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Active nordic seas deep-water formation during the last glacial maximum

Active nordic seas deep-water formation during the last glacial maximum
Active nordic seas deep-water formation during the last glacial maximum
The Nordic Seas are the primary location where the warm waters of the North Atlantic Current densify to form North Atlantic Deep Water, which plays a key part in the modern Atlantic Meridional Overturning Circulation. The formation of dense water in the Nordic Seas and Arctic Ocean and resulting ocean circulation changes were probably driven by and contributed to the regional and global climate of the last glacial maximum (LGM). Here we map the source and degree of mixing of deep water in the Nordic Seas and through the Arctic Gateway (Yermak Plateau) over the past 35 thousand years using neodymium isotopes (εNd) measured on authigenic phases in deep-sea sediments with a high spatial and temporal resolution. We find that a large-scale reorganization of deep-water formation in the Nordic Seas took place between the LGM (23–18 thousand years ago) and the rapid climate shift that accompanied the subsequent deglaciation (18–10 thousand years ago). We show that homogeneous εNd signatures across a wide range of sites support LGM deep-water formation in the Nordic Seas. In contrast, during the deglaciation, disparate and spatially variable εNd values are observed leading to the conclusion that deep-water formation may have been reduced during this time.
1752-0908
925 - 931
Larkin, Christina S.
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Ezat, Mohamed M.
ab4f3a5c-d5cf-4813-86ee-e7c448ffc1ad
Roberts, Natalie L.
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Bauch, Henning A.
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Spielhagen, Robert F.
ace7ee6e-66a2-44c4-80d9-33e916f860d6
Noormets, Riko
bbe280fb-9e62-4893-820b-9bf030ae8d19
Polyak, Leonid
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Moreton, Steven G.
eee3aaf1-9d6c-4fd5-a72c-0aae89de36e8
Rasmussen, Tine L.
9c7d8f2e-210d-46df-8f10-7ff757d8ca22
Sarnthein, Michael
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Tipper, Edward T.
b966fdef-6e38-40dd-b22e-c529f4b974d0
Piotrowski, Alexander M.
9b0f2ed4-4133-4809-a58a-02639f0bba8a
Larkin, Christina S.
7e5477b9-0a3d-4580-ba78-2e6282f010cc
Ezat, Mohamed M.
ab4f3a5c-d5cf-4813-86ee-e7c448ffc1ad
Roberts, Natalie L.
7b7d0807-814b-4d3d-9fad-b23d573d11b1
Bauch, Henning A.
7682c5a4-818d-4b2d-a31c-fcbc06ec1c60
Spielhagen, Robert F.
ace7ee6e-66a2-44c4-80d9-33e916f860d6
Noormets, Riko
bbe280fb-9e62-4893-820b-9bf030ae8d19
Polyak, Leonid
d98748c7-21e7-4850-9ce4-d6cacdb7ba50
Moreton, Steven G.
eee3aaf1-9d6c-4fd5-a72c-0aae89de36e8
Rasmussen, Tine L.
9c7d8f2e-210d-46df-8f10-7ff757d8ca22
Sarnthein, Michael
37d635ab-8783-4724-8d6a-799ab56c4821
Tipper, Edward T.
b966fdef-6e38-40dd-b22e-c529f4b974d0
Piotrowski, Alexander M.
9b0f2ed4-4133-4809-a58a-02639f0bba8a

Larkin, Christina S., Ezat, Mohamed M., Roberts, Natalie L., Bauch, Henning A., Spielhagen, Robert F., Noormets, Riko, Polyak, Leonid, Moreton, Steven G., Rasmussen, Tine L., Sarnthein, Michael, Tipper, Edward T. and Piotrowski, Alexander M. (2022) Active nordic seas deep-water formation during the last glacial maximum. Nature Geoscience, 15, 925 - 931. (doi:10.1038/s41561- 022-01050-w).

Record type: Article

Abstract

The Nordic Seas are the primary location where the warm waters of the North Atlantic Current densify to form North Atlantic Deep Water, which plays a key part in the modern Atlantic Meridional Overturning Circulation. The formation of dense water in the Nordic Seas and Arctic Ocean and resulting ocean circulation changes were probably driven by and contributed to the regional and global climate of the last glacial maximum (LGM). Here we map the source and degree of mixing of deep water in the Nordic Seas and through the Arctic Gateway (Yermak Plateau) over the past 35 thousand years using neodymium isotopes (εNd) measured on authigenic phases in deep-sea sediments with a high spatial and temporal resolution. We find that a large-scale reorganization of deep-water formation in the Nordic Seas took place between the LGM (23–18 thousand years ago) and the rapid climate shift that accompanied the subsequent deglaciation (18–10 thousand years ago). We show that homogeneous εNd signatures across a wide range of sites support LGM deep-water formation in the Nordic Seas. In contrast, during the deglaciation, disparate and spatially variable εNd values are observed leading to the conclusion that deep-water formation may have been reduced during this time.

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Accepted/In Press date: 13 September 2022
Published date: 24 October 2022

Identifiers

Local EPrints ID: 471742
URI: http://eprints.soton.ac.uk/id/eprint/471742
ISSN: 1752-0908
PURE UUID: 7f2b763d-18e9-4b26-9b46-6f6ee1e26c84
ORCID for Christina S. Larkin: ORCID iD orcid.org/0000-0002-6420-0461

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Date deposited: 17 Nov 2022 17:40
Last modified: 17 Mar 2024 07:34

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Contributors

Author: Christina S. Larkin ORCID iD
Author: Mohamed M. Ezat
Author: Natalie L. Roberts
Author: Henning A. Bauch
Author: Robert F. Spielhagen
Author: Riko Noormets
Author: Leonid Polyak
Author: Steven G. Moreton
Author: Tine L. Rasmussen
Author: Michael Sarnthein
Author: Edward T. Tipper
Author: Alexander M. Piotrowski

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