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...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.595.7403 2023-05-15T17:33:25+02:00 Open ocean regimes of relative dispersion Michel Ollitrault Ine Gabillet The Pennsylvania State University CiteSeerX Archives 2005 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.7403 http://archimer.ifremer.fr/doc/2005/publication-456.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.7403 http://archimer.ifremer.fr/doc/2005/publication-456.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://archimer.ifremer.fr/doc/2005/publication-456.pdf text 2005 ftciteseerx 2016-01-08T13:43:44Z 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. 1. Text North Atlantic Unknown Mid-Atlantic Ridge |
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Open Polar |
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Unknown |
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ftciteseerx |
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English |
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. 1. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Michel Ollitrault Ine Gabillet |
spellingShingle |
Michel Ollitrault Ine Gabillet Open ocean regimes of relative dispersion |
author_facet |
Michel Ollitrault Ine Gabillet |
author_sort |
Michel Ollitrault |
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 |
publishDate |
2005 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.7403 http://archimer.ifremer.fr/doc/2005/publication-456.pdf |
geographic |
Mid-Atlantic Ridge |
geographic_facet |
Mid-Atlantic Ridge |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
http://archimer.ifremer.fr/doc/2005/publication-456.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.595.7403 http://archimer.ifremer.fr/doc/2005/publication-456.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766131907763896320 |