Open ocean regimes of relative dispersion
dc.contributor.author
hal.structure.identifier | OLLITRAULT, Michel
|
dc.contributor.author
hal.structure.identifier | COLIN DE VERDIERE, Alain
|
dc.contributor.author
hal.structure.identifier | GABILLET, Céline
|
dc.date.accessioned | 2015 |
dc.date.available | 2015 |
dc.date.issued | 2005 |
dc.date.submitted | 2015 |
dc.identifier.issn | 0022-1120 |
dc.identifier.uri | http://hdl.handle.net/10985/10165 |
dc.description.abstract | 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. |
dc.language.iso | en |
dc.publisher | Cambridge University Press (CUP) |
dc.rights | Post-print |
dc.title | Open ocean regimes of relative dispersion |
dc.identifier.doi | 10.1017/S0022112005004556 |
dc.typdoc | Article dans une revue avec comité de lecture |
dc.localisation | Centre de Paris |
dc.subject.hal | Sciences de l'ingénieur: Mécanique: Mécanique des fluides |
ensam.audience | Internationale |
ensam.page | 381-407 |
ensam.journal | Journal of Fluid Mechanics |
ensam.volume | 533 |
hal.identifier | hal-01205483 |
hal.version | 1 |
hal.status | accept |
dc.identifier.eissn | 1469-7645 |