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:tTgmW-SFa-MxU-qcGX4Gg 2023-05-15T13:36:11+02:00 Southern westerlies in LGM and future (RCP4.5) climates Chavaillaz, Y. Codron, F. Kageyama, M. 2018-09-27 https://doi.org/10.5194/cp-9-517-2013 https://cp.copernicus.org/articles/9/517/2013/ en eng doi:10.5194/cp-9-517-2013 10670/1.jmcwuf https://cp.copernicus.org/articles/9/517/2013/ undefined Geographica Helvetica - geography eISSN: 1814-9332 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2018 fttriple https://doi.org/10.5194/cp-9-517-2013 2023-01-22T17:52:17Z 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. Text 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 Chavaillaz, Y. Codron, F. Kageyama, M. Southern westerlies in LGM and future (RCP4.5) climates |
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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 |
Text |
author |
Chavaillaz, Y. Codron, F. Kageyama, M. |
author_facet |
Chavaillaz, Y. Codron, F. Kageyama, M. |
author_sort |
Chavaillaz, Y. |
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 |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-9-517-2013 https://cp.copernicus.org/articles/9/517/2013/ |
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 |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-9-517-2013 10670/1.jmcwuf https://cp.copernicus.org/articles/9/517/2013/ |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-9-517-2013 |
container_title |
Climate of the Past |
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9 |
container_issue |
2 |
container_start_page |
517 |
op_container_end_page |
524 |
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1766075350492643328 |