Ventilation of the Deep Southern Ocean and Deglacial CO2 Rise

Skinner, L. C. and Fallon, S. and Waelbroeck, C. and Michel, E. and Barker, S. (2010) Ventilation of the Deep Southern Ocean and Deglacial CO2 Rise. Science, 328 (5982). pp. 1147-1151. DOI 10.1126/science.1183627

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Official URL: http://www.sciencemag.org/cgi/content/abstract/328...

Abstract

Past glacial-interglacial increases in the concentration of atmospheric carbon dioxide (CO2) are thought to arise from the rapid release of CO2 sequestered in the deep sea, primarily via the Southern Ocean. Here, we present radiocarbon evidence from the Atlantic sector of the Southern Ocean that strongly supports this hypothesis. We show that during the last glacial period, deep water circulating around Antarctica was more than two times older than today relative to the atmosphere. During deglaciation, the dissipation of this old and presumably CO2-enriched deep water played an important role in the pulsed rise of atmospheric CO2 through its variable influence on the upwelling branch of the Antarctic overturning circulation.

Item Type: Article
Uncontrolled Keywords: 2010AREP; IA60;
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
Journal or Publication Title: Science
Volume: 328
Page Range: pp. 1147-1151
Identification Number: 10.1126/science.1183627
Depositing User: Sarah Humbert
Date Deposited: 29 May 2010 11:08
Last Modified: 23 Jul 2013 09:57
URI: http://eprints.esc.cam.ac.uk/id/eprint/1405

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