Drivers of the Recent Tropical Expansion in the Southern Hemisphere: Changing SSTs or Ozone Depletion?
Observational evidence indicates that the southern edge of the Hadley cell (HC) has shifted southward during austral summer in recent decades. However, there is no consensus on the cause of this shift, with several studies reaching opposite conclusions as to the relative role of changes in sea surfa...
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ftdatacite:10.7916/d87w6c2w 2023-05-15T13:57:48+02:00 Drivers of the Recent Tropical Expansion in the Southern Hemisphere: Changing SSTs or Ozone Depletion? Waugh, Darryn W. Garfinkel, Chaim I. Polvani, Lorenzo M. 2015 https://dx.doi.org/10.7916/d87w6c2w https://academiccommons.columbia.edu/doi/10.7916/D87W6C2W unknown Columbia University https://dx.doi.org/10.1175/jcli-d-15-0138.1 Atmospheric chemistry--Environmental aspects Ocean temperature Climatic changes Stratosphere Ozone layer depletion Atmospheric ozone Fluid dynamics Atmosphere Meteorology Text Articles article-journal ScholarlyArticle 2015 ftdatacite https://doi.org/10.7916/d87w6c2w https://doi.org/10.1175/jcli-d-15-0138.1 2021-11-05T12:55:41Z Observational evidence indicates that the southern edge of the Hadley cell (HC) has shifted southward during austral summer in recent decades. However, there is no consensus on the cause of this shift, with several studies reaching opposite conclusions as to the relative role of changes in sea surface temperatures (SSTs) and stratospheric ozone depletion in causing this shift. Here, the authors perform a meta-analysis of the extant literature on this subject and quantitatively compare the results of all published studies that have used single-forcing model integrations to isolate the role of different factors on the HC expansion during austral summer. It is shown that the weight of the evidence clearly points to stratospheric ozone depletion as the dominant driver of the tropical summertime expansion over the period in which an ozone hole was formed (1979 to late 1990s), although SST trends have contributed to trends since then. Studies that have claimed SSTs as the major driver of tropical expansion since 1979 have used prescribed ozone fields that underrepresent the observed Antarctic ozone depletion. Text Antarc* Antarctic DataCite Metadata Store (German National Library of Science and Technology) Antarctic Austral |
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DataCite Metadata Store (German National Library of Science and Technology) |
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topic |
Atmospheric chemistry--Environmental aspects Ocean temperature Climatic changes Stratosphere Ozone layer depletion Atmospheric ozone Fluid dynamics Atmosphere Meteorology |
spellingShingle |
Atmospheric chemistry--Environmental aspects Ocean temperature Climatic changes Stratosphere Ozone layer depletion Atmospheric ozone Fluid dynamics Atmosphere Meteorology Waugh, Darryn W. Garfinkel, Chaim I. Polvani, Lorenzo M. Drivers of the Recent Tropical Expansion in the Southern Hemisphere: Changing SSTs or Ozone Depletion? |
topic_facet |
Atmospheric chemistry--Environmental aspects Ocean temperature Climatic changes Stratosphere Ozone layer depletion Atmospheric ozone Fluid dynamics Atmosphere Meteorology |
description |
Observational evidence indicates that the southern edge of the Hadley cell (HC) has shifted southward during austral summer in recent decades. However, there is no consensus on the cause of this shift, with several studies reaching opposite conclusions as to the relative role of changes in sea surface temperatures (SSTs) and stratospheric ozone depletion in causing this shift. Here, the authors perform a meta-analysis of the extant literature on this subject and quantitatively compare the results of all published studies that have used single-forcing model integrations to isolate the role of different factors on the HC expansion during austral summer. It is shown that the weight of the evidence clearly points to stratospheric ozone depletion as the dominant driver of the tropical summertime expansion over the period in which an ozone hole was formed (1979 to late 1990s), although SST trends have contributed to trends since then. Studies that have claimed SSTs as the major driver of tropical expansion since 1979 have used prescribed ozone fields that underrepresent the observed Antarctic ozone depletion. |
format |
Text |
author |
Waugh, Darryn W. Garfinkel, Chaim I. Polvani, Lorenzo M. |
author_facet |
Waugh, Darryn W. Garfinkel, Chaim I. Polvani, Lorenzo M. |
author_sort |
Waugh, Darryn W. |
title |
Drivers of the Recent Tropical Expansion in the Southern Hemisphere: Changing SSTs or Ozone Depletion? |
title_short |
Drivers of the Recent Tropical Expansion in the Southern Hemisphere: Changing SSTs or Ozone Depletion? |
title_full |
Drivers of the Recent Tropical Expansion in the Southern Hemisphere: Changing SSTs or Ozone Depletion? |
title_fullStr |
Drivers of the Recent Tropical Expansion in the Southern Hemisphere: Changing SSTs or Ozone Depletion? |
title_full_unstemmed |
Drivers of the Recent Tropical Expansion in the Southern Hemisphere: Changing SSTs or Ozone Depletion? |
title_sort |
drivers of the recent tropical expansion in the southern hemisphere: changing ssts or ozone depletion? |
publisher |
Columbia University |
publishDate |
2015 |
url |
https://dx.doi.org/10.7916/d87w6c2w https://academiccommons.columbia.edu/doi/10.7916/D87W6C2W |
geographic |
Antarctic Austral |
geographic_facet |
Antarctic Austral |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://dx.doi.org/10.1175/jcli-d-15-0138.1 |
op_doi |
https://doi.org/10.7916/d87w6c2w https://doi.org/10.1175/jcli-d-15-0138.1 |
_version_ |
1766265680808640512 |