The Deglacial Evolution of North Atlantic Deep Convection

Thornalley, David J. R. and Barker, Stephen and Broecker, Wallace S. and Elderfield, Henry and McCave, I. Nick (2011) The Deglacial Evolution of North Atlantic Deep Convection. Science, 331 (6014). 202 -205. DOI 10.1126/science.1196812

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Abstract

Deepwater formation in the North Atlantic by open-ocean convection is an essential component of the overturning circulation of the Atlantic Ocean, which helps regulate global climate. We use water-column radiocarbon reconstructions to examine changes in northeast Atlantic convection since the Last Glacial Maximum. During cold intervals, we infer a reduction in open-ocean convection and an associated incursion of an extremely radiocarbon (14C)–depleted water mass, interpreted to be Antarctic Intermediate Water. Comparing the timing of deep convection changes in the northeast and northwest Atlantic, we suggest that, despite a strong control on Greenland temperature by northeast Atlantic convection, reduced open-ocean convection in both the northwest and northeast Atlantic is necessary to account for contemporaneous perturbations in atmospheric circulation.

Item Type: Article
Uncontrolled Keywords: 2010AREP; IA61;
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: Science
Volume: 331
Page Range: 202 -205
Identification Number: 10.1126/science.1196812
Depositing User: Sarah Humbert
Date Deposited: 29 Jan 2011 13:11
Last Modified: 23 Jul 2013 10:00
URI: http://eprints.esc.cam.ac.uk/id/eprint/1993

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