The dissipation of kinetic energy in the Lofoten Basin Eddy
International audience Ocean microstructure, current, and hydrography observations from June 2016 are used to characterize the turbulence structure of the Lofoten Basin eddy (LBE), a long-lived anticyclone in the Norwegian Sea. The LBE had an azimuthal peak velocity of 0.8 m s$^{-1}$ at 950-m depth...
Published in: | Journal of Physical Oceanography |
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Main Authors: | , , , |
Other Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2018
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Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-02401785 https://hal.archives-ouvertes.fr/hal-02401785/document https://hal.archives-ouvertes.fr/hal-02401785/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20The%20Dissipation%20of%20Kinetic%20Energy%20in%20the%20Lofoten%20Basin%20Eddy.pdf https://doi.org/10.1175/JPO-D-17-0244.1 |
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ftccsdartic:oai:HAL:hal-02401785v1 |
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Open Polar |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Internal waves Eddies North Atlantic Ocean Turbulence Mixing [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
spellingShingle |
Internal waves Eddies North Atlantic Ocean Turbulence Mixing [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] Fer, Ilker Bosse, Anthony Ferron, Bruno Bouruet-Aubertot, Pascale The dissipation of kinetic energy in the Lofoten Basin Eddy |
topic_facet |
Internal waves Eddies North Atlantic Ocean Turbulence Mixing [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
description |
International audience Ocean microstructure, current, and hydrography observations from June 2016 are used to characterize the turbulence structure of the Lofoten Basin eddy (LBE), a long-lived anticyclone in the Norwegian Sea. The LBE had an azimuthal peak velocity of 0.8 m s$^{-1}$ at 950-m depth and 22-km radial distance from its center and a corerelative vorticity reaching -0.7$f$ ($f$ is the local Coriolis parameter). When contrasted to a reference station in a relatively quiescent part of the basin, the LBE was significantly turbulent between 750 and 2000 m, exceeding the dissipation rates « in the reference station by up to two orders of magnitude. Dissipation rates were elevated particularly in the core and at the rim below the swirl velocity maximum, reaching 10$^{-8}$ W kg$^{-1}$ . The sources of energy for the observed turbulence are the background shear (gradient Richardson number less than unity) and the subinertial energy trapped by the negative vorticity of the eddy. Idealized ray-tracing calculations show that the vertical and lateral changes in stratification, shear, and vorticity allow subinertial waves to be trapped within the LBE. Spectral analysis shows increased high-wavenumber clockwise-polarized shear variance in the core and rim regions, consistent with downward-propagating near-inertial waves (vertical wavelengths of order 100 m and energy levels 3 to 10 times the canonical open-ocean level). The energetic packets with a distinct downward energy propagation are typically accompanied with an increase in dissipation levels. Based on these summer observations, the time scale to drain the volume-integrated total energy of the LBE is 14 years |
author2 |
Bjerknes Centre for Climate Research (BCCR) Department of Biological Sciences Bergen (BIO / UiB) University of Bergen (UiB)-University of Bergen (UiB) Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Processus et interactions de fine échelle océanique (PROTEO) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Institut de Recherche pour le Développement (IRD)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Institut de Recherche pour le Développement (IRD)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU) |
format |
Article in Journal/Newspaper |
author |
Fer, Ilker Bosse, Anthony Ferron, Bruno Bouruet-Aubertot, Pascale |
author_facet |
Fer, Ilker Bosse, Anthony Ferron, Bruno Bouruet-Aubertot, Pascale |
author_sort |
Fer, Ilker |
title |
The dissipation of kinetic energy in the Lofoten Basin Eddy |
title_short |
The dissipation of kinetic energy in the Lofoten Basin Eddy |
title_full |
The dissipation of kinetic energy in the Lofoten Basin Eddy |
title_fullStr |
The dissipation of kinetic energy in the Lofoten Basin Eddy |
title_full_unstemmed |
The dissipation of kinetic energy in the Lofoten Basin Eddy |
title_sort |
dissipation of kinetic energy in the lofoten basin eddy |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.archives-ouvertes.fr/hal-02401785 https://hal.archives-ouvertes.fr/hal-02401785/document https://hal.archives-ouvertes.fr/hal-02401785/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20The%20Dissipation%20of%20Kinetic%20Energy%20in%20the%20Lofoten%20Basin%20Eddy.pdf https://doi.org/10.1175/JPO-D-17-0244.1 |
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 North Atlantic Norwegian Sea |
genre_facet |
Lofoten North Atlantic Norwegian Sea |
op_source |
ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.archives-ouvertes.fr/hal-02401785 Journal of Physical Oceanography, American Meteorological Society, 2018, 48 (6), pp.1299-1316. ⟨10.1175/JPO-D-17-0244.1⟩ |
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info:eu-repo/semantics/altIdentifier/doi/10.1175/JPO-D-17-0244.1 hal-02401785 https://hal.archives-ouvertes.fr/hal-02401785 https://hal.archives-ouvertes.fr/hal-02401785/document https://hal.archives-ouvertes.fr/hal-02401785/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20The%20Dissipation%20of%20Kinetic%20Energy%20in%20the%20Lofoten%20Basin%20Eddy.pdf BIBCODE: 2018JPO.48.1299F doi:10.1175/JPO-D-17-0244.1 WOS: 000437215800005 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1175/JPO-D-17-0244.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
48 |
container_issue |
6 |
container_start_page |
1299 |
op_container_end_page |
1316 |
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1766063989309046784 |
spelling |
ftccsdartic:oai:HAL:hal-02401785v1 2023-05-15T17:08:16+02:00 The dissipation of kinetic energy in the Lofoten Basin Eddy Fer, Ilker Bosse, Anthony Ferron, Bruno Bouruet-Aubertot, Pascale Bjerknes Centre for Climate Research (BCCR) Department of Biological Sciences Bergen (BIO / UiB) University of Bergen (UiB)-University of Bergen (UiB) Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Processus et interactions de fine échelle océanique (PROTEO) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-École normale supérieure - Paris (ENS Paris) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Institut de Recherche pour le Développement (IRD)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP)-Institut de Recherche pour le Développement (IRD)-Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU) 2018-06 https://hal.archives-ouvertes.fr/hal-02401785 https://hal.archives-ouvertes.fr/hal-02401785/document https://hal.archives-ouvertes.fr/hal-02401785/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20The%20Dissipation%20of%20Kinetic%20Energy%20in%20the%20Lofoten%20Basin%20Eddy.pdf https://doi.org/10.1175/JPO-D-17-0244.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/JPO-D-17-0244.1 hal-02401785 https://hal.archives-ouvertes.fr/hal-02401785 https://hal.archives-ouvertes.fr/hal-02401785/document https://hal.archives-ouvertes.fr/hal-02401785/file/%5B15200485%20-%20Journal%20of%20Physical%20Oceanography%5D%20The%20Dissipation%20of%20Kinetic%20Energy%20in%20the%20Lofoten%20Basin%20Eddy.pdf BIBCODE: 2018JPO.48.1299F doi:10.1175/JPO-D-17-0244.1 WOS: 000437215800005 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.archives-ouvertes.fr/hal-02401785 Journal of Physical Oceanography, American Meteorological Society, 2018, 48 (6), pp.1299-1316. ⟨10.1175/JPO-D-17-0244.1⟩ Internal waves Eddies North Atlantic Ocean Turbulence Mixing [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2018 ftccsdartic https://doi.org/10.1175/JPO-D-17-0244.1 2022-01-08T23:54:24Z International audience Ocean microstructure, current, and hydrography observations from June 2016 are used to characterize the turbulence structure of the Lofoten Basin eddy (LBE), a long-lived anticyclone in the Norwegian Sea. The LBE had an azimuthal peak velocity of 0.8 m s$^{-1}$ at 950-m depth and 22-km radial distance from its center and a corerelative vorticity reaching -0.7$f$ ($f$ is the local Coriolis parameter). When contrasted to a reference station in a relatively quiescent part of the basin, the LBE was significantly turbulent between 750 and 2000 m, exceeding the dissipation rates « in the reference station by up to two orders of magnitude. Dissipation rates were elevated particularly in the core and at the rim below the swirl velocity maximum, reaching 10$^{-8}$ W kg$^{-1}$ . The sources of energy for the observed turbulence are the background shear (gradient Richardson number less than unity) and the subinertial energy trapped by the negative vorticity of the eddy. Idealized ray-tracing calculations show that the vertical and lateral changes in stratification, shear, and vorticity allow subinertial waves to be trapped within the LBE. Spectral analysis shows increased high-wavenumber clockwise-polarized shear variance in the core and rim regions, consistent with downward-propagating near-inertial waves (vertical wavelengths of order 100 m and energy levels 3 to 10 times the canonical open-ocean level). The energetic packets with a distinct downward energy propagation are typically accompanied with an increase in dissipation levels. Based on these summer observations, the time scale to drain the volume-integrated total energy of the LBE is 14 years Article in Journal/Newspaper Lofoten North Atlantic Norwegian Sea 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) Norwegian Sea Journal of Physical Oceanography 48 6 1299 1316 |