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On the stability of oceanic vortices: A solution to the problem?

机译:关于海洋涡旋的稳定性:问题的解决方案?

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摘要

This paper attempts to resolve the long-standing contradiction between the observed longevity of oceanic vortices and their theoretical instability. Using the model of quasigeostrophic, two-layer ocean, we show that a vortex in the upper layer can be stabilised by a circulation in the lower layer, such that the potential vorticity (PV) there is uniform. It is also argued that the assumption of uniform PV in the 'passive' layer corresponds to the fact that most oceanic vortices are shed by frontal currents and are alien to the well-mixed water masses around them.
机译:本文试图解决观测到的海洋涡流寿命与理论不稳定性之间的长期矛盾。使用准地转两层海洋模型,我们显示了上层的涡流可以通过下层的环流来稳定,从而使那里的潜在涡度(PV)均匀。也有人认为,在“被动”层中具有均匀PV的假设对应于这样一个事实,即大多数海洋涡流是由额流喷出的,并且与其周围的水混合均匀。

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