globalchange  > 气候减缓与适应
DOI: 10.1002/grl.50534
Oceanic hindcast simulations at high resolution suggest that the Atlantic MOC is bistable
Author: Deshayes J.; Tréguier A.-M.; Barnier B.; Lecointre A.; Sommer J.L.; Molines J.-M.; Penduff T.; Bourdallé-Badie R.; Drillet Y.; Garric G.; Benshila R.; Madec G.; Biastoch A.; Böning C.W.; Scheinert M.; Coward A.C.; Hirschi J.J.-M.
Source Publication: Geophysical Research Letters
ISSN: 0094-8839
EISSN: 1944-8570
Publishing Year: 2013
Volume: 40, Issue:12
pages begin: 3069
pages end: 3073
Language: 英语
Keyword: AMOC ; bistability ; freshwater ; modeling
Scopus Keyword: AMOC ; Atlantic meridional overturning circulations ; Climate scenarios ; Deep-water formation ; freshwater ; Freshwater transports ; High resolution ; South Atlantic ; Climate models ; International trade ; Models ; Optical bistability ; Water ; Oceanography ; advection ; climate modeling ; deep water formation ; freshwater input ; hindcasting ; marine atmosphere ; meridional circulation ; overturn ; Atlantic Ocean ; Atlantic Ocean (North) ; Atlantic Ocean (South)
English 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. Key Points Simulated AMOC freshwater transport in South Atlantic depends on resolution AMOC in high resolution hindcasts exports freshwater southward, on average AMOC freshwater export has large variability at intra-seasonal timescale ©2013. American Geophysical Union. All Rights Reserved.
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Affiliation: LMI ICEMASA, University of Cape Town, Department of Oceanography, Rondebosch 7701, South Africa

Recommended Citation:
Deshayes J.,Tréguier A.-M.,Barnier B.,et al. Oceanic hindcast simulations at high resolution suggest that the Atlantic MOC is bistable[J]. Geophysical Research Letters,2013-01-01,40(12).
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