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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Published in:Climate of the Past
Main Authors: Y. Chavaillaz, F. Codron, M. Kageyama
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2013
Subjects:
Online Access:https://doi.org/10.5194/cp-9-517-2013
https://doaj.org/article/4363a275b36c4c1189cfdc5cc8507e7a
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spelling 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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