Formation and stability of tripolar vortices in stratified geostrophic flows

Corrard, S.M. and Carton, X.J. (1999) Formation and stability of tripolar vortices in stratified geostrophic flows. Il nuovo cimento C, 22 C (6). pp. 767-778. ISSN 1826-9885

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The formation, stationarity and stability of tripolar vortices is investigated in a two-layer quasi-geostrophic model. On the f-plane, these tripoles form from the barotropic and baroclinic instabilities of circular isolated vortices. Various horizontal and vertical potential vorticity distributions, both piecewiseconstant and continuous, are considered here for these circular vortices. First, their linear stability is computed for normal-mode perturbations. Then, their nonlinear evolution with an elliptical initial perturbation is studied by means of a pseudo-spectral and of a contour surgery code. Two types of baroclinic tripoles are found to result from these instabilities: surface-intensified structures for dominant barotropic instability, arch-shaped tripoles for more baroclinic vortices. The stationarity of these tripoles and their stability to initial disturbances or to the action of beta-effect is finally investigated.

Item Type: Article
Additional Information: Paper presented at the International Workshop on “Vortex Dynamics in Geophysical Flows”, Castro Marina (LE), Italy, 22-26 June 1998.
Uncontrolled Keywords: Coriolis effects; Hydrodynamics stability; Vortex dynamics; Stratified flows; Conference proceedings
Subjects: 500 Scienze naturali e Matematica > 550 Scienze della Terra > 551 Geologia, Idrologia, Meteorologia
Depositing User: Marina Spanti
Date Deposited: 11 Oct 2019 14:54
Last Modified: 11 Oct 2019 14:54

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