Abstract The structure of circular baroclinic vortices in rotating stratified fluids is examined in order to rationalize the observed amplification of fluid rotation inside long-lived geophysical vortices during their evolution. New relations between basic vortex parameters at horizontal mid-depth are derived in order to compare vortices with the same potential vorticity extremum at the vortex center. The fluid rotation is shown to be larger for smaller vortices, which can be interpreted as a capability of vortex amplification due to radial redistribution of the angular momentum resulting from erosion of their cores and/or changing environment with the cyclo-geostrophic adjustment. The results are consistent with observational, numerical, and laboratory examples. This mechanism of vortex intensification has important implications for understanding the longevity of coherent geophysical vortices.

中文翻译：

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斜压涡旋如何因核心侵蚀和/或环境变化而加剧

摘要 研究旋转层状流体中圆形斜压涡旋的结构，以合理解释在长寿命地球物理涡旋演化过程中观察到的流体旋转放大。推导出水平中间深度基本涡参数之间的新关系，以便比较涡中心具有相同潜在涡量极值的涡。对于较小的涡流，流体旋转被证明更大，这可以解释为涡旋放大的能力，这是由于其核心的侵蚀和/或随着循环地转调整而改变环境所导致的角动量的径向重新分布。结果与观察、数值和实验室示例一致。