Dynamical controls on the longevity of a non-linear vortex : The case of the Lofoten Basin Eddy
International audience 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...
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Online Access: | https://hal.archives-ouvertes.fr/hal-02563143 https://hal.archives-ouvertes.fr/hal-02563143/document https://hal.archives-ouvertes.fr/hal-02563143/file/s41598-019-49599-8.pdf https://doi.org/10.1038/s41598-019-49599-8 |
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ftccsdartic:oai:HAL:hal-02563143v1 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 Søiland, Henrik Geophysical Institute Bergen (GFI / BiU) University of Bergen (UiB) Bjerknes Centre for Climate Research (BCCR) Department of Biological Sciences Bergen (BIO / UiB) University of Bergen (UiB)-University of Bergen (UiB) Theiss Research Institute of Marine Research Bergen (IMR) 2019-12 https://hal.archives-ouvertes.fr/hal-02563143 https://hal.archives-ouvertes.fr/hal-02563143/document https://hal.archives-ouvertes.fr/hal-02563143/file/s41598-019-49599-8.pdf https://doi.org/10.1038/s41598-019-49599-8 en eng HAL CCSD Nature Publishing Group info:eu-repo/semantics/altIdentifier/doi/10.1038/s41598-019-49599-8 hal-02563143 https://hal.archives-ouvertes.fr/hal-02563143 https://hal.archives-ouvertes.fr/hal-02563143/document https://hal.archives-ouvertes.fr/hal-02563143/file/s41598-019-49599-8.pdf doi:10.1038/s41598-019-49599-8 info:eu-repo/semantics/OpenAccess ISSN: 2045-2322 EISSN: 2045-2322 Scientific Reports https://hal.archives-ouvertes.fr/hal-02563143 Scientific Reports, Nature Publishing Group, 2019, 9 (1), ⟨10.1038/s41598-019-49599-8⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2019 ftccsdartic https://doi.org/10.1038/s41598-019-49599-8 2020-12-24T06:40:16Z International audience 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. Article in Journal/Newspaper Lofoten Nordic Seas Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Lofoten Lofoten Basin ENVELOPE(4.000,4.000,70.000,70.000) Scientific Reports 9 1 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Bosse, Anthony Fer, Ilker Lilly, Jonathan Søiland, Henrik Dynamical controls on the longevity of a non-linear vortex : The case of the Lofoten Basin Eddy |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience 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. |
author2 |
Geophysical Institute Bergen (GFI / BiU) University of Bergen (UiB) Bjerknes Centre for Climate Research (BCCR) Department of Biological Sciences Bergen (BIO / UiB) University of Bergen (UiB)-University of Bergen (UiB) Theiss Research Institute of Marine Research Bergen (IMR) |
format |
Article in Journal/Newspaper |
author |
Bosse, Anthony Fer, Ilker Lilly, Jonathan Søiland, Henrik |
author_facet |
Bosse, Anthony Fer, Ilker Lilly, Jonathan 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 |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.archives-ouvertes.fr/hal-02563143 https://hal.archives-ouvertes.fr/hal-02563143/document https://hal.archives-ouvertes.fr/hal-02563143/file/s41598-019-49599-8.pdf 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 |
ISSN: 2045-2322 EISSN: 2045-2322 Scientific Reports https://hal.archives-ouvertes.fr/hal-02563143 Scientific Reports, Nature Publishing Group, 2019, 9 (1), ⟨10.1038/s41598-019-49599-8⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1038/s41598-019-49599-8 hal-02563143 https://hal.archives-ouvertes.fr/hal-02563143 https://hal.archives-ouvertes.fr/hal-02563143/document https://hal.archives-ouvertes.fr/hal-02563143/file/s41598-019-49599-8.pdf doi:10.1038/s41598-019-49599-8 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1038/s41598-019-49599-8 |
container_title |
Scientific Reports |
container_volume |
9 |
container_issue |
1 |
_version_ |
1766063929015926784 |