North American cooling signature of strong stratospheric wave events depends on the QBO phase

<!DOCTYPE html> <html lang="en" class="no-js"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes"> <div class="react-head-temp"> <title>North American cooling signature of strong stratospheric wave events depends on the QBO phase</title> <meta id="meta-title" property="citation_title" content="North American cooling signature of strong stratospheric wave events depends on the QBO phase"/> <meta id="og-title" property="og:title" content="North American cooling signature of strong stratospheric wave events depends on the QBO phase"/> <meta name="twitter:widgets:autoload" content="off"/> <meta name="twitter:dnt" content="on"/> <meta name="twitter:widgets:csp" content="on"/> <meta name="google-site-verification" content="lQbRRf0vgPqMbnbCsgELjAjIIyJjiIWo917M7hBshvI"/> <meta id="meta-abstract" name="citation_abstract" content="Abstract: Extreme stratospheric wave activity has been linked to surface cold extremes over North America, but little is known whether the Quasi-biennial Oscillation (QBO) plays a role in this linkage. Here, by comparing strong stratospheric wave events during the westerly phase (wQBO) with those during the easterly phase (eQBO), we show that the cooling signature following strong wave events depends on the QBO phase in observations. During wQBO, strong wave events are followed by an increased risk of North American cold extremes and a vertical structure shift from a westward phase tilt to an eastward tilt. However, strong wave events under eQBO do not change the cold risk nor alter the vertical tilt. We further examine this dependence on QBO in QBO-resolving climate models, finding that the cooling signature of strong wave events in models is largely insensitive to QBO phases. This insensitivity is suggested to be linked to model biases in the stratospheric wave representation."/> <meta id="meta-description" name="description" content="Author(s): Ding, Xiuyuan; Chen, Gang; Magnusdottir, Gudrun | Abstract: Abstract: Extreme stratospheric wave activity has been linked to surface cold extremes over North America, but little is known whether the Quasi-biennial Oscillation (QBO) plays a role in this linkage. Here, by comparing strong stratospheric wave events during the westerly phase (wQBO) with those during the easterly phase (eQBO), we show that the cooling signature following strong wave events depends on the QBO phase in observations. During wQBO, strong wave events are followed by an increased risk of North American cold extremes and a vertical structure shift from a westward phase tilt to an eastward tilt. However, strong wave events under eQBO do not change the cold risk nor alter the vertical tilt. We further examine this dependence on QBO in QBO-resolving climate models, finding that the cooling signature of strong wave events in models is largely insensitive to QBO phases. This insensitivity is suggested to be linked to model biases in the stratospheric wave representation."/> <meta id="og-description" name="og:description" content="Author(s): Ding, Xiuyuan; Chen, Gang; Magnusdottir, Gudrun | Abstract: Abstract: Extreme stratospheric wave activity has been linked to surface cold extremes over North America, but little is known whether the Quasi-biennial Oscillation (QBO) plays a role in this linkage. Here, by comparing strong stratospheric wave events during the westerly phase (wQBO) with those during the easterly phase (eQBO), we show that the cooling signature following strong wave events depends on the QBO phase in observations. During wQBO, strong wave events are followed by an increased risk of North American cold extremes and a vertical structure shift from a westward phase tilt to an eastward tilt. However, strong wave events under eQBO do not change the cold risk nor alter the vertical tilt. We further examine this dependence on QBO in QBO-resolving climate models, finding that the cooling signature of strong wave events in models is largely insensitive to QBO phases. This insensitivity is suggested to be linked to model biases in the stratospheric wave representation."/> <meta id="og-image" property="og:image" content="https://escholarship.org/images/escholarship-facebook2.jpg"/> <meta id="og-image-width" property="og:image:width" content="1242"/> <meta id="og-image-height" property="og:image:height" content="1242"/> <meta id="meta-author0" name="citation_author" content="Ding, Xiuyuan"/> <meta id="meta-author1" name="citation_author" content="Chen, Gang"/> <meta id="meta-author2" name="citation_author" content="Magnusdottir, Gudrun"/> <meta id="meta-publication_date" name="citation_publication_date" content="2024-06-04"/> <meta id="meta-doi" name="citation_doi" content="10.1088/2752-5295/ad53f6"/> <meta id="meta-online_date" name="citation_online_date" content="2024-06-19"/> <meta id="meta-pdf_url" name="citation_pdf_url" content="https://escholarship.org/content/qt7hj5s1js/qt7hj5s1js.pdf?t=sfbpcv"/> <link rel="canonical" href="https://escholarship.org/uc/item/7hj5s1js"/> </div> <link rel="stylesheet" href="/css/main-6e346ed4504727cd.css"> <link rel="resource" type="application/l10n" href="/node_modules/pdfjs-embed2/dist/locale/locale.properties"> <noscript><style> .jsonly { display: none } </style></noscript>   <script type="text/plain" data-type="application/javascript" data-name="matomo"> var _paq = window._paq = window._paq || []; 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</li><li><a href="/search/?q=author%3AChen%2C%20Gang">Chen, Gang</a>; </li><li class="c-authorlist__end"><a href="/search/?q=author%3AMagnusdottir%2C%20Gudrun">Magnusdottir, Gudrun</a> </li></ul></div><div class="c-pubinfo"><h2 class="c-pubinfo__location-heading">Published Web Location</h2><a href="https://doi.org/10.1088/2752-5295/ad53f6" class="c-pubinfo__link">https://doi.org/10.1088/2752-5295/ad53f6</a></div><div class="c-tabs"><div class="c-tabs__tabs"><button class="c-tabs__button-more" aria-label="Show all tabs">...</button><button class="c-tabs__button--active">Main Content</button><button class="c-tabs__button">Metrics</button><button class="c-tabs__button">Author & Article Info</button></div><div class="c-tabs__content"><div class="c-tabcontent"><a name="article_abstract"></a><details class="c-togglecontent" open=""><summary>Abstract</summary><div class="c-clientmarkup"><p>Abstract: Extreme stratospheric wave activity has been linked to surface cold extremes over North America, but little is known whether the Quasi-biennial Oscillation (QBO) plays a role in this linkage. Here, by comparing strong stratospheric wave events during the westerly phase (wQBO) with those during the easterly phase (eQBO), we show that the cooling signature following strong wave events depends on the QBO phase in observations. During wQBO, strong wave events are followed by an increased risk of North American cold extremes and a vertical structure shift from a westward phase tilt to an eastward tilt. However, strong wave events under eQBO do not change the cold risk nor alter the vertical tilt. We further examine this dependence on QBO in QBO-resolving climate models, finding that the cooling signature of strong wave events in models is largely insensitive to QBO phases. This insensitivity is suggested to be linked to model biases in the stratospheric wave representation.</p></div><p class="o-well-colored">Many UC-authored scholarly publications are freely available on this site because of the UC's <a href="https://osc.universityofcalifornia.edu/open-access-at-uc/open-access-policy/">open access policies</a>. <a href="https://help.escholarship.org/support/tickets/new">Let us know how this access is important for you.</a></p></details><details class="c-togglecontent" open=""><a name="article_main"></a><summary>Main Content</summary><div class="c-pdfview"><button class="c-pdfview__button-download">Download PDF to View</button><button class="c-pdfview__button-view">View Larger</button></div><div class="c-pdfview__accessibility">For improved accessibility of PDF content, <a href="/content/qt7hj5s1js/qt7hj5s1js.pdf?t=sfbpcv">download the file</a> to your device.</div><div class="c-pdfview__viewer"><div id="pdfjs-cdl-wrapper"> <div id="pdfjs-viewer" 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Introduction</a></li><li><a href="/uc/item/7hj5s1js">2. Data and methods</a></li><li><a href="/uc/item/7hj5s1js">3. Results</a></li><li><a href="/uc/item/7hj5s1js">4. Conclusions</a></li><li><a href="/uc/item/7hj5s1js">References</a></li></ul><ul class="c-jump__siblings"><li><a href="/uc/item/7hj5s1js">Metrics</a></li><li><a href="/uc/item/7hj5s1js">Author & Article Info</a></li></ul></div></section><div><section class="o-columnbox1"><header><h2>Related Items</h2></header><ul class="c-relateditems"><li><h3><a class="o-textlink__secondary" href="/uc/item/3p8455rk"><div class="c-clientmarkup">И? 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North American cooling signature of strong stratospheric wave events depends on the QBO phase