Timing and nature of AMOC recovery across Termination 2 and magnitude of deglacial CO2 change
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Published version
Author(s)
Deaney, EL
Barker, S
van de Flierdt, T
Type
Journal Article
Abstract
Large amplitude variations in atmospheric CO
2
were associated with glacial terminations
of the Late Pleistocene. Here we provide multiple lines of evidence suggesting that the
B
20 p.p.m.v. overshoot in CO
2
at the end of Termination 2 (T2)
B
129 ka was associated with
an abrupt (
r
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 CO
2
, we suggest that the net change in CO
2
across the
last 2 terminations was approximately equal if the transient effects of deglacial oscillations in
ocean circulation are taken into account.
2
were associated with glacial terminations
of the Late Pleistocene. Here we provide multiple lines of evidence suggesting that the
B
20 p.p.m.v. overshoot in CO
2
at the end of Termination 2 (T2)
B
129 ka was associated with
an abrupt (
r
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 CO
2
, we suggest that the net change in CO
2
across the
last 2 terminations was approximately equal if the transient effects of deglacial oscillations in
ocean circulation are taken into account.
Date Issued
2017-02-27
Date Acceptance
2017-01-17
Citation
Nature Communications, 2017, 8
ISSN
2041-1723
Publisher
Nature Publishing Group
Journal / Book Title
Nature Communications
Volume
8
Copyright Statement
© The Author(s) 2017. This work is licensed under a Creative Commons Attribution 4.0
International License. The images or other third party material in this
article are included in the article’s Creative Commons license, unless indicated otherwise
in the credit line; if the material is not included under the Creative Commons license,
users will need to obtain permission from the license holder to reproduce the material.
To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
International License. The images or other third party material in this
article are included in the article’s Creative Commons license, unless indicated otherwise
in the credit line; if the material is not included under the Creative Commons license,
users will need to obtain permission from the license holder to reproduce the material.
To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Sponsor
Natural Environment Research Council (NERC)
Natural Environment Research Council (NERC)
Grant Number
NE/J021636/1
NE/N001141/1
Subjects
Science & Technology
Multidisciplinary Sciences
Science & Technology - Other Topics
OCEAN CIRCULATION CHANGES
LAST INTERGLACIAL PERIOD
PAST 800,000 YEARS
ATMOSPHERIC CO2
GLACIAL CYCLES
DEEP-SEA
PENULTIMATE DEGLACIATION
OVERTURNING CIRCULATION
CLIMATE VARIABILITY
BIPOLAR SEESAW
MD Multidisciplinary
Publication Status
Published
Article Number
14595