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The Southern Ocean’s role in carbon exchange during the last deglaciation

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Author(s)

Andrea Burke, Laura F. Robinson

School/Research organisations

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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Original languageEnglish
Pages (from-to)557-561
JournalScience
Volume335
Issue number6068
Early online date15 Dec 2011
DOIs
StatePublished - 2012

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