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	Provedor de dados ArchiMer (6) Autor Bourles, Bernard (1) Boutin, Jacqueline (1) Chaduteau, Carine (1) De Boisseson, Eric (1) Deleersnijder, E (1) Edokpayi, C A (1) Hounkonnou, M N (1) Kolodziejczyk, Nicolas (1) Lazure, Pascal (1) Le Gentil, Sylvie (1) Menesguen, Claire (1) Meunier, Thomas (1) Nubi, O A (1) Proctor, R (1) Reverdin, Gilles (1) Ruddick, Kg (1) Schopp, Richard (1) Sommer, Anna (1) Tartinville, B (1) Uittenbogaard, Re (1) Mais... Palavra-chave Advection (6) Analyse lagrangienne (1) Argo (1) Atlantique Nord (1) Atm/Ocean Structure/ Phenomena (1) Atmospheric fluxes (1) Baroclinic instability (1) Budget (1) Circulation/ Dynamics (1) Courant Nord Atlantique (1) Dynamics (1) Eau modale (1) Equatorial undercurrent (1) Equatorial upwelling (1) Fluid (1) Fluide (1) Flux atmosphériques (1) Geostrophic balance (1) Gulf of Guinea (1) Gyre subpolaire (1) Mais... Tipo do documento Text (6) Ano 2016 (1) 2015 (2) 2010 (1) 2008 (1) 1998 (1) País France (6) Idioma Inglês (4) Francês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 6 Primeira ... 1 ... Última Tracer stirring around a meddy: The formation of layering ArchiMer Meunier, Thomas; Menesguen, Claire; Schopp, Richard; Le Gentil, Sylvie. The dynamics of the formation of layering surrounding meddy-like vortex lenses is investigated using primitive equation (PE), quasigeostrophic (QG), and tracer advection models. Recent in situ data inside a meddy confirmed the formation of highly density-compensated layers in temperature and salinity at the periphery of the vortex core. Very high-resolution PE modeling of an idealized meddy showed the formation of realistic layers even in the absence of double-diffusive processes. The strong density compensation observed in the PE model, in good agreement with in situ data, suggests that stirring might be a leading process in the generation of layering. Passive tracer experiments confirmed that the vertical variance cascade in the periphery of the vortex... Tipo: Text Palavras-chave: Circulation/ Dynamics; Advection; Dynamics; Atm/Ocean Structure/ Phenomena; Vortices; Models and modeling; Primitive equations model; Quasigeostrophic models; Tracers. Ano: 2015 URL: http://archimer.ifremer.fr/doc/00255/36599/35160.pdf Sea Surface Salinity and Temperature Budgets in the North Atlantic Subtropical Gyre during SPURS Experiment: August 2012-August 2013 ArchiMer Sommer, Anna; Reverdin, Gilles; Kolodziejczyk, Nicolas; Boutin, Jacqueline. Variability at large to meso-scale in sea surface salinity (SSS) and sea surface temperature (SST) is investigated in the subtropical North Atlantic Ocean during the Subtropical Atlantic Surface Salinity Experiment Strasse/SPURS in August 2012—August 2013. The products of the Soil Moisture and Ocean Salinity (SMOS) mission corrected from large scale systematic errors are tested and used to retrieve meso-scale salinity features, while OSTIA products, resolving meso-scale temperature features are used for SST. The comparison of corrected SMOS SSS data with drifter's in situ measurements from SPURS experiment shows a reasonable agreement, especially during winter time with RMS differences on the order of 0.15 pss (for 10 days, 75 km resolution SMOS product).... Tipo: Text Palavras-chave: Salinity; Temperature; Budget; Meso-scale; Advection; SMOS; SPURS. Ano: 2015 URL: https://archimer.ifremer.fr/doc/00468/57933/60319.pdf A coastal ocean model intercomparison study for a three-dimensional idealised test case ArchiMer Tartinville, B; Deleersnijder, E; Lazure, Pascal; Proctor, R; Ruddick, Kg; Uittenbogaard, Re. Several coastal ocean models have been used to compute the circulation on the Northwest European Continental Shelf. Five of them, developed within the European Union, are compared in the scope of an idealised three-dimensional test case, dealing with the geostrophic adjustment of a freshwater cylinder. As the central eddy adjusts, unstable baroclinic vortices start to grow. All the models are able to produce such unstable vortices. However, two of them produce an order-two instability, which is in accordance with a previous laboratory experiment, while the others exhibit an order-four instability. Using a simple scaling analysis, it is seen that the azimuthal wavenumber depends on the ratio of the kinetic energy to the available potential energy. It... Tipo: Text Palavras-chave: Model intercomparison; Advection; Baroclinic instability; Geostrophic balance. Ano: 1998 URL: http://archimer.ifremer.fr/doc/00448/55938/57485.pdf Les Eaux Modales du gyre subpolaire de l'Atlantique Nord : origine, formation, variabilité ArchiMer De Boisseson, Eric. The subpolar Mode Waters of the North Atlantic ocean play a key role in the general oceanic surface circulation. Their life cycle has only been described from an average of observations over several decades. This description avoids the real time scale of this life cycle and smooths its variaribility. It also does not adress the setting the Mode Water properties. This thesis work deals with these aspects by analysing both the ORCA025-G70 model fields and the observations.The lagrangian analysis of the ORCA025-G70 fields highlights the key role of the North Atlantic current in the life cycle of the Mode Waters. The Mode Waters are fed and carried by this current. They form during the winter mixed layer deepening due to the surface atmospheric fluxes. The... Tipo: Text Palavras-chave: ORCA025 G70; Lagrangian analysis; Argo; Advection; Atmospheric fluxes; North Atlantic current; Subpolar gyre; North Atlantic; Mode water; ORCA025 G70; Analyse lagrangienne; Argo; Advection; Flux atmosphériques; Courant Nord Atlantique; Gyre subpolaire; Atlantique Nord; Eau modale. Ano: 2010 URL: http://archimer.ifremer.fr/doc/2010/these-7469.pdf On the Nutrient distribution and phytoplankton biomass in the Gulf of Guinea equatorial band as inferred from In-situ measurements ArchiMer Nubi, O A; Bourles, Bernard; Edokpayi, C A; Hounkonnou, M N. Oceanographic in situ data collected in the Gulf of Guinea during six cruises carried out between 2005 and 2007 were analysed to study the influence of equatorial upwelling on the productivity of the region. At 10°W, observations during boreal summer and autumn cruises captured seasonal upwelling influences. In response to the shoaling pycnocline in June 2005, higher concentrations of nitrate and chlorophyll fluorescence were recorded at the ocean surface in June than in September. Our findings challenge the paradigm that westward advection from the nutrient-rich African coast is responsible for equatorial enrichment in the Gulf of Guinea. Vertical sections of the parameters under study in the summer of 2005 showed no westward advection from 3°E to 10°W... Tipo: Text Palavras-chave: Advection; Equatorial undercurrent; Equatorial upwelling; Gulf of Guinea; Nutrients; Phytoplankton biomass.. Ano: 2016 URL: https://archimer.ifremer.fr/doc/00621/73324/72489.pdf Origine et circulation des fluides dans les sédiments des marges. Contribution de l'hélium et du méthane dans la compréhension des processus. Étude de 2 zones actives ArchiMer Chaduteau, Carine. Fluid migration is a very important process in marine sediments on margins. Studying fluids is fundamental to constrain the energy potential of margins. Methane is the predominant gas in marine sediments, deriving primarily from the degradation of organic matter. However methane could be also generated through the serpentinization of mantle rocks underlying the sedimentary cover in some specific geodynamical settings. One way to test this hypothesis is to use helium isotopes, which are known to be powerful tracers of the fluid-mantle interaction. To this purpose, a new method has been developed for the sampling and the quantitative extraction of dissolved helium from sediment pore-waters. During the Zairov2 and Vicking cruises, samples were collected in... Tipo: Text Palavras-chave: Mantle; Serpentinization; Advection; Mud volcano; Pockmark; Methane; Helium; Fluid; Margin; Manteau; Serpentinisation; Advection; Volcan de boue; Pockmark; Méthane; Hélium; Fluide; Marge. Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/these-3724.pdf Registros recuperados: 6 Primeira ... 1 ... Última

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