The southward migration of the Antarctic Circumpolar Current enhanced oceanic degassing of carbon dioxide during the last two deglaciations

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State: Public
Version: Final published version
License: CC BY 4.0
Serval ID
serval:BIB_4EF79FDF0D05
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
The southward migration of the Antarctic Circumpolar Current enhanced oceanic degassing of carbon dioxide during the last two deglaciations
Journal
Communications Earth & Environment
Author(s)
Ai Xuyuan E., Thöle Lena M., Auderset Alexandra, Schmitt Mareike, Moretti Simone, Studer Anja S., Michel Elisabeth, Wegmann Martin, Mazaud Alain, Bijl Peter K., Sigman Daniel M., Martínez-García Alfredo, Jaccard Samuel L.
ISSN
2662-4435
Publication state
Published
Issued date
30/01/2024
Peer-reviewed
Oui
Volume
5
Number
1
Language
english
Abstract
Previous studies suggest that meridional migrations of the Antarctic Circumpolar Current may have altered wind-driven upwelling and carbon dioxide degassing in the Southern Ocean during past climate transitions. Here, we report a quantitative and continuous record of the Antarctic Circumpolar Current latitude over the last glacial-interglacial cycle, using biomarker-based reconstructions of surface layer temperature gradient in the southern Indian Ocean. The results show that the Antarctic Circumpolar Current was more equatorward during the ice ages and shifted ~6° poleward at the end of glacial terminations, consistent with Antarctic Circumpolar Current migration playing a role in glacial-interglacial atmospheric carbon dioxide change. Comparing the temporal evolution of the Antarctic Circumpolar Current mean latitude with other observations provides evidence that Earth’s axial tilt affects the strength and latitude range of Southern Ocean wind-driven upwelling, which may explain previously noted deviations in atmospheric carbon dioxide concentration from a simple correlation with Antarctic climate.
Keywords
Palaeoceanography, Palaeoclimate
Open Access
Yes
Funding(s)
Swiss National Science Foundation / PP00P2_144811
Swiss National Science Foundation / PP00P2_172915
Swiss National Science Foundation
Create date
31/01/2024 10:52
Last modification date
12/07/2024 7:11
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