Stratospheric influence on circulation changes in the Southern Hemisphere troposphere in coupled climate models
[1] The recent intensification of the circumpolar circulation in the SH troposphere in summer and autumn has been attributed to external forcing such as stratospheric ozone depletion and greenhouse gas (GHG) increases. Several studies have shown that climate models are able to simulate observed chan...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.457.4586 2023-05-15T13:58:00+02:00 Stratospheric influence on circulation changes in the Southern Hemisphere troposphere in coupled climate models The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.457.4586 http://www.cccma.ec.gc.ca/papers/ngillett/PDFS/2008GL035354.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.457.4586 http://www.cccma.ec.gc.ca/papers/ngillett/PDFS/2008GL035354.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.cccma.ec.gc.ca/papers/ngillett/PDFS/2008GL035354.pdf text ftciteseerx 2016-01-08T06:17:34Z [1] The recent intensification of the circumpolar circulation in the SH troposphere in summer and autumn has been attributed to external forcing such as stratospheric ozone depletion and greenhouse gas (GHG) increases. Several studies have shown that climate models are able to simulate observed changes when forced by observed ozone trends or combined ozone and GHG trends. However, as some of these studies suffered from erroneously specified forcing, the reason for the circulation intensification remains debatable. Here, we re-approach this issue using data from 21 CMIP3 models. We demonstrate that only models that include ozone depletion simulate downward propagation of the circulation changes from the stratosphere to the troposphere similar to that observed, with GHG increases causing significant Antarctic geopotential height trends only in the lower troposphere. These changes are simulated by the majority of the ozone-forced models except those with the lowest vertical resolution between 300 hPa and 10 hPa. Text Antarc* Antarctic Unknown Antarctic |
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ftciteseerx |
language |
English |
description |
[1] The recent intensification of the circumpolar circulation in the SH troposphere in summer and autumn has been attributed to external forcing such as stratospheric ozone depletion and greenhouse gas (GHG) increases. Several studies have shown that climate models are able to simulate observed changes when forced by observed ozone trends or combined ozone and GHG trends. However, as some of these studies suffered from erroneously specified forcing, the reason for the circulation intensification remains debatable. Here, we re-approach this issue using data from 21 CMIP3 models. We demonstrate that only models that include ozone depletion simulate downward propagation of the circulation changes from the stratosphere to the troposphere similar to that observed, with GHG increases causing significant Antarctic geopotential height trends only in the lower troposphere. These changes are simulated by the majority of the ozone-forced models except those with the lowest vertical resolution between 300 hPa and 10 hPa. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
title |
Stratospheric influence on circulation changes in the Southern Hemisphere troposphere in coupled climate models |
spellingShingle |
Stratospheric influence on circulation changes in the Southern Hemisphere troposphere in coupled climate models |
title_short |
Stratospheric influence on circulation changes in the Southern Hemisphere troposphere in coupled climate models |
title_full |
Stratospheric influence on circulation changes in the Southern Hemisphere troposphere in coupled climate models |
title_fullStr |
Stratospheric influence on circulation changes in the Southern Hemisphere troposphere in coupled climate models |
title_full_unstemmed |
Stratospheric influence on circulation changes in the Southern Hemisphere troposphere in coupled climate models |
title_sort |
stratospheric influence on circulation changes in the southern hemisphere troposphere in coupled climate models |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.457.4586 http://www.cccma.ec.gc.ca/papers/ngillett/PDFS/2008GL035354.pdf |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
http://www.cccma.ec.gc.ca/papers/ngillett/PDFS/2008GL035354.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.457.4586 http://www.cccma.ec.gc.ca/papers/ngillett/PDFS/2008GL035354.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766265939517505536 |