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The Deglacial Evolution of North Atlantic Deep Convection

Thornalley, DJR; Barker, S; Broecker, WS; Elderfield, H; McCave, IN; (2011) The Deglacial Evolution of North Atlantic Deep Convection. Science , 331 (6014) 202 - 205. 10.1126/science.1196812. Green open access

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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.

Type: Article
Title: The Deglacial Evolution of North Atlantic Deep Convection
Open access status: An open access version is available from UCL Discovery
DOI: 10.1126/science.1196812
Publisher version: http://dx.doi.org/10.1126/science.1196812
Language: English
Additional information: This is the author's version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published in Science 331, 14 January 2011, doi: 10.1126/science.1196812.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL SLASH
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Dept of Geography
URI: https://discovery.ucl.ac.uk/id/eprint/1396381
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