Explosive instability of geostrophic vortices. Part 1: baroclinic instability

被引：0
|
作者：
Xavier Carton
Glenn R. Flierl
Xavier Perrot
Thomas Meunier
Mikhail A. Sokolovskiy
机构：
[1] LPO,
[2] UMR 6523,undefined
[3] UEB/UBO,undefined
[4] LPO,undefined
[5] UEB/UBO,undefined
[6] EAPS,undefined
[7] MIT,undefined
[8] Institute for Water Problems of the RAS,undefined
来源：
Theoretical and Computational Fluid Dynamics | 2010年 / 24卷
关键词：
Quasi-geostrophic equations; Inviscid flows; Vortex stability; Normal or singular modes; Parametric resonance; 92.05.Bc; 92.10.ak; 92.10.ei; 47.15; 47.20.Cq;
D O I：
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学科分类号：
摘要：
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.
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页码：125 / 130
页数：5
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