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Evolution of an oceanic anticyclone in the lee of Madeira Island: In situ and remote sensing survey ArchiMer
Caldeira, Rui M. A.; Stegner, Alexandre; Couvelard, Xavier; Araujo, Isabel B.; Testor, Pierre; Lorenzo, Alvaro.
Island wakes are areas of a strong eddy activity influencing the availability and transport of organic matter in the ocean which, in turn impact biological productivity. Despite this, eddy formation in the lee of North Atlantic tropical islands is scarcely documented, except for the Canary Islands. Moreover, the occurrence of anticyclones leeward of Madeira has seldom been detected. During the summer of 2011, a multiplatform approach, combining satellite data with in situ measurements, was used to study an anticyclonic eddy generated in the lee of the Madeira Island. The main objective was to confirm recent numerical evidence suggesting that orographically perturbed winds can induce anticyclonic eddies leeward of Madeira, particularly during summer months....
Tipo: Text Palavras-chave: Boundary-layer; Inertial instability; Mode water; Mixed layer; Intrathermocline eddies; Wake.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00197/30846/29209.pdf
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Rôle du rail équatorial dans la circulation méridienne océanique : interactions des échelles spatiales conduisant au mélange ArchiMer
Menesguen, Claire.
The large scale meridional overturning circulation in the ocean is maintained by a combination of several mechanisms. This dissertation focuses on turbulent equatorial mixing, one of the key mechanisms to balance heat forcing. The motivation for the research is observations of thin layers of well-mixed density and tracers distributed intermittently over the vertical that coincide with particular features of a larger scale pattern of equatorial jets. A large number of numerical experiments at moderately high resolution was performed in order to successfully replicate the observed equatorial dynamics, which involves both quasi-barotropic extra-equatorial jets and small vertical scale equatorial deep jets. The combination of the two systems of jets...
Tipo: Text Palavras-chave: Dynamics; Ocean; Shear instability; Inertial instability; Scales interaction; Mixing; Equator; Dynamique; Océan; Instabilité de cisaillement; Instabilité inertielle; Interaction d'échelles; Mélange; Équateur.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/these-6463.pdf
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