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Enhanced ocean-atmosphere carbon partitioning via the carbonate counter pump during the last deglacial.

  • Duchamp-Alphonse S GEOPS, Universities of Paris Sud and Paris-Saclay, CNRS, 91405, Orsay, France. stephanie.duchamp@u-psud.fr.
  • Siani G GEOPS, Universities of Paris Sud and Paris-Saclay, CNRS, 91405, Orsay, France.
  • Michel E LSCE/IPSL Laboratoire des Sciences du Climat et de l'Environnement, CEA-CNRS-UVSQ, 91198, Gif-sur-Yvette, France.
  • Beaufort L Aix Marseille Univ, CNRS, IRD, INRA, Coll France, CEREGE, Aix-en-Provence, France.
  • Gally Y Aix Marseille Univ, CNRS, IRD, INRA, Coll France, CEREGE, Aix-en-Provence, France.
  • Jaccard SL Institute of Geological Sciences and Oeschger Center for Climate Change Research, University of Bern, 3012, Bern, Switzerland.
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  • 2018-06-21
Published in:
  • Nature communications. - 2018
General Biochemistry, Genetics and Molecular Biology
General Physics and Astronomy
General Chemistry
English Several synergistic mechanisms were likely involved in the last deglacial atmospheric pCO2 rise. Leading hypotheses invoke a release of deep-ocean carbon through enhanced convection in the Southern Ocean (SO) and concomitant decreased efficiency of the global soft-tissue pump (STP). However, the temporal evolution of both the STP and the carbonate counter pump (CCP) remains unclear, thus preventing the evaluation of their contributions to the pCO2 rise. Here we present sedimentary coccolith records combined with export production reconstructions from the Subantarctic Pacific to document the leverage the SO biological carbon pump (BCP) has imposed on deglacial pCO2. Our data suggest a weakening of BCP during the phases of carbon outgassing, due in part to an increased CCP along with higher surface ocean fertility and elevated [CO2aq]. We propose that reduced BCP efficiency combined with enhanced SO ventilation played a major role in propelling the Earth out of the last ice age.
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  • English
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gold
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https://sonar.ch/global/documents/278728
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