Northward shift of the southern westerlies during the Antarctic Cold Reversal

Fletcher, Michael-Shawn, Pedro, Joel, Hall, Tegan , Mariani, Michela, Alexander, Joseph, Beck, Kristen K., Blaauw, Maarten, Hodgson, Dominic, Heijnis, Henk, Gadd, Patricia S. and Lise-Pronovost, Agathe (2021) Northward shift of the southern westerlies during the Antarctic Cold Reversal. Quaternary Science Reviews, 271 . p. 107189. ISSN 0277-3791

Full content URL: https://doi.org/10.1016/j.quascirev.2021.107189

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Northward shift of the southern westerlies during the Antarctic Cold Reversal
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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 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 BøllingeAllerød 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.

Keywords:Antarctic cold reversal, Tasmania, carbon cycle, Southern Ocean, pollen, charcoal, Southern Hemisphere
Subjects:F Physical Sciences > F640 Earth Science
F Physical Sciences > F860 Climatology
F Physical Sciences > F643 Quaternary studies
F Physical Sciences > F642 Geoscience
Divisions:College of Science > School of Geography
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ID Code:46616
Deposited On:06 Oct 2021 10:31

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