TY - JOUR T1 - Glacial heterogeneity in Southern Ocean carbon storage abated by fast South Indian deglacial carbon release A1 - Gottschalk,Julia A1 - Michel,Elisabeth A1 - Thöle,Lena M. A1 - Studer,Anja S. A1 - Hasenfratz,Adam P. A1 - Schmid,Nicole A1 - Butzin,Martin A1 - Mazaud,Alain A1 - Martínez-García,Alfredo A1 - Szidat,Sönke A1 - Jaccard,Samuel L. AD - Institute of Geological Sciences and Oeschger Center for Climate Change Research, University of Bern, Bern, Switzerland AD - Lamont-Doherty Earth Observatory, Columbia University of the City of New York, Palisades, NY, USA AD - Laboratoire des Sciences du Climat et de l’Environnement, LSCE/IPSL, CNRS-CEA-UVSQ, Université de Paris-Saclay, Gif-sur-Yvette, France AD - Department of Earth Sciences, Marine Palynology and Paleoceanography, Utrecht University, Utrecht, Netherlands AD - Max Planck Institute for Chemistry, Climate Geochemistry Department, Mainz, Germany AD - Department of Environmental Sciences, University of Basel, Basel, Switzerland AD - Geological Institute, Department of Earth Sciences, ETH Zurich, Zurich, Switzerland AD - Alfred-Wegener-Institut Helmholtz-Zentrum für Polar-und Meeresforschung, Bremerhaven, Germany AD - Department of Chemistry and Biochemistry and Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland UR - https://archimer.ifremer.fr/doc/00662/77418/ DO - 10.1038/s41467-020-20034-1 N2 - Past changes in ocean 14C disequilibria have been suggested to reflect the Southern Ocean control on global exogenic carbon cycling. Yet, the volumetric extent of the glacial carbon pool and the deglacial mechanisms contributing to release remineralized carbon, particularly from regions with enhanced mixing today, remain insufficiently constrained. Here, we reconstruct the deglacial ventilation history of the South Indian upwelling hotspot near Kerguelen Island, using high-resolution 14C-dating of smaller-than-conventional foraminiferal samples and multi-proxy deep-ocean oxygen estimates. We find marked regional differences in Southern Ocean overturning with distinct South Indian fingerprints on (early de-)glacial atmospheric CO2 change. The dissipation of this heterogeneity commenced 14.6 kyr ago, signaling the onset of modern-like, strong South Indian Ocean upwelling, likely promoted by rejuvenated Atlantic overturning. Our findings highlight the South Indian Ocean’s capacity to influence atmospheric CO2 levels and amplify the impacts of inter-hemispheric climate variability on global carbon cycling within centuries and millennia. Y1 - 2020/12 PB - Springer Science and Business Media LLC JF - Nature Communications SN - 2041-1723 VL - 11 IS - 1 ID - 77418 ER -