Dynamical controls on the longevity of a non-linear vortex : The case of the Lofoten Basin Eddy
The Lofoten Basin is the largest oceanic reservoir of heat in the Nordic Seas, and the site of important heat fluxes to the atmosphere. An intense permanent anticyclone in the basin impacts the regional hydrography, energetics, and ecosystem. Repeated sampling of this Lofoten Basin Eddy from dedicat...
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Online Access: | https://hdl.handle.net/1956/21085 https://doi.org/10.1038/s41598-019-49599-8 |
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ftunivbergen:oai:bora.uib.no:1956/21085 2023-05-15T17:08:14+02:00 Dynamical controls on the longevity of a non-linear vortex : The case of the Lofoten Basin Eddy Bosse, Anthony Fer, Ilker Lilly, Jonathan M. Søiland, Henrik 2019-09-27T12:49:04Z application/pdf https://hdl.handle.net/1956/21085 https://doi.org/10.1038/s41598-019-49599-8 eng eng Nature urn:issn:2045-2322 https://hdl.handle.net/1956/21085 https://doi.org/10.1038/s41598-019-49599-8 cristin:1730365 Attribution CC BY http://creativecommons.org/licenses/by/4.0 Copyright 2019 The Author(s) Scientific Reports Peer reviewed Journal article 2019 ftunivbergen https://doi.org/10.1038/s41598-019-49599-8 2023-03-14T17:41:53Z The Lofoten Basin is the largest oceanic reservoir of heat in the Nordic Seas, and the site of important heat fluxes to the atmosphere. An intense permanent anticyclone in the basin impacts the regional hydrography, energetics, and ecosystem. Repeated sampling of this Lofoten Basin Eddy from dedicated cruises, autonomous profiling gliders, and acoustically-tracked subsurface floats enables the documentation of its dynamics and energetics over the course of 15 months. The eddy core, in nearly solid-body rotation, exhibits an unusually low vertical vorticity close to the local inertial frequency and important strain rates at the periphery. Subsurface floats as deep as 800 m are trapped within the core for their entire deployment duration (up to 15 months). The potential vorticity is reduced in the core by two orders of magnitude relative to the surroundings, creating a barrier. In the winter, this barrier weakens and lateral exchanges and heat flux between the eddy and the surroundings increase, apparently the result of dynamical instabilities and a possible eddy merger. Based on a simple energy budget, the dissipation timescale for the eddy energy is three years, during which wintertime convection seasonally modulates potential and kinetic energy. publishedVersion Article in Journal/Newspaper Lofoten Nordic Seas University of Bergen: Bergen Open Research Archive (BORA-UiB) Lofoten Lofoten Basin ENVELOPE(4.000,4.000,70.000,70.000) Scientific Reports 9 1 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
The Lofoten Basin is the largest oceanic reservoir of heat in the Nordic Seas, and the site of important heat fluxes to the atmosphere. An intense permanent anticyclone in the basin impacts the regional hydrography, energetics, and ecosystem. Repeated sampling of this Lofoten Basin Eddy from dedicated cruises, autonomous profiling gliders, and acoustically-tracked subsurface floats enables the documentation of its dynamics and energetics over the course of 15 months. The eddy core, in nearly solid-body rotation, exhibits an unusually low vertical vorticity close to the local inertial frequency and important strain rates at the periphery. Subsurface floats as deep as 800 m are trapped within the core for their entire deployment duration (up to 15 months). The potential vorticity is reduced in the core by two orders of magnitude relative to the surroundings, creating a barrier. In the winter, this barrier weakens and lateral exchanges and heat flux between the eddy and the surroundings increase, apparently the result of dynamical instabilities and a possible eddy merger. Based on a simple energy budget, the dissipation timescale for the eddy energy is three years, during which wintertime convection seasonally modulates potential and kinetic energy. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Bosse, Anthony Fer, Ilker Lilly, Jonathan M. Søiland, Henrik |
spellingShingle |
Bosse, Anthony Fer, Ilker Lilly, Jonathan M. Søiland, Henrik Dynamical controls on the longevity of a non-linear vortex : The case of the Lofoten Basin Eddy |
author_facet |
Bosse, Anthony Fer, Ilker Lilly, Jonathan M. Søiland, Henrik |
author_sort |
Bosse, Anthony |
title |
Dynamical controls on the longevity of a non-linear vortex : The case of the Lofoten Basin Eddy |
title_short |
Dynamical controls on the longevity of a non-linear vortex : The case of the Lofoten Basin Eddy |
title_full |
Dynamical controls on the longevity of a non-linear vortex : The case of the Lofoten Basin Eddy |
title_fullStr |
Dynamical controls on the longevity of a non-linear vortex : The case of the Lofoten Basin Eddy |
title_full_unstemmed |
Dynamical controls on the longevity of a non-linear vortex : The case of the Lofoten Basin Eddy |
title_sort |
dynamical controls on the longevity of a non-linear vortex : the case of the lofoten basin eddy |
publisher |
Nature |
publishDate |
2019 |
url |
https://hdl.handle.net/1956/21085 https://doi.org/10.1038/s41598-019-49599-8 |
long_lat |
ENVELOPE(4.000,4.000,70.000,70.000) |
geographic |
Lofoten Lofoten Basin |
geographic_facet |
Lofoten Lofoten Basin |
genre |
Lofoten Nordic Seas |
genre_facet |
Lofoten Nordic Seas |
op_source |
Scientific Reports |
op_relation |
urn:issn:2045-2322 https://hdl.handle.net/1956/21085 https://doi.org/10.1038/s41598-019-49599-8 cristin:1730365 |
op_rights |
Attribution CC BY http://creativecommons.org/licenses/by/4.0 Copyright 2019 The Author(s) |
op_doi |
https://doi.org/10.1038/s41598-019-49599-8 |
container_title |
Scientific Reports |
container_volume |
9 |
container_issue |
1 |
_version_ |
1766063924646510592 |