Relative timing of deglacial climate events in Antarctica and Greenland

The last deglaciation was marked by large, hemispheric, millennial-scale climate variations: the Bølling-Allerød and Younger Dryas periods in the north, and the Antarctic Cold Reversal in the south. A chronology from the high-accumulation Law Dome East Antarctic ice core constrains the relative timi...

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Bibliographic Details
Published in:Science
Main Authors: Morgan, V., Delmotte, M., van Ommen, T., Jouzel, J., Chappellaz, J., Woon, S., Masson-Delmotte, V., Raynaud, D.
Format: Text
Language:unknown
Published: Washington, American Association for the Advancement of Science (AAAS) 2022
Subjects:
Antarctic
Greenland
Law Dome
The Antarctic
Antarc*
Antarctica
ice core
North Atlantic
North atlantic Thermohaline circulation
Online Access:https://doi.org/10.1126/science.1074257
http://infoscience.epfl.ch/record/298373
Description
Summary:The last deglaciation was marked by large, hemispheric, millennial-scale climate variations: the Bølling-Allerød and Younger Dryas periods in the north, and the Antarctic Cold Reversal in the south. A chronology from the high-accumulation Law Dome East Antarctic ice core constrains the relative timing of these two events and provides strong evidence that the cooling at the start of the Antarctic Cold Reversal did not follow the abrupt warming during the northern Boiling transition around 14,500 years ago. This result suggests that southern changes are not a direct response to abrupt changes in North Atlantic thermohaline circulation, as is assumed in the conventional picture of a hemispheric temperature seesaw.

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