Northward shift of the southern westerlies during the Antarctic Cold Reversal

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 throug...

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Bibliographic Details
Published in:Quaternary Science Reviews
Main Authors: Fletcher, M-S, Pedro, J, Hall, T, Mariani, M, Alexander, JA, Beck, K, Blaauw, M, Hodgson, DA, Heijnis, H, Gadd, PS, Lise-Pronovos, A
Format: Article in Journal/Newspaper
Language:unknown
Published: Elsevier Ltd 2021
Subjects:
Antarctic cold reversal
Tasmania
Carbon cycle
Southern ocean
Pollen
Charcoal
Southern hemisphere
Antarctic
Southern Ocean
The Antarctic
Antarc*
North Atlantic
Online Access:https://eprints.utas.edu.au/47367/
Description
Summary: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 Bøllinge-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.

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