Northward shift of the southern westerlies during the Antarctic Cold Reversal

M.-S. Fletcher*, J. Pedro, T. Hall, M. Mariani, J.A. Alexander, K. Beck, Maarten Blaauw, D. Hodgson, H. Heijnis, P. Gadd, Agathe Lisé-Pronovost

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Inter-hemispheric asynchrony of climate change through the last deglaciation has been theoretically linked to latitudinal shifts in the southern westerlies via their influence over CO 2 out-gassing from the Southern Ocean. Proxy-based reconstructions disagree on the behaviour of the westerlies through this interval. The last deglaciation was interrupted in the Southern Hemisphere by the Antarctic Cold Reversal (ACR; 14.7 to 13.0 ka BP (thousand years Before Present)), a millennial-scale cooling event that coincided with the Bølling–Allerød warm phase in the North Atlantic (BA; 14.7 to 12.7 ka BP). We present terrestrial proxy palaeoclimate data that demonstrate a migration of the westerlies during the last deglaciation. We support the hypothesis that wind-driven out-gassing of old CO2 from the Southern Ocean drove the deglacial rise in atmospheric CO2.
Original languageEnglish
JournalQuaternary Science Reviews
Publication statusAccepted - 14 Sep 2021

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