Ventilation of the Deep Southern Ocean and Deglcaial CO 2 Rise
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Material Information

Title:
Ventilation of the Deep Southern Ocean and Deglcaial CO 2 Rise
Series Title:
Science Magazine Volume 328
Creator:
L.C. Skinner
S. Fallon
C. Waelbroeck
E. Michel
S. Barker
Affiliation:
University of Cambridge -- Department of Earth Science -- Godwin Laboratory for Palaeoclimate Research
Australian National University -- Research School of Earth Sciences
Laboratoire des Sciences du Climate et l'Environnement -- Institut Pierre-Simon Laplace
Laboratoire des Sciences du Climate et l'Environnement -- Institut Pierre-Simon Laplace
Cardiff University -- School of Earth and Ocean Sciences
Place of Publication:
1200 New York Avenue NW, Washington, DC 20005
Publisher:
American Association for the Advancement of Science
Publication Date:
Language:
English

Notes

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. ( English )

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