The Internal Barotropic Instability of Surface-Intensified Eddies. Part II: Modeling of the Tourbillon Site.
International audience Data from the Tourbillon Experiment Intensive Period in the northeast Atlantic presented evidence of a vertical phase shift with time of the main eddy, interpreted as an occurrence of internal barotropic instability. In order to justify this: (i) the idealized case of an isola...
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ftccsdartic:oai:HAL:hal-00268781v1 2023-05-15T17:41:31+02:00 The Internal Barotropic Instability of Surface-Intensified Eddies. Part II: Modeling of the Tourbillon Site. Hua, Bach Lien IFREMER Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) 1988-01 https://hal.archives-ouvertes.fr/hal-00268781 https://doi.org/10.1175/1520-0485(1988)018<0056:TIBIOS>2.0.CO;2 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/1520-0485(1988)018<0056:TIBIOS>2.0.CO;2 hal-00268781 https://hal.archives-ouvertes.fr/hal-00268781 doi:10.1175/1520-0485(1988)018<0056:TIBIOS>2.0.CO;2 ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.archives-ouvertes.fr/hal-00268781 Journal of Physical Oceanography, American Meteorological Society, 1988, 18 (1), pp.56-71. ⟨10.1175/1520-0485(1988)0182.0.CO;2⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 1988 ftccsdartic https://doi.org/10.1175/1520-0485(1988)018<0056:TIBIOS>2.0.CO;2 https://doi.org/10.1175/1520-0485(1988)0182.0.CO;2 2021-04-04T00:13:53Z International audience Data from the Tourbillon Experiment Intensive Period in the northeast Atlantic presented evidence of a vertical phase shift with time of the main eddy, interpreted as an occurrence of internal barotropic instability. In order to justify this: (i) the idealized case of an isolated eddy immersed in a stratified environment, whose characteristics correspond to the Tourbillon site (see Part I) and (ii) the realistic case using the full three-dimensional data from the experiment as initial conditions (Part II) are modeled. Both studies use a quasi-geostrophic periodic spectral model with six vertical normal modes and a horizontal 128×128 grid. It is demonstrated that a some what realistic “forecast” can be obtained for an integration time of up to one month. While a linear instability analysis revealed that the Tourbillon eddy is very slowly unstable (Part I), its encounter with a Mediterranean Water tongue caused a large-amplitude baroclinic perturbation, triggering a nonlinear destabilization of the eddy, and hence the observed tilting of its vertical axis with time. One failure of the model concerns the final fate of the eddy: at the end of the intensive measurement period, the eddy is observed to remain a single entity, while the quasi-geostrophic modeling predicts its fragmentation into two vertically smaller structures by the strong instability. Article in Journal/Newspaper Northeast Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Tilting ENVELOPE(-54.065,-54.065,49.700,49.700) |
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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 |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Hua, Bach Lien The Internal Barotropic Instability of Surface-Intensified Eddies. Part II: Modeling of the Tourbillon Site. |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Data from the Tourbillon Experiment Intensive Period in the northeast Atlantic presented evidence of a vertical phase shift with time of the main eddy, interpreted as an occurrence of internal barotropic instability. In order to justify this: (i) the idealized case of an isolated eddy immersed in a stratified environment, whose characteristics correspond to the Tourbillon site (see Part I) and (ii) the realistic case using the full three-dimensional data from the experiment as initial conditions (Part II) are modeled. Both studies use a quasi-geostrophic periodic spectral model with six vertical normal modes and a horizontal 128×128 grid. It is demonstrated that a some what realistic “forecast” can be obtained for an integration time of up to one month. While a linear instability analysis revealed that the Tourbillon eddy is very slowly unstable (Part I), its encounter with a Mediterranean Water tongue caused a large-amplitude baroclinic perturbation, triggering a nonlinear destabilization of the eddy, and hence the observed tilting of its vertical axis with time. One failure of the model concerns the final fate of the eddy: at the end of the intensive measurement period, the eddy is observed to remain a single entity, while the quasi-geostrophic modeling predicts its fragmentation into two vertically smaller structures by the strong instability. |
author2 |
IFREMER Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) |
format |
Article in Journal/Newspaper |
author |
Hua, Bach Lien |
author_facet |
Hua, Bach Lien |
author_sort |
Hua, Bach Lien |
title |
The Internal Barotropic Instability of Surface-Intensified Eddies. Part II: Modeling of the Tourbillon Site. |
title_short |
The Internal Barotropic Instability of Surface-Intensified Eddies. Part II: Modeling of the Tourbillon Site. |
title_full |
The Internal Barotropic Instability of Surface-Intensified Eddies. Part II: Modeling of the Tourbillon Site. |
title_fullStr |
The Internal Barotropic Instability of Surface-Intensified Eddies. Part II: Modeling of the Tourbillon Site. |
title_full_unstemmed |
The Internal Barotropic Instability of Surface-Intensified Eddies. Part II: Modeling of the Tourbillon Site. |
title_sort |
internal barotropic instability of surface-intensified eddies. part ii: modeling of the tourbillon site. |
publisher |
HAL CCSD |
publishDate |
1988 |
url |
https://hal.archives-ouvertes.fr/hal-00268781 https://doi.org/10.1175/1520-0485(1988)018<0056:TIBIOS>2.0.CO;2 |
long_lat |
ENVELOPE(-54.065,-54.065,49.700,49.700) |
geographic |
Tilting |
geographic_facet |
Tilting |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
ISSN: 0022-3670 EISSN: 1520-0485 Journal of Physical Oceanography https://hal.archives-ouvertes.fr/hal-00268781 Journal of Physical Oceanography, American Meteorological Society, 1988, 18 (1), pp.56-71. ⟨10.1175/1520-0485(1988)0182.0.CO;2⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/1520-0485(1988)018<0056:TIBIOS>2.0.CO;2 hal-00268781 https://hal.archives-ouvertes.fr/hal-00268781 doi:10.1175/1520-0485(1988)018<0056:TIBIOS>2.0.CO;2 |
op_doi |
https://doi.org/10.1175/1520-0485(1988)018<0056:TIBIOS>2.0.CO;2 https://doi.org/10.1175/1520-0485(1988)0182.0.CO;2 |
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1766143108975689728 |