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| Titel |
The modern and glacial overturning circulation in the Atlantic ocean in PMIP coupled model simulations |
| VerfasserIn |
S. L. Weber, S. S. Drijfhout, A. Abe-Ouchi, M. Crucifix, M. Eby, A. Ganopolski, S. Murakami, B. Otto-Bliesner, W. R. Peltier |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 3, no. 1 ; Nr. 3, no. 1 (2007-02-01), S.51-64 |
| Datensatznummer |
250000740
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| Publikation (Nr.) |
 copernicus.org/cp-3-51-2007.pdf |
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| Zusammenfassung |
| 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. |
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