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 CO 2 exchanges. The Southern Hemisphere westerlies have been par...
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ftdoajarticles:oai:doaj.org/article:4363a275b36c4c1189cfdc5cc8507e7a 2023-05-15T13:41:13+02:00 Southern westerlies in LGM and future (RCP4.5) climates Y. Chavaillaz F. Codron M. Kageyama 2013-03-01T00:00:00Z https://doi.org/10.5194/cp-9-517-2013 https://doaj.org/article/4363a275b36c4c1189cfdc5cc8507e7a EN eng Copernicus Publications http://www.clim-past.net/9/517/2013/cp-9-517-2013.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-9-517-2013 1814-9324 1814-9332 https://doaj.org/article/4363a275b36c4c1189cfdc5cc8507e7a Climate of the Past, Vol 9, Iss 2, Pp 517-524 (2013) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2013 ftdoajarticles https://doi.org/10.5194/cp-9-517-2013 2022-12-31T03:34:56Z 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 CO 2 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 CO 2 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 Directory of Open Access Journals: DOAJ Articles Antarctic Southern Ocean The Antarctic Climate of the Past 9 2 517 524 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 Y. Chavaillaz F. Codron M. Kageyama Southern westerlies in LGM and future (RCP4.5) climates |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
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 CO 2 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 CO 2 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 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 |
http://www.clim-past.net/9/517/2013/cp-9-517-2013.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-9-517-2013 1814-9324 1814-9332 https://doaj.org/article/4363a275b36c4c1189cfdc5cc8507e7a |
op_doi |
https://doi.org/10.5194/cp-9-517-2013 |
container_title |
Climate of the Past |
container_volume |
9 |
container_issue |
2 |
container_start_page |
517 |
op_container_end_page |
524 |
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1766147253819408384 |