Oceanic hindcast simulations at high resolution suggest that the Atlantic MOC is bistable.

Deshayes, J., Tréguier, A.-M., Barnier, B., Lecointre, A., Sommer, J. Le, Molines, Joan-Marc, Penduff, T., Bourdallé-Badie, R., Drillet, Y., Garric, G., Benshila, R., Madec, G., Biastoch, Arne , Böning, Claus W. , Scheinert, Markus , Coward, A. C. and Hirschi, J. J.-M. (2013) Oceanic hindcast simulations at high resolution suggest that the Atlantic MOC is bistable. Open Access Geophysical Research Letters, 40 (12). pp. 3069-3073. DOI 10.1002/grl.50534.

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Abstract

All climate models predict a freshening of the North Atlantic at high latitude that may induce an abrupt change of the Atlantic Meridional Overturning Circulation (hereafter AMOC) if it resides in the bistable regime, where both a strong and a weak state coexist. The latter remains uncertain as there is no consensus among observations and ocean reanalyses, where the AMOC is bistable, versus most climate models that reproduce a mono-stable strong AMOC. A series of four hindcast simulations of the global ocean at 1/12° resolution, which is presently unique, are used to diagnose freshwater transport by the AMOC in the South Atlantic, an indicator of AMOC bistability. In all simulations, the AMOC resides in the bistable regime: it exports freshwater southward in the South Atlantic, implying a positive salt advection feedback that would act to amplify a decreasing trend in subarctic deep water formation as projected in climate scenarios.

Document Type: Article
Funder compliance: info:eu-repo/grantAgreement/EC/FP7/218812
Additional Information: WOS:000321951300034
Keywords: AMOC; freshwater; bistability; modeling
Research affiliation: OceanRep > SFB 754 > A2
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
OceanRep > SFB 754
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1002/grl.50534
ISSN: 0094-8276
Projects: DRAKKAR, BMBF Nordatlantik 2, MyOcean, SFB754
Expeditions/Models/Experiments:
Date Deposited: 15 Jul 2013 12:20
Last Modified: 10 Apr 2017 08:47
URI: http://oceanrep.geomar.de/id/eprint/21557

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