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

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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
Article number107189
Number of pages7
JournalQuaternary Science Reviews
Volume271
Early online date23 Sept 2021
DOIs
Publication statusPublished - 01 Nov 2021

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