Contribution of Southern Ocean surface-water stratification to low atmospheric CO2 concentrations during the last glacial period

Roger François (), Mark A. Altabet, Ein-Fen Yu, Daniel M. Sigman, Michael P. Bacon, Martin Frank, Gerhard Bohrmann, Gilles Bareille and Laurent D. Labeyrie
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Roger François: Department of Marine Chemistry and Geochemistry
Mark A. Altabet: Woods Hole Oceanographic Institution
Ein-Fen Yu: University of Massachusetts
Daniel M. Sigman: National Taiwan Normal University
Michael P. Bacon: Department of Marine Chemistry and Geochemistry
Martin Frank: University of Oxford
Gerhard Bohrmann: GEOMAR Research Center for Marine Geosciences
Gilles Bareille: Université de Bordeaux I
Laurent D. Labeyrie: Centre des Faibles Radioactivités, Laboratoire mixte CNRS-CEA

Nature, 1997, vol. 389, issue 6654, 929-935

Abstract: Abstract The nitrogen-isotope record preserved in Southern Ocean sediments, along with several geochemical tracers for the settling fluxes of biogenic matter, reveals patterns of past nutrient supply to phytoplankton and surface-water stratification in this oceanic region. Areal averaging of these spatial patterns indicates that reduction of the CO2 ‘leak’ from ocean to atmosphere by increased surface-water stratification south of the Polar Front made a greater contribution to the lowering of atmospheric CO2 concentration during the Last Glacial Maximum than did the increased export of organic carbon from surface to deep waters occurring further north.

Date: 1997
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DOI: 10.1038/40073

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