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Eddy properties in the Western Mediterranean Sea from satellite altimetry and a numerical simulation

AuthorsEscudier, Romain ; Renault, Lionel; Pascual, Ananda ; Brasseur, Pierre; Chelton, Dudley; Beuvier, Jonathan
Issue DateJun-2016
PublisherJohn Wiley & Sons
CitationJournal of Geophysical Research 121: 3990-4006 (2016)
AbstractThree different eddy detection and tracking methods are applied to the outputs of a high-resolution simulation in the Western Mediterranean Sea in order to extract mesoscale eddy characteristics. The results are compared with the same eddy statistics derived from satellite altimetry maps over the same period. Eddy radii are around 30 km in altimetry maps whereas, in the model, they are around 20 km. This is probably due to the inability of altimetry maps to resolve the smaller mesoscale in the region. About 30 eddies are detected per day in the basin with a very heterogeneous spatial distribution and relatively short lifespans (median life around 13 days). Unlike other areas of the open ocean, they do not have a preferred direction of propagation but appear to be advected by mean currents. The number of detected eddies seems to present an annual cycle when separated according to their lifespan. With the numerical simulation, we show that anticyclones extend deeper in the water column and have a more conic shape than cyclones.
Publisher version (URL)https://doi.org/10.1002/2015JC011371
Identifiersdoi: 10.1002/2015JC011371
issn: 0148-0227
Appears in Collections:(IMEDEA) Artículos
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