中文摘要：

这研究瞄准解释在 mesoscale 旋涡(MEs ) 的旋转的热力学的特征和方向之间的关系。MEs 的几何特征在下列假设下面：MEs 的结构是对称的，并且海洋的物理变量的变化在 ME 区域在光线的方向接近线性特征。把假设基于这些，由使用没有在一个圆柱的坐标系统下面的磨擦的原始方程， MEs 的热力学的特征被导出，证明有高海表面高度( SSH )的温暖的逆旋风的旋涡和有低 SSH 的冷气旋的旋涡的常规关系不与 SSH 和旋涡的海表面温度( SST )观察一致。结果证明对称的形式是为 MEs 的几何特征的理想的近似。在上述假设的考虑，为在一个圆柱的坐标下面的 MEs 的特征的推导有优点。

英文摘要：

This study aims at explaining the relationship between thermodynamic characteristics and direction of rotation of mesoscale eddies（MEs）. The geometric characteristics of the MEs are under the following assumptions： the structure of the MEs is symmetrical, and changes of oceanic physical variables are close to linear features in the radial direction in the ME regions. Based on these assumptions, by using primitive equations without friction under a cylindrical coordinate system, the thermodynamic characteristics of the MEs are derived, showing that the conventional relationship of warm anticyclonic eddies with high sea surface height（SSH） and cold cyclonic eddies with low SSH is not consistent with the SSH and sea surface temperature（SST） observations of eddies. The results show that the symmetrical form is an ideal approximation for the geometric characteristics of MEs. In consideration of the above assumptions, there are advantages for derivation of the characteristics of the MEs under a cylindrical coordinate.