Evolving southwest African response to abrupt deglacial North Atlantic climate change events

International audience Climate change during the last deglaciation was strongly influenced by the 'bipolar seesaw', producing antiphase climate responses between the North and South Atlantic. However, mounting evidence demands refinements of this model, with the occurrence of abrupt events...

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Bibliographic Details
Published in:Quaternary Science Reviews
Main Authors: Chase, Brian, Boom, Arnoud, Carré, Andrew S., Carr, Matthieu, Chevalier, Manuel, Meadows, Michael E., Pedro, Joel B., Stager, J.Curt, Reimer, Paula J.
Other Authors: Institut des Sciences de l'Evolution de Montpellier (UMR ISEM), École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre National de la Recherche Scientifique (CNRS)-Institut de recherche pour le développement IRD : UR226, European Project: 258657,EC:FP7:ERC,ERC-2010-StG_20091028,HYRAX(2010)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2015
Subjects:
Southern Africa
Palaeoclimate
Hyrax middens
Bipolar seesaw
Atlantic overturning meridional circulation
[SDE.MCG]Environmental Sciences/Global Changes
North Atlantic
Online Access:https://hal.umontpellier.fr/hal-01817611
https://doi.org/10.1016/j.quascirev.2015.05.023
Description
Summary:International audience Climate change during the last deglaciation was strongly influenced by the 'bipolar seesaw', producing antiphase climate responses between the North and South Atlantic. However, mounting evidence demands refinements of this model, with the occurrence of abrupt events in southern low to mid latitudes occurring in-phase with North Atlantic climate. Improved constraints on the northesouth phasing and spatial extent of these events are therefore critical to understanding the mechanisms that propagate abrupt events within the climate system. We present a 19,400 year multi-proxy record of climate change obtained from a rock hyrax midden in southernmost Africa. Arid anomalies in phase with the Younger Dryas and 8.2 ka events are apparent, indicating a clear shift in the influence of the bipolar seesaw, which diminished as the Earth warmed, and was succeeded after ~14.6 ka by the emergence of a dominant interhemispheric atmospheric teleconnection.

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