Glacial heterogeneity in Southern Ocean carbon storage abated by fast South Indian deglacial carbon release

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Version: Final published version
License: CC BY 4.0
Serval ID
serval:BIB_50858AB47DE8
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Glacial heterogeneity in Southern Ocean carbon storage abated by fast South Indian deglacial carbon release
Journal
Nature Communications
Author(s)
Gottschalk Julia, Michel Elisabeth, Thöle Lena M., Studer Anja S., Hasenfratz Adam P., Schmid Nicole, Butzin Martin, Mazaud Alain, Martínez-García Alfredo, Szidat Sönke, Jaccard Samuel L.
ISSN
2041-1723
Publication state
Published
Issued date
12/2020
Peer-reviewed
Oui
Volume
11
Number
1
Pages
6192
Language
english
Abstract
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.
Keywords
Biogeochemistry, Carbon cycle, Climate change, Palaeoceanography, Palaeoclimate
Open Access
Yes
Funding(s)
Swiss National Science Foundation / Careers / PP00P2_144811
Swiss National Science Foundation / Projects / 200021_163003
Create date
04/12/2020 15:53
Last modification date
13/07/2024 7:14
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