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Influence des ondes de Rossby sur le système biogéochimique de l'Océan Atlantique Nord: Utilisation des données satellites couleur de l'eau et d'un modèle couplé physique/biogéochimie ArchiMer
Charria, Guillaume.
The marine phytoplankton in the ocean represents only less than 1% of global biomass. Phytoplankton performs half of all photosynthesis. This autotrophic biomass in ocean is then an essential element in the climate regulation through processes as carbon dioxide absorption during the photosynthesis. Therefore, we need to estimate precisely this biomass as well as the processes which affect it. Using remotely sensed data (altimetry and ocean colour) and a coupled physical/biogeochemical model (MERCATOR-OPA/NPZDDON), Rossby waves and their influence on phytoplankton biomass are specifically studied in the North Atlantic Ocean. Their features and their influences on surface chlorophyll concentrations were analysed. Through the different mechanisms identified,...
Tipo: Text Palavras-chave: Coupled physical/biogeochemical modelling; Multi sensor wavelet analysis; Ocean carbon cycle; North Atlantic Ocean; Primary production; Ocean colour; Altimetry; Rossby (or planetary) waves; Planetary waves; Coupled physical/biogeochemical oceanography; Modélisaiton couplée physique/biogéochimie; Analyse en ondelettes multi capteurs; Cycle océanique du carbone; Océan Atlantique Nord; Production primaire; Couleur de l'eau; Altimétrie; Ondes de Rossby ou planétaires; Océanographie couplée physique/biogéochimie.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/these-2454.pdf
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The Internal Generation of the Atlantic Ocean Interdecadal Variability ArchiMer
Arzel, Olivier; Huck, Thierry; Colin De Verdiere, Alain.
Numerical simulations of a realistic ocean general circulation model forced by prescribed surface fluxes are used to study the origin and structure of intrinsic interdecadal variability of the ocean circulation. When eddy-induced turbulent diffusivities are low enough, spontaneous oscillations of the Atlantic meridional overturning circulation (AMOC) with periods O(20) yr and amplitude O(1) Sv (1 Sv ≡ 106 m3 s−1) emerge. The transition from the steady to the oscillatory regime is shown to be consistent with a supercritical Hopf bifurcation of the horizontal Peclet number. Adding atmospheric thermal damping is shown to have a very limited influence on the domain of existence of intrinsic variability. The spatial structure of the mode consists of a dipole of...
Tipo: Text Palavras-chave: Instability; Meridional overturning circulation; Ocean circulation; Planetary waves; Climate variability; Multidecadal variability.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00464/57522/59708.pdf
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Ondas ecuatoriales atrapadas: ondas mezcladas de Rossby - gravedad OceanDocs
Cornejo Rodríguez, M.P..
A continuación se presenta información general acerca de la teoría de ondas ecuatoriales, de las características de las ondas mezcladas de Rossby-gravedad y por último, las observaciones de las mismas en el Océano Pacífico Ecuatorial.
Tipo: Journal Contribution Palavras-chave: Wave dynamics; Planetary waves; Equatorial dynamics; Equatorial trapped waves.
Ano: 1987 URL: http://hdl.handle.net/1834/2140
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