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

Stéphanie Duchamp-Alphonse (), Giuseppe Siani, Elisabeth Michel, Luc Beaufort, Yves Gally and Samuel L. Jaccard
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Stéphanie Duchamp-Alphonse: CNRS
Giuseppe Siani: CNRS
Elisabeth Michel: CEA-CNRS-UVSQ
Luc Beaufort: CEREGE
Yves Gally: CEREGE
Samuel L. Jaccard: University of Bern

Nature Communications, 2018, vol. 9, issue 1, 1-10

Abstract: Abstract 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.

Date: 2018
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DOI: 10.1038/s41467-018-04625-7

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