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首页> 外文会议>Fifth International Symposium on Stratified Flows >Tripolar vortices in a two-layer shallow-water model
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Tripolar vortices in a two-layer shallow-water model

机译：两层浅水模型中的三极涡旋

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The linear stability analysis of circular vortices perturbed on normal angular modes in a two-layer shallow-water model shows that the elliptical mode is often the most unstable. Little difference is observed between vortex polarities or between shallow-water and quasi-geostrophic models except in the two-dimensional or frontal limits. When an elliptical perturbation is added to these circular vortices, their non-linear evolution can form three kinds of tripoles: barotropic, surface-intensified or baroclinic. These tripoles are stationary in a uniformly rotating frame of reference and are long-lived on the f-plane. The β-effect induces a strong anisotropy of the satellites during their rotation around the core, leading to their disappearance.
机译：在两层浅水模型中，在正常角模上扰动的圆形涡旋的线性稳定性分析表明，椭圆模通常是最不稳定的。除二维或额度界限外，在涡旋极性之间或在浅水和准地转模型之间几乎没有观察到差异。当将椭圆形扰动加到这些圆形涡旋上时，它们的非线性演化可以形成三种三极管：正压型，表面增强型或斜压型。这些三脚架在均匀旋转的参照系中固定不动，并且在f平面上使用寿命长。 β效应会在卫星绕核心旋转时引起强烈的各向异性，从而导致卫星消失。

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