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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ftdoajarticles:oai:doaj.org/article:1c7596edb9ab4dca9bb0f92ae02bc8f5 2023-05-15T13:53:08+02:00 The modern and glacial overturning circulation in the Atlantic ocean in PMIP coupled model simulations S. L. Weber S. S. Drijfhout A. Abe-Ouchi M. Crucifix M. Eby A. Ganopolski S. Murakami B. Otto-Bliesner W. R. Peltier 2007-01-01T00:00:00Z https://doaj.org/article/1c7596edb9ab4dca9bb0f92ae02bc8f5 EN eng Copernicus Publications http://www.clim-past.net/3/51/2007/cp-3-51-2007.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 https://doaj.org/article/1c7596edb9ab4dca9bb0f92ae02bc8f5 Climate of the Past, Vol 3, Iss 1, Pp 51-64 (2007) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2007 ftdoajarticles 2022-12-31T11:36:02Z 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 Directory of Open Access Journals: DOAJ Articles Antarctic |
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 S. L. Weber S. S. Drijfhout A. Abe-Ouchi M. Crucifix M. Eby A. Ganopolski S. Murakami B. Otto-Bliesner W. R. Peltier The modern and glacial overturning circulation in the Atlantic ocean in PMIP coupled model simulations |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
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 |
S. L. Weber S. S. Drijfhout A. Abe-Ouchi M. Crucifix M. Eby A. Ganopolski S. Murakami B. Otto-Bliesner W. R. Peltier |
author_facet |
S. L. Weber S. S. Drijfhout A. Abe-Ouchi M. Crucifix M. Eby A. Ganopolski S. Murakami B. Otto-Bliesner W. R. Peltier |
author_sort |
S. L. Weber |
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 |
Copernicus Publications |
publishDate |
2007 |
url |
https://doaj.org/article/1c7596edb9ab4dca9bb0f92ae02bc8f5 |
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, Vol 3, Iss 1, Pp 51-64 (2007) |
op_relation |
http://www.clim-past.net/3/51/2007/cp-3-51-2007.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 https://doaj.org/article/1c7596edb9ab4dca9bb0f92ae02bc8f5 |
_version_ |
1766258082313142272 |