Open ocean regimes of relative dispersion
As two fluid particles separate in time, the entire spectrum of eddy motions is being sampled from the smallest to the largest scales. In large-scale geophysical systems for which the Earth rotation is important, it has been conjectured that the relative diffusivity should vary respectively as D2 an...
Published in: | Journal of Fluid Mechanics |
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Main Authors: | , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2005
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Online Access: | https://hal.archives-ouvertes.fr/hal-01205483 https://hal.archives-ouvertes.fr/hal-01205483/document https://hal.archives-ouvertes.fr/hal-01205483/file/IRENav_JFM_2005_GABILLET.pdf https://doi.org/10.1017/S0022112005004556 |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
[SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] |
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[SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] Ollitrault, Michel Gabillet, Céline Colin De Verdiere, Alain Open ocean regimes of relative dispersion |
topic_facet |
[SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] |
description |
As two fluid particles separate in time, the entire spectrum of eddy motions is being sampled from the smallest to the largest scales. In large-scale geophysical systems for which the Earth rotation is important, it has been conjectured that the relative diffusivity should vary respectively as D2 and D4/3 for distances respectively smaller and larger than a well-defined forcing scale of the order of the internal Rossby radius (with D the r.m.s. separation distance). Particle paths data from a mid-latitude float experiment in the central part of the North Atlantic appear to support these statements partly: two particles initially separated by a few km within two distinct clusters west and east of the mid-Atlantic ridge, statistically dispersed following a Richardson regime (D2∼t3 asymptotically) for r.m.s. separation distances between 40 and 300 km, in agreement with a D4/3 law. At early times, and for smaller separation distances, an exponential growth, in agreement with a D2 law, was briefly observed but only for the eastern cluster (with an e-folding time around 6 days). After a few months or separation distances greater than 300 km, the relative dispersion slowed down naturally to the Taylor absolute dispersion regime. International audience As two fluid particles separate in time, the entire spectrum of eddy motions is being sampled from the smallest to the largest scales. In large-scale geophysical systems for which the Earth rotation is important, it has been conjectured that the relative diffusivity should vary respectively as D2 and D4/3 for distances respectively smaller and larger than a well-defined forcing scale of the order of the internal Rossby radius (with D the r.m.s. separation distance). Particle paths data from a mid-latitude float experiment in the central part of the North Atlantic appear to support these statements partly: two particles initially separated by a few km within two distinct clusters west and east of the mid-Atlantic ridge, statistically dispersed following a Richardson ... |
author2 |
Laboratoire de physique des océans (LPO) 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) Institut de Recherche de l'Ecole Navale (IRENAV) Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Arts et Métiers Sciences et Technologies HESAM Université (HESAM)-HESAM Université (HESAM) |
format |
Article in Journal/Newspaper |
author |
Ollitrault, Michel Gabillet, Céline Colin De Verdiere, Alain |
author_facet |
Ollitrault, Michel Gabillet, Céline Colin De Verdiere, Alain |
author_sort |
Ollitrault, Michel |
title |
Open ocean regimes of relative dispersion |
title_short |
Open ocean regimes of relative dispersion |
title_full |
Open ocean regimes of relative dispersion |
title_fullStr |
Open ocean regimes of relative dispersion |
title_full_unstemmed |
Open ocean regimes of relative dispersion |
title_sort |
open ocean regimes of relative dispersion |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.archives-ouvertes.fr/hal-01205483 https://hal.archives-ouvertes.fr/hal-01205483/document https://hal.archives-ouvertes.fr/hal-01205483/file/IRENav_JFM_2005_GABILLET.pdf https://doi.org/10.1017/S0022112005004556 |
geographic |
Mid-Atlantic Ridge |
geographic_facet |
Mid-Atlantic Ridge |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0022-1120 EISSN: 1469-7645 Journal of Fluid Mechanics https://hal.archives-ouvertes.fr/hal-01205483 Journal of Fluid Mechanics, Cambridge University Press (CUP), 2005, 533, pp.381-407. ⟨10.1017/S0022112005004556⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1017/S0022112005004556 info:eu-repo/semantics/altIdentifier/hdl/http://hdl.handle.net/10985/10165 hal-01205483 https://hal.archives-ouvertes.fr/hal-01205483 https://hal.archives-ouvertes.fr/hal-01205483/document https://hal.archives-ouvertes.fr/hal-01205483/file/IRENav_JFM_2005_GABILLET.pdf doi:10.1017/S0022112005004556 ENSAM: http://hdl.handle.net/10985/10165 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1017/S0022112005004556 |
container_title |
Journal of Fluid Mechanics |
container_volume |
533 |
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1766130844870639616 |
spelling |
ftccsdartic:oai:HAL:hal-01205483v1 2023-05-15T17:32:38+02:00 Open ocean regimes of relative dispersion Ollitrault, Michel Gabillet, Céline Colin De Verdiere, Alain Laboratoire de physique des océans (LPO) 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) Institut de Recherche de l'Ecole Navale (IRENAV) Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Arts et Métiers Sciences et Technologies HESAM Université (HESAM)-HESAM Université (HESAM) 2005-06 https://hal.archives-ouvertes.fr/hal-01205483 https://hal.archives-ouvertes.fr/hal-01205483/document https://hal.archives-ouvertes.fr/hal-01205483/file/IRENav_JFM_2005_GABILLET.pdf https://doi.org/10.1017/S0022112005004556 en eng HAL CCSD Cambridge University Press (CUP) info:eu-repo/semantics/altIdentifier/doi/10.1017/S0022112005004556 info:eu-repo/semantics/altIdentifier/hdl/http://hdl.handle.net/10985/10165 hal-01205483 https://hal.archives-ouvertes.fr/hal-01205483 https://hal.archives-ouvertes.fr/hal-01205483/document https://hal.archives-ouvertes.fr/hal-01205483/file/IRENav_JFM_2005_GABILLET.pdf doi:10.1017/S0022112005004556 ENSAM: http://hdl.handle.net/10985/10165 info:eu-repo/semantics/OpenAccess ISSN: 0022-1120 EISSN: 1469-7645 Journal of Fluid Mechanics https://hal.archives-ouvertes.fr/hal-01205483 Journal of Fluid Mechanics, Cambridge University Press (CUP), 2005, 533, pp.381-407. ⟨10.1017/S0022112005004556⟩ [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph] info:eu-repo/semantics/article Journal articles 2005 ftccsdartic https://doi.org/10.1017/S0022112005004556 2021-10-24T11:31:01Z As two fluid particles separate in time, the entire spectrum of eddy motions is being sampled from the smallest to the largest scales. In large-scale geophysical systems for which the Earth rotation is important, it has been conjectured that the relative diffusivity should vary respectively as D2 and D4/3 for distances respectively smaller and larger than a well-defined forcing scale of the order of the internal Rossby radius (with D the r.m.s. separation distance). Particle paths data from a mid-latitude float experiment in the central part of the North Atlantic appear to support these statements partly: two particles initially separated by a few km within two distinct clusters west and east of the mid-Atlantic ridge, statistically dispersed following a Richardson regime (D2∼t3 asymptotically) for r.m.s. separation distances between 40 and 300 km, in agreement with a D4/3 law. At early times, and for smaller separation distances, an exponential growth, in agreement with a D2 law, was briefly observed but only for the eastern cluster (with an e-folding time around 6 days). After a few months or separation distances greater than 300 km, the relative dispersion slowed down naturally to the Taylor absolute dispersion regime. International audience As two fluid particles separate in time, the entire spectrum of eddy motions is being sampled from the smallest to the largest scales. In large-scale geophysical systems for which the Earth rotation is important, it has been conjectured that the relative diffusivity should vary respectively as D2 and D4/3 for distances respectively smaller and larger than a well-defined forcing scale of the order of the internal Rossby radius (with D the r.m.s. separation distance). Particle paths data from a mid-latitude float experiment in the central part of the North Atlantic appear to support these statements partly: two particles initially separated by a few km within two distinct clusters west and east of the mid-Atlantic ridge, statistically dispersed following a Richardson ... Article in Journal/Newspaper North Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Mid-Atlantic Ridge Journal of Fluid Mechanics 533 |