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Rapid global ocean-atmosphere response to Southern Ocean freshening during the last glacial

Rapid global ocean-atmosphere response to Southern Ocean freshening during the last glacial
Rapid global ocean-atmosphere response to Southern Ocean freshening during the last glacial
Contrasting Greenland and Antarctic temperatures during the last glacial period (115,000 to 11,650 years ago) are thought to have been driven by imbalances in the rates of formation of North Atlantic and Antarctic Deep Water (the 'bipolar seesaw'). Here we exploit a bidecadally resolved 14C data set obtained from New Zealand kauri (Agathis australis) to undertake high-precision alignment of key climate data sets spanning iceberg-rafted debris event Heinrich 3 and Greenland Interstadial (GI) 5.1 in the North Atlantic (~30,400 to 28,400 years ago). We observe no divergence between the kauri and Atlantic marine sediment 14C data sets, implying limited changes in deep water formation. However, a Southern Ocean (Atlantic-sector) iceberg rafted debris event appears to have occurred synchronously with GI-5.1 warming and decreased precipitation over the western equatorial Pacific and Atlantic. An ensemble of transient meltwater simulations shows that Antarctic-sourced salinity anomalies can generate climate changes that are propagated globally via an atmospheric Rossby wave train.
2041-1723
Turney, Chris S.M.
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Jones, Richard T.
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Phipps, Steven J.
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Thomas, Zoë
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Hogg, Alan
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Kershaw, A. Peter
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Fogwill, Christopher J.
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Palmer, Jonathan
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Bronk Ramsey, Christopher
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Adolphi, Florian
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Muscheler, Raimund
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Hughen, Konrad A.
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Staff, Richard A.
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Grosvenor, Mark
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Golledge, Nicholas R.
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Rasmussen, Sune Olander
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Hutchinson, David K.
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Haberle, Simon
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Lorrey, Andrew
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Boswijk, Gretel
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Cooper, Alan
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et al.
Turney, Chris S.M.
5149b57c-77c2-4375-97a2-a4f00aa74d97
Jones, Richard T.
f8b5db51-10c7-4b4e-81e3-e5c3833eb2ce
Phipps, Steven J.
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Thomas, Zoë
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Hogg, Alan
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Kershaw, A. Peter
5f1c43e4-49ae-40c2-966a-05bb34cf5bc2
Fogwill, Christopher J.
3bad6ae9-5a6d-467e-b523-9d5ed0147455
Palmer, Jonathan
6b327a39-f234-4cdc-ae73-0c48340f05b3
Bronk Ramsey, Christopher
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Adolphi, Florian
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Muscheler, Raimund
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Hughen, Konrad A.
f7b3b803-edd7-46b4-bc7a-0bf2bf380f62
Staff, Richard A.
d86a5639-c8ae-49f7-ba7c-3c6e014c27d0
Grosvenor, Mark
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Golledge, Nicholas R.
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Rasmussen, Sune Olander
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Hutchinson, David K.
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Haberle, Simon
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Lorrey, Andrew
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Boswijk, Gretel
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Cooper, Alan
8dddc248-aaaa-41d3-bd4c-b66a482c6e69

Turney, Chris S.M., Jones, Richard T., Phipps, Steven J. and Thomas, Zoë , et al. (2017) Rapid global ocean-atmosphere response to Southern Ocean freshening during the last glacial. Nature Communications, 8 (1), [520]. (doi:10.1038/s41467-017-00577-6).

Record type: Article

Abstract

Contrasting Greenland and Antarctic temperatures during the last glacial period (115,000 to 11,650 years ago) are thought to have been driven by imbalances in the rates of formation of North Atlantic and Antarctic Deep Water (the 'bipolar seesaw'). Here we exploit a bidecadally resolved 14C data set obtained from New Zealand kauri (Agathis australis) to undertake high-precision alignment of key climate data sets spanning iceberg-rafted debris event Heinrich 3 and Greenland Interstadial (GI) 5.1 in the North Atlantic (~30,400 to 28,400 years ago). We observe no divergence between the kauri and Atlantic marine sediment 14C data sets, implying limited changes in deep water formation. However, a Southern Ocean (Atlantic-sector) iceberg rafted debris event appears to have occurred synchronously with GI-5.1 warming and decreased precipitation over the western equatorial Pacific and Atlantic. An ensemble of transient meltwater simulations shows that Antarctic-sourced salinity anomalies can generate climate changes that are propagated globally via an atmospheric Rossby wave train.

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More information

Accepted/In Press date: 7 July 2017
Published date: 1 December 2017
Additional Information: Funding Information: This work was funded by the Australian Research Council (FL100100195, DP170104665 and SR140300001) and the Natural Environment Research Council (NE/H009922/1 and NE/H007865/1). We thank Dr Charlotte Cook and Dr Sarah Kelloway for helping to process the Lynch’s Crater samples, and Dr Christo Buizert for calculating the WD2014syncchronology. Publisher Copyright: © 2017 The Author(s).

Identifiers

Local EPrints ID: 476112
URI: http://eprints.soton.ac.uk/id/eprint/476112
ISSN: 2041-1723
PURE UUID: 569fd6b2-c8df-45e3-8478-f0086c97a906
ORCID for Zoë Thomas: ORCID iD orcid.org/0000-0002-2323-4366

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Date deposited: 12 Apr 2023 14:21
Last modified: 06 Jun 2024 02:16

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Contributors

Author: Chris S.M. Turney
Author: Richard T. Jones
Author: Steven J. Phipps
Author: Zoë Thomas ORCID iD
Author: Alan Hogg
Author: A. Peter Kershaw
Author: Christopher J. Fogwill
Author: Jonathan Palmer
Author: Christopher Bronk Ramsey
Author: Florian Adolphi
Author: Raimund Muscheler
Author: Konrad A. Hughen
Author: Richard A. Staff
Author: Mark Grosvenor
Author: Nicholas R. Golledge
Author: Sune Olander Rasmussen
Author: David K. Hutchinson
Author: Simon Haberle
Author: Andrew Lorrey
Author: Gretel Boswijk
Author: Alan Cooper
Corporate Author: et al.

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