwelling was reduced, and although the precessional cycles were still present their amplitude was smaller. At both frequencies the upwelling cycles are in phase with minimum ice volume, evidence that glacial-interglacial climate changes also include changes to the climate system that influence the low-latitude monsoon. We attribute the decrease in the monsoon winds observed during glacial times to changes in bare land albedo over Asia and/or to changes in the areal extent and seasonal cycle in Asian snow cover that decrease the summer land-sea temperature contrast. Other mechanisms may also be involved. These new upwelling time series differ substantially from previous results, however the previous work relied on cores located farther offshore where upwelling is less intense and other physical mechanisms become important. Our results support the observations derived from atmospheric general circulation models of the atmosphere that indicate that both glacial boundary conditions, and the strength of summer insolation are important variables contributing to cycles in the monsoon winds during the late Quaternary."> <meta property="og:type" content="article"> <meta property="og:title" content="A 300 KYR Record of Upwelling Off Oman during the Late Quaternary: Evidence of the Asian Southwest Monsoon"> <meta property="og:site_name" content="ADS"> <meta property="og:description" content="In the northwest Arabian Sea upwelling occurs each summer, driven by the strong SW monsoon winds. Upwelling results in high biological productivity and a distinctive assemblage of plankton species in the surface waters off Oman that are preserved in the sediments along the Oman continental margin, creating a geologic record of monsoon-driven upwelling. Sediments recovered from the Oman continental margin during Ocean Drilling Program leg 117 provide an opportunity to examine how upwelling has varied during the late Quaternary, spanning a longer interval than piston cores recovered prior to the ODP cruise. Variations in foraminifer shell accumulation and in the relative abundance of Globigerina bulloides indicate dominant cycles of variation at 1/100 kyr, the dominant frequency of glacial-interglacial variations, and at 1/23 kyr, the frequency of precessionally driven cycles in seasonal insolation. The strongest monsoon winds (indicated by increased upwelling) occurred during interglacial times when perihelion was aligned with the summer solstice, an orbital change that increased the insolation received during summer in the northern hemisphere. During glacial times upwelling was reduced, and although the precessional cycles were still present their amplitude was smaller. At both frequencies the upwelling cycles are in phase with minimum ice volume, evidence that glacial-interglacial climate changes also include changes to the climate system that influence the low-latitude monsoon. We attribute the decrease in the monsoon winds observed during glacial times to changes in bare land albedo over Asia and/or to changes in the areal extent and seasonal cycle in Asian snow cover that decrease the summer land-sea temperature contrast. Other mechanisms may also be involved. These new upwelling time series differ substantially from previous results, however the previous work relied on cores located farther offshore where upwelling is less intense and other physical mechanisms become important. Our results support the observations derived from atmospheric general circulation models of the atmosphere that indicate that both glacial boundary conditions, and the strength of summer insolation are important variables contributing to cycles in the monsoon winds during the late Quaternary."> <meta property="og:url" content="https://ui.adsabs.harvard.edu/abs/1993PalOc...8..193A/abstract"> <meta property="og:image" content="https://ui.adsabs.harvard.edu/styles/img/transparent_logo.svg"> <meta property="article:published_time" content="04/1993"> <meta property="article:author" content="Anderson, David M."> <meta property="article:author" content="Prell, Warren L."> <meta name="citation_journal_title" content="Paleoceanography"> <meta name="citation_authors" content="Anderson, David M.;Prell, Warren L."> <meta name="citation_title" content="A 300 KYR Record of Upwelling Off Oman during the Late Quaternary: Evidence of the Asian Southwest Monsoon"> <meta name="citation_date" content="04/1993"> <meta name="citation_volume" content="8"> <meta name="citation_issue" content="2"> <meta name="citation_firstpage" content="193"> <meta name="citation_doi" content="10.1029/93PA00256"> <meta name="citation_issn" content="0883-8305"> <meta name="citation_language" content="en"> <meta name="citation_keywords" content="Marine Geology and Geophysics: Micropaleontology"> <meta name="citation_keywords" content="Oceanography: Biological and Chemical: Geochemistry"> <meta name="citation_keywords" content="Information Related to Geologic Time: Cenozoic"> <meta name="citation_keywords" content="Information Related to Geographic Region: Indian Ocean"> <meta name="citation_abstract_html_url" content="https://ui.adsabs.harvard.edu/abs/1993PalOc...8..193A/abstract"> <meta name="citation_publication_date" content="04/1993"> <meta name="citation_lastpage" content="208"> <link title="schema(PRISM)" rel="schema.prism" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=http://prismstandard.org/namespaces/1.2/basic/"> <meta name="prism.publicationDate" content="04/1993"> <meta name="prism.publicationName" content="PalOc"> <meta name="prism.issn" content="0883-8305"> <meta name="prism.volume" content="8"> <meta name="prism.startingPage" content="193"> <meta name="prism.endingPage" content="208"> <link title="schema(DC)" rel="schema.dc" href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=http://purl.org/dc/elements/1.1/"> <meta name="dc.identifier" content="doi:10.1029/93PA00256"> <meta name="dc.date" content="04/1993"> <meta name="dc.source" content="PalOc"> <meta name="dc.title" content="A 300 KYR Record of Upwelling Off Oman during the Late Quaternary: Evidence of the Asian Southwest Monsoon"> <meta name="dc.creator" content="Anderson, David M."> <meta name="dc.creator" content="Prell, Warren L."> <meta name="twitter:card" content="summary_large_image"> <meta name="twitter:description" content="In the northwest Arabian Sea upwelling occurs each summer, driven by the strong SW monsoon winds. Upwelling results in high biological productivity and a distinctive assemblage of plankton species in the surface waters off Oman that are preserved in the sediments along the Oman continental margin, creating a geologic record of monsoon-driven upwelling. Sediments recovered from the Oman continental margin during Ocean Drilling Program leg 117 provide an opportunity to examine how upwelling has varied during the late Quaternary, spanning a longer interval than piston cores recovered prior to the ODP cruise. Variations in foraminifer shell accumulation and in the relative abundance of Globigerina bulloides indicate dominant cycles of variation at 1/100 kyr, the dominant frequency of glacial-interglacial variations, and at 1/23 kyr, the frequency of precessionally driven cycles in seasonal insolation. The strongest monsoon winds (indicated by increased upwelling) occurred during interglacial times when perihelion was aligned with the summer solstice, an orbital change that increased the insolation received during summer in the northern hemisphere. During glacial times upwelling was reduced, and although the precessional cycles were still present their amplitude was smaller. At both frequencies the upwelling cycles are in phase with minimum ice volume, evidence that glacial-interglacial climate changes also include changes to the climate system that influence the low-latitude monsoon. We attribute the decrease in the monsoon winds observed during glacial times to changes in bare land albedo over Asia and/or to changes in the areal extent and seasonal cycle in Asian snow cover that decrease the summer land-sea temperature contrast. Other mechanisms may also be involved. These new upwelling time series differ substantially from previous results, however the previous work relied on cores located farther offshore where upwelling is less intense and other physical mechanisms become important. Our results support the observations derived from atmospheric general circulation models of the atmosphere that indicate that both glacial boundary conditions, and the strength of summer insolation are important variables contributing to cycles in the monsoon winds during the late Quaternary."> <meta name="twitter:title" content="A 300 KYR Record of Upwelling Off Oman during the Late Quaternary: Evidence of the Asian Southwest Monsoon"> <meta name="twitter:site" content="@adsabs"> <meta name="twitter:domain" content="ADS"> <meta name="twitter:image:src" content="https://ui.adsabs.harvard.edu/styles/img/transparent_logo.svg"> <meta name="twitter:creator" content="@adsabs"> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"><base href="/"> <style> .btn-full-ads { color: #fff !important; background-color: #1a1a1a !important; border-color: #1a1a1a !important; margin-top: 9px !important; padding-bottom: 10px !important; padding-top: 10px !important; 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<li class="author"><a href="https://ui-adsabs-harvard-edu.translate.goog/search/?q=author:%22Prell,+Warren+L.%22&_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB">Prell, Warren L.</a></li> </ul> </div> <div class="s-abstract-text"> <h4 class="sr-only">Abstract</h4> <p>In the northwest Arabian Sea upwelling occurs each summer, driven by the strong SW monsoon winds. Upwelling results in high biological productivity and a distinctive assemblage of plankton species in the surface waters off Oman that are preserved in the sediments along the Oman continental margin, creating a geologic record of monsoon-driven upwelling. Sediments recovered from the Oman continental margin during Ocean Drilling Program leg 117 provide an opportunity to examine how upwelling has varied during the late Quaternary, spanning a longer interval than piston cores recovered prior to the ODP cruise. Variations in foraminifer shell accumulation and in the relative abundance of Globigerina bulloides indicate dominant cycles of variation at 1/100 kyr, the dominant frequency of glacial-interglacial variations, and at 1/23 kyr, the frequency of precessionally driven cycles in seasonal insolation. The strongest monsoon winds (indicated by increased upwelling) occurred during interglacial times when perihelion was aligned with the summer solstice, an orbital change that increased the insolation received during summer in the northern hemisphere. During glacial times upwelling was reduced, and although the precessional cycles were still present their amplitude was smaller. At both frequencies the upwelling cycles are in phase with minimum ice volume, evidence that glacial-interglacial climate changes also include changes to the climate system that influence the low-latitude monsoon. We attribute the decrease in the monsoon winds observed during glacial times to changes in bare land albedo over Asia and/or to changes in the areal extent and seasonal cycle in Asian snow cover that decrease the summer land-sea temperature contrast. Other mechanisms may also be involved. These new upwelling time series differ substantially from previous results, however the previous work relied on cores located farther offshore where upwelling is less intense and other physical mechanisms become important. Our results support the observations derived from atmospheric general circulation models of the atmosphere that indicate that both glacial boundary conditions, and the strength of summer insolation are important variables contributing to cycles in the monsoon winds during the late Quaternary.</p> </div><br> <dl class="s-abstract-dl-horizontal"> <dt> Publication: </dt> <dd> <div id="article-publication"> Paleoceanography </div> </dd> <dt> Pub Date: </dt> <dd> April 1993 </dd> <dt> DOI: </dt> <dd> <p class="doi-p"><a href="https://ui-adsabs-harvard-edu.translate.goog/link_gateway/1993PalOc...8..193A/doi:10.1029/93PA00256?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" target="_blank" rel="noreferrer noopener">10.1029/93PA00256</a> <i class="fa fa-external-link"></i></p> </dd> <dt> Bibcode: </dt> <dd><a href="https://ui-adsabs-harvard-edu.translate.goog/abs/1993PalOc...8..193A/abstract?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB"> 1993PalOc...8..193A </a> <i class="icon-help" title="The bibcode is assigned by the ADS as a unique identifier for the paper."></i> </dd> <dt> Keywords: </dt> <dd> <ul class="list-inline"> <li>Marine Geology and Geophysics: Micropaleontology;</li> <li>Oceanography: Biological and Chemical: Geochemistry;</li> <li>Information Related to Geologic Time: Cenozoic;</li> <li>Information Related to Geographic Region: Indian Ocean</li> </ul> </dd> </dl> </article> </div> <div data-widget="ShowCitations"></div> <div data-widget="ShowReferences"></div> <div data-widget="ShowCoreads"></div> <div data-widget="ShowSimilar"></div> <div data-widget="ShowTableofcontents"></div> <div data-widget="ShowGraphics"></div> <div data-widget="ShowExportcitation" data-origin="abstract"></div> <div data-widget="ShowMetrics" data-allow-redirect="false"></div> <div data-widget="MetaTagsWidget"></div> </div> </div> </div> <div class="s-right-col-container col-xs-12 col-sm-12 col-md-3 col-lg-2 s-right-column" id="right-col-container"> <div data-widget="ShowResources"> <div data-reactroot="" class="s-right-col-widget-container" style="padding: 10px"> <div> <div class="resources__container"> <div class="resources__full__list"> <div class="resources__header__row"><i class="fa fa-file-text-o" aria-hidden="true"> </i> <div class="resources__header__title"> full text sources </div> </div> <div class="resources__content"> <div class="resources__content__title"> Publisher </div> <div class="resources__content__links"><span> <div class="resources__content__link__separator"> | </div></span> <span> <a href="https://ui-adsabs-harvard-edu.translate.goog/link_gateway/1993PalOc...8..193A/PUB_HTML?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en-GB" rel="noopener" class="resources__content__link "> <i class="fa fa-file-text" aria-hidden="true"> </i> </a> </span> </div> </div> </div> </div> <div data-widget="ShowAssociated"> </div> </div> </div> </div> <div data-widget="ShowGraphicsSidebar"> </div> </div> </div> </div> </div> </div> </div> <div id="footer-container"> <div data-widget="FooterWidget"> <div class="footer s-footer"> <footer> <div class="__footer_wrapper"> <div class="__footer_brand"> 漏 The SAO Astrophysics Data System <div class="__footer_brand_extra"> <p><i class="fa fa-envelope"></i> adshelp[at]cfa.harvard.edu</p> <p>The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement <em>80NSSC21M0056</em></p> </div> <div class="__footer_brand_logos"> <div class="logo1"><a href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=http://www.si.edu" target="_blank" rel="noreferrer noopener"> <img id="smithsonian-logo" src="/styles/img/smithsonian-logo.svg" alt="Smithsonian logo"> </a> </div> <div class="logo2"><a href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=https://www.cfa.harvard.edu/" target="_blank" rel="noreferrer noopener"> <img src="/styles/img/cfa.png" alt="Harvard Center for Astrophysics logo" id="cfa-logo"> </a> </div> <div class="logo3"><a href="https://translate.google.com/website?sl=auto&tl=en&hl=en-GB&u=http://www.nasa.gov" target="_blank" rel="noreferrer noopener"> <img src="/styles/img/nasa-partner.svg" alt="NASA logo" id="nasa-logo"> </a> </div> </div> <div class="__footer_brand_disclaimer"> *The material contained in this document is based upon work supported by a National Aeronautics and Space Administration (NASA) grant or cooperative agreement. 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A 300 KYR Record of Upwelling Off Oman during the Late Quaternary: Evidence of the Asian Southwest Monsoon - ADS