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Provedor de dados:  ArchiMer
País:  France
Título:  Enhanced ocean-atmosphere carbon partitioning via the carbonate counter pump during the last deglacial
Autores:  Duchamp-alphonse, Stephanie
Siani, Giuseppe
Michel, Elisabeth
Beaufort, Luc
Gally, Yves
Jaccard, Samuel L.
Data:  2018-06
Ano:  2018
Resumo:  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.
Tipo:  Text
Idioma:  Inglês

Editor:  Nature Publishing Group
Formato:  application/pdf
Fonte:  Nature Communications (2041-1723) (Nature Publishing Group), 2018-06 , Vol. 9 , N. 1 , P. 2396 (10p.)
Direitos:  The Author(s) 2018


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