The Lofoten Basin Eddy: three years of evolution as observed by Seagliders
The Lofoten Basin in the Norwegian Sea is an area where the warm Atlantic Water is subject to the greatest heat losses anywhere in the Nordic Seas. A long-lived, deep, anticyclonic eddy is located in the central part of the basin (the Lofoten Basin Eddy, LBE). Here we use observations from Seaglider...
Published in: | Journal of Geophysical Research: Oceans |
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American Geophysical Union
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Online Access: | https://hdl.handle.net/1956/18020 https://doi.org/10.1002/2017jc012982 |
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ftunivbergen:oai:bora.uib.no:1956/18020 2023-05-15T17:08:14+02:00 The Lofoten Basin Eddy: three years of evolution as observed by Seagliders Yu, Lusha Bosse, Anthony Fer, Ilker Orvik, Kjell Arild Bruvik, Erik Magnus Hessevik, Idar Kvalsund, Karsten 2018-03-06T12:30:21Z application/pdf https://hdl.handle.net/1956/18020 https://doi.org/10.1002/2017jc012982 eng eng American Geophysical Union Norges forskningsråd: 250784 urn:issn:2169-9291 urn:issn:2169-9275 https://hdl.handle.net/1956/18020 https://doi.org/10.1002/2017jc012982 cristin:1486962 Attribution CC BY-NC-ND http://creativecommons.org/licenses/by-nc-nd/4.0/ Copyright 2017 The Author(s) Journal of Geophysical Research - Oceans VDP::Matematikk og naturvitenskap: 400::Geofag: 450::Oseanografi: 452 VDP::Mathematics and natural scienses: 400::Geosciences: 450::Oceanography: 452 Peer reviewed Journal article 2018 ftunivbergen https://doi.org/10.1002/2017jc012982 2023-03-14T17:42:05Z The Lofoten Basin in the Norwegian Sea is an area where the warm Atlantic Water is subject to the greatest heat losses anywhere in the Nordic Seas. A long-lived, deep, anticyclonic eddy is located in the central part of the basin (the Lofoten Basin Eddy, LBE). Here we use observations from Seagliders, collected between July 2012 and July 2015, to describe LBE in unprecedented detail. The missions were designed to sample LBE repeatedly, allowing for multiple realizations of radial sections across the eddy. LBE has a mean radius of 1864 km and propagates cyclonically with a mean speed of approximately 3–4 cm s21. The anticyclonic azimuthal peak velocity varies between 0.5 and 0.7 m s21, located between 700 and 900 m depth. The average contribution of geostrophy in the cyclogeostrophic balance is 44%. The relative vorticity of the core is close to the local Coriolis parameter. The evolution of core water properties shows substantial interannual variability, influenced by surface buoyancy flux and advection of anomalous low-salinity nearsurface waters that may affect the vertical extent of winter convection. A comparison of the eddy properties to those inferred from automated tracking of satellite altimeter observations shows that the location of eddy center is successfully detected to within one half eddy radius, but vorticity is underestimated and the radius overestimated, each approximately by a factor of 2, because of excessive smoothing relative to the small eddy radius. publishedVersion Article in Journal/Newspaper Lofoten Nordic Seas Norwegian Sea University of Bergen: Bergen Open Research Archive (BORA-UiB) Lofoten Lofoten Basin ENVELOPE(4.000,4.000,70.000,70.000) Norwegian Sea Journal of Geophysical Research: Oceans 122 8 6814 6834 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
VDP::Matematikk og naturvitenskap: 400::Geofag: 450::Oseanografi: 452 VDP::Mathematics and natural scienses: 400::Geosciences: 450::Oceanography: 452 |
spellingShingle |
VDP::Matematikk og naturvitenskap: 400::Geofag: 450::Oseanografi: 452 VDP::Mathematics and natural scienses: 400::Geosciences: 450::Oceanography: 452 Yu, Lusha Bosse, Anthony Fer, Ilker Orvik, Kjell Arild Bruvik, Erik Magnus Hessevik, Idar Kvalsund, Karsten The Lofoten Basin Eddy: three years of evolution as observed by Seagliders |
topic_facet |
VDP::Matematikk og naturvitenskap: 400::Geofag: 450::Oseanografi: 452 VDP::Mathematics and natural scienses: 400::Geosciences: 450::Oceanography: 452 |
description |
The Lofoten Basin in the Norwegian Sea is an area where the warm Atlantic Water is subject to the greatest heat losses anywhere in the Nordic Seas. A long-lived, deep, anticyclonic eddy is located in the central part of the basin (the Lofoten Basin Eddy, LBE). Here we use observations from Seagliders, collected between July 2012 and July 2015, to describe LBE in unprecedented detail. The missions were designed to sample LBE repeatedly, allowing for multiple realizations of radial sections across the eddy. LBE has a mean radius of 1864 km and propagates cyclonically with a mean speed of approximately 3–4 cm s21. The anticyclonic azimuthal peak velocity varies between 0.5 and 0.7 m s21, located between 700 and 900 m depth. The average contribution of geostrophy in the cyclogeostrophic balance is 44%. The relative vorticity of the core is close to the local Coriolis parameter. The evolution of core water properties shows substantial interannual variability, influenced by surface buoyancy flux and advection of anomalous low-salinity nearsurface waters that may affect the vertical extent of winter convection. A comparison of the eddy properties to those inferred from automated tracking of satellite altimeter observations shows that the location of eddy center is successfully detected to within one half eddy radius, but vorticity is underestimated and the radius overestimated, each approximately by a factor of 2, because of excessive smoothing relative to the small eddy radius. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Yu, Lusha Bosse, Anthony Fer, Ilker Orvik, Kjell Arild Bruvik, Erik Magnus Hessevik, Idar Kvalsund, Karsten |
author_facet |
Yu, Lusha Bosse, Anthony Fer, Ilker Orvik, Kjell Arild Bruvik, Erik Magnus Hessevik, Idar Kvalsund, Karsten |
author_sort |
Yu, Lusha |
title |
The Lofoten Basin Eddy: three years of evolution as observed by Seagliders |
title_short |
The Lofoten Basin Eddy: three years of evolution as observed by Seagliders |
title_full |
The Lofoten Basin Eddy: three years of evolution as observed by Seagliders |
title_fullStr |
The Lofoten Basin Eddy: three years of evolution as observed by Seagliders |
title_full_unstemmed |
The Lofoten Basin Eddy: three years of evolution as observed by Seagliders |
title_sort |
lofoten basin eddy: three years of evolution as observed by seagliders |
publisher |
American Geophysical Union |
publishDate |
2018 |
url |
https://hdl.handle.net/1956/18020 https://doi.org/10.1002/2017jc012982 |
long_lat |
ENVELOPE(4.000,4.000,70.000,70.000) |
geographic |
Lofoten Lofoten Basin Norwegian Sea |
geographic_facet |
Lofoten Lofoten Basin Norwegian Sea |
genre |
Lofoten Nordic Seas Norwegian Sea |
genre_facet |
Lofoten Nordic Seas Norwegian Sea |
op_source |
Journal of Geophysical Research - Oceans |
op_relation |
Norges forskningsråd: 250784 urn:issn:2169-9291 urn:issn:2169-9275 https://hdl.handle.net/1956/18020 https://doi.org/10.1002/2017jc012982 cristin:1486962 |
op_rights |
Attribution CC BY-NC-ND http://creativecommons.org/licenses/by-nc-nd/4.0/ Copyright 2017 The Author(s) |
op_doi |
https://doi.org/10.1002/2017jc012982 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
122 |
container_issue |
8 |
container_start_page |
6814 |
op_container_end_page |
6834 |
_version_ |
1766063948537266176 |