Explosive instability of geostrophic vortices. Part 2: parametric instability

被引：6

作者：

Carton, Xavier ^{[1
]}

Meunier, Thomas

Flierl, Glenn R. ^{[2
]}

Perrot, Xavier

Sokolovskiy, Mikhail A. ^{[3
]}

机构：

[1] UEB UBO, UMR 6523, LPO, Brest, France

[2] MIT, EAPS, Cambridge, MA 02139 USA

[3] RAS, Inst Water Problems, Moscow 117901, Russia

来源：

THEORETICAL AND COMPUTATIONAL FLUID DYNAMICS | 2010年 / 24卷 / 1-4期

关键词：

Quasi-geostrophic equations; Inviscid flows; Vortex stability; Parametric resonance; BAROCLINIC INSTABILITY;

D O I：

10.1007/s00162-009-0139-0

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

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.

引用

页码：131 / 135

页数：5

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