The southward migration of the Antarctic Circumpolar Current enhanced oceanic degassing of carbon dioxide during the last two deglaciations - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Communications Earth & Environment Année : 2024

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

Résumé

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.
Fichier principal
Vignette du fichier
s43247-024-01216-x.pdf (2.32 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-04426496 , version 1 (30-01-2024)

Identifiants

Citer

Xuyuan E Ai, Alexandra Auderset, Mareike Schmitt, Simone Moretti, Anja S Studer, et al.. The southward migration of the Antarctic Circumpolar Current enhanced oceanic degassing of carbon dioxide during the last two deglaciations. Communications Earth & Environment, 2024, 5 (1), pp.58. ⟨10.1038/s43247-024-01216-x⟩. ⟨hal-04426496⟩
19 Consultations
2 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More