Destabilization of glacial climate by the radiative impact of Atlantic Meridional overturning circulation disruptions
Galbraith, Eric (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Merlis, Timothy M. (McGill University. Atmospheric and Oceanic Science)
Palter, Jaime B. (University of Rhode Island. Graduate School of Oceanography)

Date:	2016
Abstract:	During each of the dramatic global warmings that ended the Pleistocene ice ages, the Atlantic Meridional Overturning Circulation (AMOC) was disrupted. It is not clear whether this was a contributing cause or simply an effect of deglaciation. Here we show that in an ensemble of simulations with a global climate model, AMOC disruption causes a consistent and sustained positive radiative imbalance of ~0. 4Wm2. The imbalance is accommodated by heat accumulation in the ocean interior, representing an overall planetary warming, subsequently released by deep convection in the North Atlantic when the AMOC resumes. The results suggest a means by which AMOC disruptions could have helped to tip the planet out of stable glaciated states. However, the fact that AMOC disruptions occurred during prior Heinrich Stadials without causing deglaciation shows that other factors, such as ice sheet dynamics, or controls on CO2, were also key for deglaciation.
Note:	Unidad de excelencia María de Maeztu MdM-2015-0552
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Published in:	Geophysical research letters, Vol. 43 issue 15 (August 2016) , p. 8214-8221, ISSN 0094-8276

DOI: 10.1002/2016GL069846

8 p, 2.0 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Institut de Ciència i Tecnologia Ambientals (ICTA) > Integrated Earth System Dynamics Laboratory (IESD)
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