Historical reconstruction of subpolar north Atlantic overturning and its relationship to density
The connections between the overturning of the subpolar North Atlantic and regional density changes are assessed on interannual and decadal timescales using historical, data-based reconstructions of the overturning over the last 60 years and forward model integrations with buoyancy and wind forcing....
Published in: | Journal of Geophysical Research: Oceans |
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2022
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Online Access: | http://nora.nerc.ac.uk/id/eprint/532954/ https://nora.nerc.ac.uk/id/eprint/532954/1/JGR%20Oceans%20-%202022%20-%20Roussenov%20-%20Historical%20Reconstruction%20of%20Subpolar%20North%20Atlantic%20Overturning%20and%20Its%20Relationship%20to.pdf https://doi.org/10.1029/2021JC017732 |
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ftnerc:oai:nora.nerc.ac.uk:532954 2023-05-15T17:06:01+02:00 Historical reconstruction of subpolar north Atlantic overturning and its relationship to density Roussenov, Vassil M. Williams, Richard G. Lozier, M. Susan Holliday, N. Penny Smith, Doug M. 2022-05-29 text http://nora.nerc.ac.uk/id/eprint/532954/ https://nora.nerc.ac.uk/id/eprint/532954/1/JGR%20Oceans%20-%202022%20-%20Roussenov%20-%20Historical%20Reconstruction%20of%20Subpolar%20North%20Atlantic%20Overturning%20and%20Its%20Relationship%20to.pdf https://doi.org/10.1029/2021JC017732 en eng https://nora.nerc.ac.uk/id/eprint/532954/1/JGR%20Oceans%20-%202022%20-%20Roussenov%20-%20Historical%20Reconstruction%20of%20Subpolar%20North%20Atlantic%20Overturning%20and%20Its%20Relationship%20to.pdf Roussenov, Vassil M.; Williams, Richard G.; Lozier, M. Susan; Holliday, N. Penny orcid:0000-0002-9733-8002 Smith, Doug M. 2022 Historical reconstruction of subpolar north Atlantic overturning and its relationship to density. Journal of Geophysical Research: Oceans, 127 (6). https://doi.org/10.1029/2021JC017732 <https://doi.org/10.1029/2021JC017732> cc_by_4 CC-BY Publication - Article PeerReviewed 2022 ftnerc https://doi.org/10.1029/2021JC017732 2023-02-04T19:53:25Z The connections between the overturning of the subpolar North Atlantic and regional density changes are assessed on interannual and decadal timescales using historical, data-based reconstructions of the overturning over the last 60 years and forward model integrations with buoyancy and wind forcing. The data-based reconstructions reveal a dominant eastern basin contribution to the subpolar overturning in density space and changes in the overturning reaching ±2.5 Sv, which are both in accord with the Overturning in the Subpolar North Atlantic Program (OSNAP). The zonally integrated geostrophic velocity across the basin is connected to boundary contrasts in Montgomery potential in density space. The overturning for the eastern side of the basin is strongly correlated with density changes in the Irminger and Labrador Seas, while the overturning for the western side is correlated with boundary density changes in the Labrador Sea. These boundary density signals are a consequence of local atmospheric forcing and transport of upstream density changes. In forward model experiments, a localized density increase over the Irminger Sea increases the overturning over both sides of the basin due to dense waters spreading to the Labrador Sea. Conversely, a localized density increase over the Labrador Sea only increases the overturning for the western basin and instead eventually decreases the overturning for the eastern basin. Labrador Sea density provides a useful overturning metric by its direct control of the overturning over the western side and lower latitudes of the subpolar basin. Article in Journal/Newspaper Labrador Sea North Atlantic Natural Environment Research Council: NERC Open Research Archive Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) Western Basin Journal of Geophysical Research: Oceans 127 6 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
The connections between the overturning of the subpolar North Atlantic and regional density changes are assessed on interannual and decadal timescales using historical, data-based reconstructions of the overturning over the last 60 years and forward model integrations with buoyancy and wind forcing. The data-based reconstructions reveal a dominant eastern basin contribution to the subpolar overturning in density space and changes in the overturning reaching ±2.5 Sv, which are both in accord with the Overturning in the Subpolar North Atlantic Program (OSNAP). The zonally integrated geostrophic velocity across the basin is connected to boundary contrasts in Montgomery potential in density space. The overturning for the eastern side of the basin is strongly correlated with density changes in the Irminger and Labrador Seas, while the overturning for the western side is correlated with boundary density changes in the Labrador Sea. These boundary density signals are a consequence of local atmospheric forcing and transport of upstream density changes. In forward model experiments, a localized density increase over the Irminger Sea increases the overturning over both sides of the basin due to dense waters spreading to the Labrador Sea. Conversely, a localized density increase over the Labrador Sea only increases the overturning for the western basin and instead eventually decreases the overturning for the eastern basin. Labrador Sea density provides a useful overturning metric by its direct control of the overturning over the western side and lower latitudes of the subpolar basin. |
format |
Article in Journal/Newspaper |
author |
Roussenov, Vassil M. Williams, Richard G. Lozier, M. Susan Holliday, N. Penny Smith, Doug M. |
spellingShingle |
Roussenov, Vassil M. Williams, Richard G. Lozier, M. Susan Holliday, N. Penny Smith, Doug M. Historical reconstruction of subpolar north Atlantic overturning and its relationship to density |
author_facet |
Roussenov, Vassil M. Williams, Richard G. Lozier, M. Susan Holliday, N. Penny Smith, Doug M. |
author_sort |
Roussenov, Vassil M. |
title |
Historical reconstruction of subpolar north Atlantic overturning and its relationship to density |
title_short |
Historical reconstruction of subpolar north Atlantic overturning and its relationship to density |
title_full |
Historical reconstruction of subpolar north Atlantic overturning and its relationship to density |
title_fullStr |
Historical reconstruction of subpolar north Atlantic overturning and its relationship to density |
title_full_unstemmed |
Historical reconstruction of subpolar north Atlantic overturning and its relationship to density |
title_sort |
historical reconstruction of subpolar north atlantic overturning and its relationship to density |
publishDate |
2022 |
url |
http://nora.nerc.ac.uk/id/eprint/532954/ https://nora.nerc.ac.uk/id/eprint/532954/1/JGR%20Oceans%20-%202022%20-%20Roussenov%20-%20Historical%20Reconstruction%20of%20Subpolar%20North%20Atlantic%20Overturning%20and%20Its%20Relationship%20to.pdf https://doi.org/10.1029/2021JC017732 |
long_lat |
ENVELOPE(-34.041,-34.041,63.054,63.054) |
geographic |
Irminger Sea Western Basin |
geographic_facet |
Irminger Sea Western Basin |
genre |
Labrador Sea North Atlantic |
genre_facet |
Labrador Sea North Atlantic |
op_relation |
https://nora.nerc.ac.uk/id/eprint/532954/1/JGR%20Oceans%20-%202022%20-%20Roussenov%20-%20Historical%20Reconstruction%20of%20Subpolar%20North%20Atlantic%20Overturning%20and%20Its%20Relationship%20to.pdf Roussenov, Vassil M.; Williams, Richard G.; Lozier, M. Susan; Holliday, N. Penny orcid:0000-0002-9733-8002 Smith, Doug M. 2022 Historical reconstruction of subpolar north Atlantic overturning and its relationship to density. Journal of Geophysical Research: Oceans, 127 (6). https://doi.org/10.1029/2021JC017732 <https://doi.org/10.1029/2021JC017732> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2021JC017732 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
127 |
container_issue |
6 |
_version_ |
1766060917345222656 |