Explosive instability of geostrophic vortices. Part 2: parametric instability |
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Authors: | Xavier Carton Thomas Meunier Glenn R. Flierl Xavier Perrot Mikhail A. Sokolovskiy |
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Affiliation: | 1. LPO, UMR 6523, UEB/UBO, Brest, France 2. LPO, UEB/UBO, Brest, France 3. EAPS, MIT, Cambridge, MA, USA 4. Institute for Water Problems of the RAS, Moscow, Russia
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Abstract: | 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. |
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