Northward shift of the southern westerlies during the Antarctic Cold Reversal

Fletcher, Michael-Shawn; Pedro, Joel; Hall, Tegan; Mariani, Michela; Alexander, Joseph A.; Beck, Kristen; Blaauw, Maarten; Hodgson, Dominic A. ORCID:; Heijnis, Henk; Gadd, Patricia S.; Lisé-Pronovost, Agathe. 2021 Northward shift of the southern westerlies during the Antarctic Cold Reversal. Quaternary Science Reviews, 271, 107189. 7, pp.

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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 CO2 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.

Item Type: Publication - Article
Digital Object Identifier (DOI):
ISSN: 0277-3791
Additional Keywords: Antarctic cold reversal; Tasmania; Carbon cycle; Southern ocean; Pollen; Charcoal; Southern hemisphere
Date made live: 30 Sep 2021 08:54 +0 (UTC)

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