Can the Delay in Antarctic Polar Vortex Breakup Explain Recent Trends in Surface Westerlies
The authors test the hypothesis that recent observed trends in surface westerlies in the Southern Hemisphere are directly consequent on observed trends in the timing of stratospheric final warming events. The analysis begins by verifying that final warming events have an impact on tropospheric circu...
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ftpubman:oai:pure.mpg.de:item_2036890 2023-08-20T04:01:38+02:00 Can the Delay in Antarctic Polar Vortex Breakup Explain Recent Trends in Surface Westerlies Sheshadri, A. Plumb, R. Domeisen, D. 2014-02 http://hdl.handle.net/11858/00-001M-0000-0019-D9EF-9 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1175/JAS-D-12-0343.1 http://hdl.handle.net/11858/00-001M-0000-0019-D9EF-9 JOURNAL OF THE ATMOSPHERIC SCIENCES info:eu-repo/semantics/article 2014 ftpubman https://doi.org/10.1175/JAS-D-12-0343.1 2023-08-01T22:40:49Z The authors test the hypothesis that recent observed trends in surface westerlies in the Southern Hemisphere are directly consequent on observed trends in the timing of stratospheric final warming events. The analysis begins by verifying that final warming events have an impact on tropospheric circulation in a simplified GCM driven by specified equilibrium temperature distributions. Seasonal variations are imposed in the stratosphere only. The model produces qualitatively realistic final warming events whose influence extends down to the surface, much like what has been reported in observational analyses. The authors then go on to study observed trends in surface westerlies composited with respect to the date of final warming events. If the considered hypothesis were correct, these trends would appear to be much weaker when composited with respect to the date of the final warming events. The authors find that this is not the case, and accordingly they conclude that the observed surface changes cannot be attributed simply to this shift toward later final warming events. Article in Journal/Newspaper Antarc* Antarctic Max Planck Society: MPG.PuRe Antarctic Journal of the Atmospheric Sciences 71 2 566 573 |
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Open Polar |
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Max Planck Society: MPG.PuRe |
op_collection_id |
ftpubman |
language |
English |
description |
The authors test the hypothesis that recent observed trends in surface westerlies in the Southern Hemisphere are directly consequent on observed trends in the timing of stratospheric final warming events. The analysis begins by verifying that final warming events have an impact on tropospheric circulation in a simplified GCM driven by specified equilibrium temperature distributions. Seasonal variations are imposed in the stratosphere only. The model produces qualitatively realistic final warming events whose influence extends down to the surface, much like what has been reported in observational analyses. The authors then go on to study observed trends in surface westerlies composited with respect to the date of final warming events. If the considered hypothesis were correct, these trends would appear to be much weaker when composited with respect to the date of the final warming events. The authors find that this is not the case, and accordingly they conclude that the observed surface changes cannot be attributed simply to this shift toward later final warming events. |
format |
Article in Journal/Newspaper |
author |
Sheshadri, A. Plumb, R. Domeisen, D. |
spellingShingle |
Sheshadri, A. Plumb, R. Domeisen, D. Can the Delay in Antarctic Polar Vortex Breakup Explain Recent Trends in Surface Westerlies |
author_facet |
Sheshadri, A. Plumb, R. Domeisen, D. |
author_sort |
Sheshadri, A. |
title |
Can the Delay in Antarctic Polar Vortex Breakup Explain Recent Trends in Surface Westerlies |
title_short |
Can the Delay in Antarctic Polar Vortex Breakup Explain Recent Trends in Surface Westerlies |
title_full |
Can the Delay in Antarctic Polar Vortex Breakup Explain Recent Trends in Surface Westerlies |
title_fullStr |
Can the Delay in Antarctic Polar Vortex Breakup Explain Recent Trends in Surface Westerlies |
title_full_unstemmed |
Can the Delay in Antarctic Polar Vortex Breakup Explain Recent Trends in Surface Westerlies |
title_sort |
can the delay in antarctic polar vortex breakup explain recent trends in surface westerlies |
publishDate |
2014 |
url |
http://hdl.handle.net/11858/00-001M-0000-0019-D9EF-9 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
JOURNAL OF THE ATMOSPHERIC SCIENCES |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/JAS-D-12-0343.1 http://hdl.handle.net/11858/00-001M-0000-0019-D9EF-9 |
op_doi |
https://doi.org/10.1175/JAS-D-12-0343.1 |
container_title |
Journal of the Atmospheric Sciences |
container_volume |
71 |
container_issue |
2 |
container_start_page |
566 |
op_container_end_page |
573 |
_version_ |
1774724884506607616 |