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Timing and nature of AMOC recovery across Termination 2 and magnitude of deglacial CO2 change

Deaney, Emily L, Barker, Stephen and Van de Flierdt, Tina 2017. Timing and nature of AMOC recovery across Termination 2 and magnitude of deglacial CO2 change. Nature Communications 8 , 14595. 10.1038/NCOMMS14595

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Abstract

Large amplitude variations in atmospheric CO2 were associated with glacial terminations of the Late Pleistocene. Here we provide multiple lines of evidence suggesting that the ∼20 p.p.m.v. overshoot in CO2 at the end of Termination 2 (T2) ∼129 ka was associated with an abrupt (≤400 year) deepening of Atlantic Meridional Overturning Circulation (AMOC). In contrast to Termination 1 (T1), which was interrupted by the Bølling-Allerød (B-A), AMOC recovery did not occur until the very end of T2, and was characterized by pronounced formation of deep waters in the NW Atlantic. Considering the variable influences of ocean circulation change on atmospheric CO2, we suggest that the net change in CO2 across the last 2 terminations was approximately equal if the transient effects of deglacial oscillations in ocean circulation are taken into account.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: G Geography. Anthropology. Recreation > GC Oceanography
Publisher: Nature Publishing Group
ISSN: 2041-1723
Funders: NERC
Date of First Compliant Deposit: 27 February 2017
Date of Acceptance: 17 January 2017
Last Modified: 06 Sep 2017 09:08
URI: http://orca.cf.ac.uk/id/eprint/98596

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