[OANNES Foro] The Southern Ocean's Role in Carbon Exchange During the Last Deglaciation

[Mario Cabrejos]

Published Online December 15 2011
Science 3 February 2012: 
Vol. 335 no. 6068 pp. 557-561 
DOI: 10.1126/science.1208163 


The Southern Ocean's Role in Carbon Exchange During the Last Deglaciation
Andrea Burke1,2,*, Laura F. Robinson2,3
1Massachusetts Institute of Technology/Woods Hole Oceanographic Institution Joint Program in Oceanography, Mailstop 24, Woods Hole, MA 02543, USA. 2Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Mailstop 25, Woods Hole, MA 02543, USA. 3School of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, Bristol BS8 1RJ, UK. E-mail: aburke en whoi.edu

Abstract
Changes in the upwelling and degassing of carbon from the Southern Ocean form one of the leading hypotheses for the cause of glacial-interglacial changes in atmospheric carbon dioxide. We present a 25,000-year-long Southern Ocean radiocarbon record reconstructed from deep-sea corals, which shows radiocarbon-depleted waters during the glacial period and through the early deglaciation. This depletion and associated deep stratification disappeared by ~14.6 ka (thousand years ago), consistent with the transfer of carbon from the deep ocean to the surface ocean and atmosphere via a Southern Ocean ventilation event. Given this evidence for carbon exchange in the Southern Ocean, we show that existing deep-ocean radiocarbon records from the glacial period are sufficiently depleted to explain the ~190 per mil drop in atmospheric radiocarbon between ~17 and 14.5 ka. 



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