Northward shift of the southern westerlies during the Antarctic Cold Reversal

Fletcher, Michael-Shawn; Pedro, Joel; Hall, Tegan; Mariani, Michela; Joseph, Alexander; Beck, Kristen; Blaauw, Maarten; Hodgson, Dominic; Heijnis, Henk; Gadd, Patricia; Lise-Pronovost, Agathe

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 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.

Citation

Fletcher, M.-S., Pedro, J., Hall, T., Mariani, M., Joseph, A., Beck, K., Blaauw, M., Hodgson, D., Heijnis, H., Gadd, P., & Lise-Pronovost, A. (2021). Northward shift of the southern westerlies during the Antarctic Cold Reversal. Quaternary Science Reviews, 271, Article 107189. https://doi.org/10.1016/j.quascirev.2021.107189

• Journal Article Type: Article
• Acceptance Date: Sep 5, 2021
• Online Publication Date: Sep 23, 2021
• Publication Date: Nov 1, 2021
• Deposit Date: Sep 22, 2021
• Publicly Available Date: Sep 24, 2022
• Journal: Quaternary Science Reviews
• Print ISSN: 0277-3791
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 271
• Article Number: 107189
• DOI: https://doi.org/10.1016/j.quascirev.2021.107189
• Keywords: Geology; Archeology; Archeology; Ecology, Evolution, Behavior and Systematics; Global and Planetary Change
• Public URL: https://nottingham-repository.worktribe.com/output/6296098
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0277379121003966