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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...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6748989/ https://www.ncbi.nlm.nih.gov/pubmed/31530826 http://dx.doi.org/10.1038/s41598-019-49599-8 |
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author | Bosse, Anthony Fer, Ilker Lilly, Jonathan M. Søiland, Henrik |
author_facet | Bosse, Anthony Fer, Ilker Lilly, Jonathan M. Søiland, Henrik |
author_sort | Bosse, Anthony |
collection | PubMed |
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. |
format | Online Article Text |
id | pubmed-6748989 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-67489892019-09-27 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 Sci Rep Article 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. Nature Publishing Group UK 2019-09-17 /pmc/articles/PMC6748989/ /pubmed/31530826 http://dx.doi.org/10.1038/s41598-019-49599-8 Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article 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 |
title | 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_short | 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 |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6748989/ https://www.ncbi.nlm.nih.gov/pubmed/31530826 http://dx.doi.org/10.1038/s41598-019-49599-8 |
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