Evidence for late-glacial oceanic carbon redistribution and discharge from the Pacific Southern Ocean.

ABSTRACT: Southern Ocean deep-water circulation plays a vital role in the global carbon cycle. On geological time scales, upwelling along the Chilean margin likely contributed to the deglacial atmospheric carbon dioxide rise, but little quantitative evidence exists of carbon storage. Here, we develop an X-ray Micro-Computer-Tomography method to assess foraminiferal test dissolution as proxy for paleo-carbonate ion concentrations ([CO₃^2-]). Our subantarctic Southeast Pacific sediment core depth transect shows significant deep-water [CO₃^2-] variations during the Last Glacial Maximum and Deglaciation (10-22 ka BP). We provide evidence for an increase in [CO₃^2-] during the early-deglacial period (15-19 ka BP) in Lower Circumpolar Deepwate

SUBMITTER: Iwasaki S 

PROVIDER: S-EPMC9652385 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature