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

Shinya Iwasaki (), Lester Lembke-Jene, Kana Nagashima, Helge W. Arz, Naomi Harada, Katsunori Kimoto and Frank Lamy
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Shinya Iwasaki: Research Institute for Global Change
Lester Lembke-Jene: Alfred-Wegener-Institut Helmholtz-Zentrum für Polar und Meeresforschung
Kana Nagashima: Research Institute for Global Change
Helge W. Arz: Leibniz Institute for Baltic Sea Research, Warnemünde
Naomi Harada: Research Institute for Global Change
Katsunori Kimoto: Research Institute for Global Change
Frank Lamy: Alfred-Wegener-Institut Helmholtz-Zentrum für Polar und Meeresforschung

Nature Communications, 2022, vol. 13, issue 1, 1-12

Abstract: 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 ([CO32−]). Our subantarctic Southeast Pacific sediment core depth transect shows significant deep-water [CO32−] variations during the Last Glacial Maximum and Deglaciation (10-22 ka BP). We provide evidence for an increase in [CO32−] during the early-deglacial period (15-19 ka BP) in Lower Circumpolar Deepwater. The export of such low-carbon deep-water from the Pacific to the Atlantic contributed to significantly lowered carbon storage within the Southern Ocean, highlighting the importance of a dynamic Pacific-Southern Ocean deep-water reconfiguration for shaping late-glacial oceanic carbon storage, and subsequent deglacial oceanic-atmospheric CO2 transfer.

Date: 2022
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DOI: 10.1038/s41467-022-33753-4

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