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	Provedor de dados ArchiMer (2) Autor Carton, Xavier (2) Flierl, Glenn R. (2) Meunier, Thomas (2) Perrot, Xavier (2) Sokolovskiy, Mikhail (2) Palavra-chave Inviscid flows (2) Parametric resonance (2) Quasi-geostrophic equations (2) Vortex stability (2) Normal or singular modes (1) Tipo do documento Text (2) Ano 2010 (2) País France (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Explosive instability of geostrophic vortices. Part 1: baroclinic instability ArchiMer Carton, Xavier; Flierl, Glenn R.; Perrot, Xavier; Meunier, Thomas; Sokolovskiy, Mikhail. In a quasi-geostrophic model, we study the baroclinic instability of a two-layer vortex. The singular unstable modes for potential vorticity anomalies are compared with the classical normal modes. Short-time singular modes are explosively unstable and, at short times, depend only on the baroclinic component of the flow. As time progresses, they evolve towards the normal modes and their sensitivity to flow parameters is explored. Asymptotic solutions are provided. Tipo: Text Palavras-chave: Quasi-geostrophic equations; Inviscid flows; Vortex stability; Normal or singular modes; Parametric resonance. Ano: 2010 URL: http://archimer.ifremer.fr/doc/00002/11352/7925.pdf Explosive instability of geostrophic vortices. Part 2: parametric instability ArchiMer Carton, Xavier; Meunier, Thomas; Flierl, Glenn R.; Perrot, Xavier; Sokolovskiy, Mikhail. In a two-layer quasi-geostrophic model, a baroclinic vortex is submitted to a periodic forcing of its mean baroclinic azimuthal velocity. It is shown that parametric effects could stabilize a vortex which is baroclinically unstable in the absence of forcing. Conversely, parametric resonance can destabilize a baroclinically stable vortex, under conditions on the vortex parameters, on the ratio of layer thicknesses or on the forcing frequency. Tipo: Text Palavras-chave: Quasi-geostrophic equations; Inviscid flows; Vortex stability; Parametric resonance. Ano: 2010 URL: http://archimer.ifremer.fr/doc/00002/11353/7926.pdf Registros recuperados: 2 Primeira ... 1 ... Última

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