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

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

SUBMITTER: Duchamp-Alphonse S 

PROVIDER: S-EPMC6008475 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature