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 oce...
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ftunivcam:oai:www.repository.cam.ac.uk:1810/349216 2024-01-14T10:04:34+01:00 Active Nordic Seas deep-water formation during the last glacial maximum Piotrowski, Alexander Larkin, Christina 2022-12-09T14:32:27Z application/pdf https://www.repository.cam.ac.uk/handle/1810/349216 eng eng Nature Research Department of Earth Sciences http://dx.doi.org/10.1038/s41561-022-01050-w Nature Geoscience https://www.repository.cam.ac.uk/handle/1810/349216 Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ 37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3705 Geology 14 Life Below Water Article 2022 ftunivcam 2023-12-21T23:19:11Z 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 likely 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 last 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 reorganisation 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. Deep-water formation processes in the Nordic Seas regulate the global climate via the redistribution of heat by the surface ocean and the capacity of the deep ocean to store carbon 1 . At present the Atlantic Meridional Overturning Circulation (AMOC) links polar and sub-polar climate with the formation of North Atlantic Deep Water (NADW), a major component of the global oceanic thermohaline circulation. The densest northern-sourced waters in the modern AMOC are formed in the Nordic Seas, primarily by deep convection and gradual transformation of North Atlantic surface waters2 . NERC studentship (NE/L002507/1), with support from Murray Edwards College and the Geological Society’s Elspeth Matthews Fund. Article in Journal/Newspaper Arctic Arctic Ocean NADW Nordic Seas north atlantic current North Atlantic Deep Water North Atlantic Yermak plateau Apollo - University of Cambridge Repository Arctic Arctic Ocean Yermak Plateau ENVELOPE(5.000,5.000,81.250,81.250) |
institution |
Open Polar |
collection |
Apollo - University of Cambridge Repository |
op_collection_id |
ftunivcam |
language |
English |
topic |
37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3705 Geology 14 Life Below Water |
spellingShingle |
37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3705 Geology 14 Life Below Water Piotrowski, Alexander Larkin, Christina Active Nordic Seas deep-water formation during the last glacial maximum |
topic_facet |
37 Earth Sciences 3709 Physical Geography and Environmental Geoscience 3705 Geology 14 Life Below Water |
description |
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 likely 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 last 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 reorganisation 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. Deep-water formation processes in the Nordic Seas regulate the global climate via the redistribution of heat by the surface ocean and the capacity of the deep ocean to store carbon 1 . At present the Atlantic Meridional Overturning Circulation (AMOC) links polar and sub-polar climate with the formation of North Atlantic Deep Water (NADW), a major component of the global oceanic thermohaline circulation. The densest northern-sourced waters in the modern AMOC are formed in the Nordic Seas, primarily by deep convection and gradual transformation of North Atlantic surface waters2 . NERC studentship (NE/L002507/1), with support from Murray Edwards College and the Geological Society’s Elspeth Matthews Fund. |
format |
Article in Journal/Newspaper |
author |
Piotrowski, Alexander Larkin, Christina |
author_facet |
Piotrowski, Alexander Larkin, Christina |
author_sort |
Piotrowski, Alexander |
title |
Active Nordic Seas deep-water formation during the last glacial maximum |
title_short |
Active Nordic Seas deep-water formation during the last glacial maximum |
title_full |
Active Nordic Seas deep-water formation during the last glacial maximum |
title_fullStr |
Active Nordic Seas deep-water formation during the last glacial maximum |
title_full_unstemmed |
Active Nordic Seas deep-water formation during the last glacial maximum |
title_sort |
active nordic seas deep-water formation during the last glacial maximum |
publisher |
Nature Research |
publishDate |
2022 |
url |
https://www.repository.cam.ac.uk/handle/1810/349216 |
long_lat |
ENVELOPE(5.000,5.000,81.250,81.250) |
geographic |
Arctic Arctic Ocean Yermak Plateau |
geographic_facet |
Arctic Arctic Ocean Yermak Plateau |
genre |
Arctic Arctic Ocean NADW Nordic Seas north atlantic current North Atlantic Deep Water North Atlantic Yermak plateau |
genre_facet |
Arctic Arctic Ocean NADW Nordic Seas north atlantic current North Atlantic Deep Water North Atlantic Yermak plateau |
op_relation |
https://www.repository.cam.ac.uk/handle/1810/349216 |
op_rights |
Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ |
_version_ |
1788059071327240192 |