摘要：The transfer of vast amounts of carbon from a deep oceanic reservoir to the atmosphere is considered to be a dominant driver of the deglacial rise in atmospheric CO
2. Paleoceanographic reconstructions reveal evidence for the existence of CO
2-rich waters in the mid to deep Southern Ocean. These water masses ventilate to the atmosphere south of the Polar Front, releasing CO
2 prior to the formation and subduction of intermediate-waters. Changes in the amount of CO
2 in the sea water directly affect the oceanic carbon chemistry system. Here we present B/Ca ratios, a proxy for delta carbonate ion concentrations Δ[CO
3
2−
