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 [CO_2aq]. 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.

中文翻译：

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在最后一次冰期期间，通过碳酸盐反冲泵增强了海洋-大气中的碳分配。

上一次冰期大气pCO ₂上升可能涉及几种协同机制。领先的假设通过增强南极对流（SO）的方式来调用深海碳的释放，并随之降低了全球软组织泵（STP）的效率。但是，STP和碳酸盐反向泵（CCP）的时间演变仍不清楚，因此无法评估它们对pCO ₂升高的贡献。在这里，我们介绍沉积的球墨石记录，以及来自亚南极太平洋的出口生产重建，以记录SO生物碳泵（BCP）对冰期pCO ₂施加的影响。。我们的数据表明，在碳除气阶段BCP减弱，部分原因是CCP升高，地表海洋肥力较高，[CO _2aq ]升高。我们认为，降低BCP效率与增强SO通风相结合，在推动地球摆脱最后一个冰河时代起着重要作用。