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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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Friction and mixing in the Faroe Bank Channel outflow ArchiMer
Duncan, Lm; Bryden, Hl; Cunningham, Sa.
Three hydrographic sections made during RRS Discovery cruise 242, from 7 September to 6 October 1999, are used to study the Faroe Bank Channel overflow. Each section, made perpendicular to the plume direction, comprised 10-14 stations measuring the outflow properties and velocity. The overflow defined as water with potential temperatures below 3 degreesC has densities greater than 28.1 kg m(-3), salinities between 34.9 and 35.1, with velocities as high as 80 cm s(-1) approximately 20 km downstream from the sill. We use these measurements to describe the characteristics of the outflow and to estimate the amount of friction and mixing as the plume travels along the continental slope into the Iceland Basin. From Lowered Acoustic Doppler Current Profiler...
Tipo: Text Palavras-chave: Chenal du banc des Faroe; Flux supérieur; Friction; Mélange; Faroe Bank Channel; Overflow; Friction; Mixing.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00321/43240/42969.pdf
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