Southern westerlies in LGM and future (RCP4.5) climates
Mid-latitude westerlies are a major component of the atmospheric circulation and understanding their behaviour under climate change is important for understanding changes in precipitation, storms and atmosphere–ocean momentum, heat and CO2 exchanges. The Southern Hemisphere westerlies have been part...
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fttriple:oai:gotriple.eu:oai:doaj.org/article:4363a275b36c4c1189cfdc5cc8507e7a 2023-05-15T13:39:35+02:00 Southern westerlies in LGM and future (RCP4.5) climates Y. Chavaillaz F. Codron M. Kageyama 2013-03-01 https://doi.org/10.5194/cp-9-517-2013 http://www.clim-past.net/9/517/2013/cp-9-517-2013.pdf https://doaj.org/article/4363a275b36c4c1189cfdc5cc8507e7a en eng Copernicus Publications doi:10.5194/cp-9-517-2013 1814-9324 1814-9332 http://www.clim-past.net/9/517/2013/cp-9-517-2013.pdf https://doaj.org/article/4363a275b36c4c1189cfdc5cc8507e7a undefined Climate of the Past, Vol 9, Iss 2, Pp 517-524 (2013) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2013 fttriple https://doi.org/10.5194/cp-9-517-2013 2023-01-22T18:19:42Z Mid-latitude westerlies are a major component of the atmospheric circulation and understanding their behaviour under climate change is important for understanding changes in precipitation, storms and atmosphere–ocean momentum, heat and CO2 exchanges. The Southern Hemisphere westerlies have been particularly studied in terms of the latter aspects, since the Southern Ocean is a key region for the global oceanic circulation as well as for CO2 uptake. In this study, we analyse, mainly in terms of jet stream position, the behaviour of the southern westerlies for the Last Glacial Maximum (LGM, 21 000 yr ago, which is the last past cold extreme) and for a future climate, obtained after stabilisation of the RCP4.5 scenario. The a priori guess would be that the behaviour of the westerly jet stream would be similar when examining its changes from LGM to pre-industrial (PI) conditions and from PI to RCP4.5, i.e. in both cases a poleward shift in response to global warming. We show that this is in fact not the case, due to the impact of altitude changes of the Antarctic ice sheet and/or to sea ice cover changes. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Sea ice Southern Ocean Unknown Antarctic Southern Ocean The Antarctic Climate of the Past 9 2 517 524 |
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geo envir Y. Chavaillaz F. Codron M. Kageyama Southern westerlies in LGM and future (RCP4.5) climates |
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geo envir |
description |
Mid-latitude westerlies are a major component of the atmospheric circulation and understanding their behaviour under climate change is important for understanding changes in precipitation, storms and atmosphere–ocean momentum, heat and CO2 exchanges. The Southern Hemisphere westerlies have been particularly studied in terms of the latter aspects, since the Southern Ocean is a key region for the global oceanic circulation as well as for CO2 uptake. In this study, we analyse, mainly in terms of jet stream position, the behaviour of the southern westerlies for the Last Glacial Maximum (LGM, 21 000 yr ago, which is the last past cold extreme) and for a future climate, obtained after stabilisation of the RCP4.5 scenario. The a priori guess would be that the behaviour of the westerly jet stream would be similar when examining its changes from LGM to pre-industrial (PI) conditions and from PI to RCP4.5, i.e. in both cases a poleward shift in response to global warming. We show that this is in fact not the case, due to the impact of altitude changes of the Antarctic ice sheet and/or to sea ice cover changes. |
format |
Article in Journal/Newspaper |
author |
Y. Chavaillaz F. Codron M. Kageyama |
author_facet |
Y. Chavaillaz F. Codron M. Kageyama |
author_sort |
Y. Chavaillaz |
title |
Southern westerlies in LGM and future (RCP4.5) climates |
title_short |
Southern westerlies in LGM and future (RCP4.5) climates |
title_full |
Southern westerlies in LGM and future (RCP4.5) climates |
title_fullStr |
Southern westerlies in LGM and future (RCP4.5) climates |
title_full_unstemmed |
Southern westerlies in LGM and future (RCP4.5) climates |
title_sort |
southern westerlies in lgm and future (rcp4.5) climates |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/cp-9-517-2013 http://www.clim-past.net/9/517/2013/cp-9-517-2013.pdf https://doaj.org/article/4363a275b36c4c1189cfdc5cc8507e7a |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Ice Sheet Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Sheet Sea ice Southern Ocean |
op_source |
Climate of the Past, Vol 9, Iss 2, Pp 517-524 (2013) |
op_relation |
doi:10.5194/cp-9-517-2013 1814-9324 1814-9332 http://www.clim-past.net/9/517/2013/cp-9-517-2013.pdf https://doaj.org/article/4363a275b36c4c1189cfdc5cc8507e7a |
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op_doi |
https://doi.org/10.5194/cp-9-517-2013 |
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Climate of the Past |
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9 |
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2 |
container_start_page |
517 |
op_container_end_page |
524 |
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1766120504694931456 |