Relative Timing of Deglacial Climate Events in Antarctica and Greenland
journal contribution
posted on 2023-05-16, 14:00authored byMorgan, VI, Delmotte, M, Tasman van OmmenTasman van Ommen, Jouzel, J, Chappellaz, J, Woon, S, Masson-Delmotte, V, Raynaud, D
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.
History
Publication title
Science
Volume
297
Issue
5588
Pagination
1862-1864
ISSN
0036-8075
Department/School
Institute for Marine and Antarctic Studies
Publisher
American Association for the Advancement of Science