Age determination of sediment cores MD 07-3076 and MD99-2334, supplement to: Skinner, Luke C; Fallon, Robert D; Waelbroeck, Claire; Michel, Elisabeth; Barker, S (2010): Ventilation of the Deep Southern Ocean and Deglacial CO2 Rise. Science, 328(5982), 1147-1151

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 str...

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Bibliographic Details
Main Authors: Skinner, Luke C, Fallon, Robert D, Waelbroeck, Claire, Michel, Elisabeth, Barker, S
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA - Data Publisher for Earth & Environmental Science 2011
Subjects:
Antarctic
Southern Ocean
The Antarctic
Luke
Antarc*
Antarctica
Online Access:https://dx.doi.org/10.1594/pangaea.829760
https://doi.pangaea.de/10.1594/PANGAEA.829760
Description
Summary: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.

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