The modern and glacial overturning circulation in the Atlantic ocean in PMIP coupled model simulations
This study analyses the response of the Atlantic meridional overturning circulation (AMOC) to LGM forcings and boundary conditions in nine PMIP coupled model simulations, including both GCMs and Earth system Models of Intermediate Complexity. Model results differ widely. The AMOC slows down consider...
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München : European Geopyhsical Union
2007
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Online Access: | https://doi.org/10.34657/1330 https://oa.tib.eu/renate/handle/123456789/624 |
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ftleibnizopen:oai:oai.leibnizopen.de:GS_SeYsBBwLIz6xGnvW5 2023-11-12T04:06:41+01:00 The modern and glacial overturning circulation in the Atlantic ocean in PMIP coupled model simulations Weber, S.L. Drijfhout, S.S. Abe-Ouchi, A. Crucifix, M. Eby, M. Ganopolski, A. Murakami, S. Otto-Bliesner, B. Peltier, W.R. 2007 application/pdf https://doi.org/10.34657/1330 https://oa.tib.eu/renate/handle/123456789/624 eng eng München : European Geopyhsical Union CC BY-NC-SA 2.5 Unported https://creativecommons.org/licenses/by-nc-sa/2.5/ Climate of the Past, Volume 3, Issue 1, Page 51-64 Bottom water circulation modeling climate forcing climate modeling deep water density evaporation freshwater input Last Glacial Maximum meridional circulation overturn paleoceanography paleoclimate salinity temperature gradient 550 article Text 2007 ftleibnizopen https://doi.org/10.34657/1330 2023-10-30T00:19:33Z This study analyses the response of the Atlantic meridional overturning circulation (AMOC) to LGM forcings and boundary conditions in nine PMIP coupled model simulations, including both GCMs and Earth system Models of Intermediate Complexity. Model results differ widely. The AMOC slows down considerably (by 20–40%) during the LGM as compared to the modern climate in four models, there is a slight reduction in one model and four models show a substantial increase in AMOC strength (by 10–40%). It is found that a major controlling factor for the AMOC response is the density contrast between Antarctic Bottom Water (AABW) and North Atlantic Deep Water (NADW) at their source regions. Changes in the density contrast are determined by the opposing effects of changes in temperature and salinity, with more saline AABW as compared to NADW consistently found in all models and less cooling of AABW in all models but one. In only two models is the AMOC response during the LGM directly related to the response in net evaporation over the Atlantic basin. Most models show large changes in the ocean freshwater transports into the basin, but this does not seem to affect the AMOC response. Finally, there is some dependence on the accuracy of the control state. publishedVersion Article in Journal/Newspaper Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic Unknown |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftleibnizopen |
language |
English |
topic |
Bottom water circulation modeling climate forcing climate modeling deep water density evaporation freshwater input Last Glacial Maximum meridional circulation overturn paleoceanography paleoclimate salinity temperature gradient 550 |
spellingShingle |
Bottom water circulation modeling climate forcing climate modeling deep water density evaporation freshwater input Last Glacial Maximum meridional circulation overturn paleoceanography paleoclimate salinity temperature gradient 550 Weber, S.L. Drijfhout, S.S. Abe-Ouchi, A. Crucifix, M. Eby, M. Ganopolski, A. Murakami, S. Otto-Bliesner, B. Peltier, W.R. The modern and glacial overturning circulation in the Atlantic ocean in PMIP coupled model simulations |
topic_facet |
Bottom water circulation modeling climate forcing climate modeling deep water density evaporation freshwater input Last Glacial Maximum meridional circulation overturn paleoceanography paleoclimate salinity temperature gradient 550 |
description |
This study analyses the response of the Atlantic meridional overturning circulation (AMOC) to LGM forcings and boundary conditions in nine PMIP coupled model simulations, including both GCMs and Earth system Models of Intermediate Complexity. Model results differ widely. The AMOC slows down considerably (by 20–40%) during the LGM as compared to the modern climate in four models, there is a slight reduction in one model and four models show a substantial increase in AMOC strength (by 10–40%). It is found that a major controlling factor for the AMOC response is the density contrast between Antarctic Bottom Water (AABW) and North Atlantic Deep Water (NADW) at their source regions. Changes in the density contrast are determined by the opposing effects of changes in temperature and salinity, with more saline AABW as compared to NADW consistently found in all models and less cooling of AABW in all models but one. In only two models is the AMOC response during the LGM directly related to the response in net evaporation over the Atlantic basin. Most models show large changes in the ocean freshwater transports into the basin, but this does not seem to affect the AMOC response. Finally, there is some dependence on the accuracy of the control state. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Weber, S.L. Drijfhout, S.S. Abe-Ouchi, A. Crucifix, M. Eby, M. Ganopolski, A. Murakami, S. Otto-Bliesner, B. Peltier, W.R. |
author_facet |
Weber, S.L. Drijfhout, S.S. Abe-Ouchi, A. Crucifix, M. Eby, M. Ganopolski, A. Murakami, S. Otto-Bliesner, B. Peltier, W.R. |
author_sort |
Weber, S.L. |
title |
The modern and glacial overturning circulation in the Atlantic ocean in PMIP coupled model simulations |
title_short |
The modern and glacial overturning circulation in the Atlantic ocean in PMIP coupled model simulations |
title_full |
The modern and glacial overturning circulation in the Atlantic ocean in PMIP coupled model simulations |
title_fullStr |
The modern and glacial overturning circulation in the Atlantic ocean in PMIP coupled model simulations |
title_full_unstemmed |
The modern and glacial overturning circulation in the Atlantic ocean in PMIP coupled model simulations |
title_sort |
modern and glacial overturning circulation in the atlantic ocean in pmip coupled model simulations |
publisher |
München : European Geopyhsical Union |
publishDate |
2007 |
url |
https://doi.org/10.34657/1330 https://oa.tib.eu/renate/handle/123456789/624 |
genre |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic |
genre_facet |
Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic |
op_source |
Climate of the Past, Volume 3, Issue 1, Page 51-64 |
op_rights |
CC BY-NC-SA 2.5 Unported https://creativecommons.org/licenses/by-nc-sa/2.5/ |
op_doi |
https://doi.org/10.34657/1330 |
_version_ |
1782327715744972800 |