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Ventilation of the deep Southern Ocean and deglacial CO2 rise

Skinner, L. C., Fallon, S., Waelbroeck, C., Michel, E. and Barker, Stephen ORCID: 2010. Ventilation of the deep Southern Ocean and deglacial CO2 rise. Science 328 (5982) , pp. 1147-1151. 10.1126/science.1183627

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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
Date Type: Publication
Status: Published
Schools: Earth and Environmental Sciences
Subjects: G Geography. Anthropology. Recreation > GC Oceanography
Q Science > QE Geology
Publisher: American Association for the Advancement of Science
ISSN: 0036-8075
Last Modified: 18 Oct 2022 12:45

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