Consulta: creatorFacets:"Michel, Sylvain"
Registros recuperados: 4
Data/hora: 03/06/2024 11:29:16

Variabilité de la salinité de surface d'après un modèle global de couche mélangée océanique
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Michel, Sylvain.
Sea surface salinity (SSS) influences numerous oceanic phenomena, for instance surface water ventilation, deep water formation and thermohaline circulation. SSS also controls some ocean-atmosphere coupled processes, such as the intensity of freshwater flux and the penetration of heat flux and turbulence. Salinity is more difficult to measure than temperature from in situ surveys, which results in 20 times less data being currently available. Moreover, sea surface temperature (SST) is routinely estimated from satellites, which is not possible yet for SSS. Two space missions will fill this gap soon: SMOS from the European Space Agency and Aquarius/SAC-D from NASA and CONAE.  To contribute to the SMOS project, we propose a method for estimating SSS from...
Tipo: Text
Palavras-chave: SMOS; SSS; SST; MLD; Heat balance; Vertical entrainment; Geostrophic current; Air sea fluxes; Satellite observations; Mixed layer; Salinity; SMOS; SSS; SST; MLD; Bilan de chaleur; Entraînement vertical; Courants géostrophiques; Flux air mer; Observations satellitaires; Couche mélangée; Salinité.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/these-2302.pdf

Evolution of upper layer temperature in the Bay of Biscay during the last 40 years
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Michel, Sylvain; Vandermeirsch, Frederic; Lorance, Pascal.
The temperature evolution over the past 40 years in the Bay of Biscay (North-East Atlantic) is investigated from an in situ data analysis, completed with a satellite SST (Sea Surface Temperature) analysis over the last 20 years. The in situ dataset is an interannual version of the BoByClim climatology, covering the Bay of Biscay area with a 10-km horizontal resolution and a 5-m vertical step. The satellite dataset is the European COastral Sea Operational Observing and Forcast System Program (ECOOP) daily analysis, covering the IBIROOS (Iberian-Biscay-Irish Sea) area with a 4-km resolution. The study area (43 degrees N-50 degrees N/12 degrees W-1 degrees W) extends over the intersection of the domains covered by these two analyses. In the 0-200 m layer of...
Tipo: Text
Palavras-chave: Upper layer; Climatic change; Air sea flux; Ocean circulation model; Satellite and in situ measurements; Ecosystem; Bay of Biscay.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00000/11166/7519.pdf

An eddy-permitting model of the Atlantic circulation: Evaluating open boundary conditions
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Treguier, Anne-marie; Barnier, B; De Miranda, A; Molines, J; Grima, N; Imbard, M; Madec, Gerard; Messager, Christophe; Reynaud, Thierry; Michel, Sylvain.
As part of the French CLIPPER project, an eddy permitting model of the Atlantic circulation has been run for 22 years. The domain has open boundaries at Drake passage and at 30 degreesE, from Africa to Antarctica. The simulated mean circulation, as well as the eddy activity, is satisfactory for a 1/3 degrees model resolution, and the meridional heat transport at 30 degreesS is within the range estimated from observations. We use the "mixed" open boundary algorithm of Barnier et al. [1998], which has both a radiation condition and a relaxation to climatology. The climatological boundary forcing strongly constrains the solution in the whole domain. The model heat balance adjusts through the surface (heat flux retroaction term) more than the open boundaries....
Tipo: Text
Palavras-chave: General circulation; Numerical modeling; Oceanography.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/publication-454.pdf

Temperature variability in the Bay of Biscay during the past 40 years, from an in situ analysis and a 3D global simulation
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Michel, Sylvain; Treguier, Anne-marie; Vandermeirsch, Frederic.
A global in situ analysis and a global ocean simulation are used jointly to study interannual to decadal variability of temperature in the Bay of Biscay, from 1965 to 2003. A strong cooling is obtained at all depths until the mid-1970's, followed by a sustained warming over similar to 30 years. Strong interannual fluctuations are superimposed on this slow evolution. The fluctuations are intensified at the surface and are weakest at similar to 500 m. A good agreement is found between the observed and simulated temperatures, in terms of mean values, interannual variability and time correlations. Only the decadal trend is significantly underestimated in the simulation. A comparison to satellite sea surface temperature (SST) data over the last 20 years is also...
Tipo: Text
Palavras-chave: Ocean circulation model; Air sea flux; Heat budget; Climatic change; Interannual temperature variability; Bay of Biscay.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6680.pdf