Surface‐Forced Variability in the Nordic Seas Overturning Circulation and Overflows
Abstract Water mass transformation in the Nordic Seas and the associated overflow of dense waters across the Greenland‐Scotland Ridge (GSR) acts to maintain the lower limb of the Atlantic meridional overturning circulation. Here, we use ocean and atmospheric reanalysis to assess the temporal variabi...
Published in: | Geophysical Research Letters |
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Online Access: | https://doi.org/10.1029/2023GL104158 https://doaj.org/article/85806a01e7c949c7ad0b0939709e6274 |
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ftdoajarticles:oai:doaj.org/article:85806a01e7c949c7ad0b0939709e6274 2024-09-15T18:09:14+00:00 Surface‐Forced Variability in the Nordic Seas Overturning Circulation and Overflows Marius Årthun 2023-08-01T00:00:00Z https://doi.org/10.1029/2023GL104158 https://doaj.org/article/85806a01e7c949c7ad0b0939709e6274 EN eng Wiley https://doi.org/10.1029/2023GL104158 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2023GL104158 https://doaj.org/article/85806a01e7c949c7ad0b0939709e6274 Geophysical Research Letters, Vol 50, Iss 15, Pp n/a-n/a (2023) Nordic Seas overturning circulation overflow waters surface forcing multidecadal variability Geophysics. Cosmic physics QC801-809 article 2023 ftdoajarticles https://doi.org/10.1029/2023GL104158 2024-08-05T17:49:23Z Abstract Water mass transformation in the Nordic Seas and the associated overflow of dense waters across the Greenland‐Scotland Ridge (GSR) acts to maintain the lower limb of the Atlantic meridional overturning circulation. Here, we use ocean and atmospheric reanalysis to assess the temporal variability in the Nordic Seas overturning circulation between 1950 and 2020 and its relation to surface buoyancy forcing. We find that variable surface‐forced transformation of Atlantic waters in the eastern Nordic Seas can explain variations in overflow transport across the GSR. The production of dense water masses in the Greenland and Iceland Seas is of minor importance to overflow variability. The Nordic Seas overturning circulation shows pronounced multidecadal variability that is in phase with the Atlantic Multidecadal Variability (AMV) index, but no long‐term trend. As the AMV is currently transitioning into its negative phase, the next decades could see a decreased overflow from the Nordic Seas. Article in Journal/Newspaper Greenland Greenland-Scotland Ridge Iceland Nordic Seas Directory of Open Access Journals: DOAJ Articles Geophysical Research Letters 50 15 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Nordic Seas overturning circulation overflow waters surface forcing multidecadal variability Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Nordic Seas overturning circulation overflow waters surface forcing multidecadal variability Geophysics. Cosmic physics QC801-809 Marius Årthun Surface‐Forced Variability in the Nordic Seas Overturning Circulation and Overflows |
topic_facet |
Nordic Seas overturning circulation overflow waters surface forcing multidecadal variability Geophysics. Cosmic physics QC801-809 |
description |
Abstract Water mass transformation in the Nordic Seas and the associated overflow of dense waters across the Greenland‐Scotland Ridge (GSR) acts to maintain the lower limb of the Atlantic meridional overturning circulation. Here, we use ocean and atmospheric reanalysis to assess the temporal variability in the Nordic Seas overturning circulation between 1950 and 2020 and its relation to surface buoyancy forcing. We find that variable surface‐forced transformation of Atlantic waters in the eastern Nordic Seas can explain variations in overflow transport across the GSR. The production of dense water masses in the Greenland and Iceland Seas is of minor importance to overflow variability. The Nordic Seas overturning circulation shows pronounced multidecadal variability that is in phase with the Atlantic Multidecadal Variability (AMV) index, but no long‐term trend. As the AMV is currently transitioning into its negative phase, the next decades could see a decreased overflow from the Nordic Seas. |
format |
Article in Journal/Newspaper |
author |
Marius Årthun |
author_facet |
Marius Årthun |
author_sort |
Marius Årthun |
title |
Surface‐Forced Variability in the Nordic Seas Overturning Circulation and Overflows |
title_short |
Surface‐Forced Variability in the Nordic Seas Overturning Circulation and Overflows |
title_full |
Surface‐Forced Variability in the Nordic Seas Overturning Circulation and Overflows |
title_fullStr |
Surface‐Forced Variability in the Nordic Seas Overturning Circulation and Overflows |
title_full_unstemmed |
Surface‐Forced Variability in the Nordic Seas Overturning Circulation and Overflows |
title_sort |
surface‐forced variability in the nordic seas overturning circulation and overflows |
publisher |
Wiley |
publishDate |
2023 |
url |
https://doi.org/10.1029/2023GL104158 https://doaj.org/article/85806a01e7c949c7ad0b0939709e6274 |
genre |
Greenland Greenland-Scotland Ridge Iceland Nordic Seas |
genre_facet |
Greenland Greenland-Scotland Ridge Iceland Nordic Seas |
op_source |
Geophysical Research Letters, Vol 50, Iss 15, Pp n/a-n/a (2023) |
op_relation |
https://doi.org/10.1029/2023GL104158 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2023GL104158 https://doaj.org/article/85806a01e7c949c7ad0b0939709e6274 |
op_doi |
https://doi.org/10.1029/2023GL104158 |
container_title |
Geophysical Research Letters |
container_volume |
50 |
container_issue |
15 |
_version_ |
1810446660394811392 |