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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2007
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fttibhannoverren:oai:oa.tib.eu:123456789/624 2023-07-30T03:58:33+02:00 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://oa.tib.eu/renate/handle/123456789/624 https://doi.org/10.34657/1330 eng eng München : European Geopyhsical Union DOI:https://doi.org/10.5194/cp-3-51-2007 https://doi.org/10.34657/1330 https://oa.tib.eu/renate/handle/123456789/624 CC BY-NC-SA 2.5 Unported https://creativecommons.org/licenses/by-nc-sa/2.5/ frei zugänglich 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 ddc:550 status-type:publishedVersion doc-type:article doc-type:Text 2007 fttibhannoverren https://doi.org/10.34657/133010.5194/cp-3-51-2007 2023-07-10T16:19:43Z 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. Article in Journal/Newspaper Antarc* Antarctic NADW North Atlantic Deep Water North Atlantic Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover) Antarctic |
institution |
Open Polar |
collection |
Renate - Repositorium für Naturwissenschaften und Technik (TIB Hannover) |
op_collection_id |
fttibhannoverren |
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 ddc: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 ddc: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 ddc: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. |
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://oa.tib.eu/renate/handle/123456789/624 https://doi.org/10.34657/1330 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
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_relation |
DOI:https://doi.org/10.5194/cp-3-51-2007 https://doi.org/10.34657/1330 https://oa.tib.eu/renate/handle/123456789/624 |
op_rights |
CC BY-NC-SA 2.5 Unported https://creativecommons.org/licenses/by-nc-sa/2.5/ frei zugänglich |
op_doi |
https://doi.org/10.34657/133010.5194/cp-3-51-2007 |
_version_ |
1772821322017013760 |