Finite-core hetons: stability and interactions
Finite-core hetons: stability and interactions
复制标题
有限核氦子：稳定性和相互作用
DOI：
10.1017/s0022112000001816
复制
发表时间：
2000
影响因子：
3.7
通讯作者：
J. Verron
中科院分区：
文献类型：
--
作者：
M. Sokolovskiy;J. Verron
在f平面上的准地转近似的背景下，研究了具有有限核的垂直补偿两层涡旋的动力学。采用两层版本的轮廓动力学方法，并辅以所谓的轮廓手术技术。当涡旋斑块的初始位置是对称的时，特别注意了两heton相互作用。根据外部参数，即几何参数和分层，对观察到的不同状态进行分类。在这个参数空间中，可以观察到由两个heton之间的碰撞产生的新的准稳态：(1)形成由朝相反方向运动的两层涡旋组成的构型，作为一种特殊情况，形成类似于“克拉普斯”台球的构型；(2)一个heton被另一个heton吸收，随后一个新的偶极子运动；(3)形成比原始heton更大的两层偶极子，与尾迹中旋转的外围卫星漩涡有关。其中一些结果可能对海洋中尺度涡旋的分析有启示意义。
The dynamics of vertically compensated two-layer vortices (hetons) with finite cores are examined within the context of the quasi-geostrophic approximation on the f-plane. The two-layer version of the contour dynamics method is used, and complemented by the so-called contour surgery technique. Special attention is paid to two-heton interactions when the initial locations of the vortex patches are symmetrical. A classification of the different regimes observed is made according to external parameters, namely geometrical parameters and stratification. In this parameter space, novel quasi-stationary states resulting from collisions between two hetons may be observed: (i) formation of a configuration consisting of two-layer vortices moving in opposite directions and, as a special case, a configuration analogous to the ‘klapstoss’ billiard shot, (ii) absorption of one heton by the other and subsequent movement of a new dipole, (iii) formation of two-layer dipoles, larger than the original hetons, associated with rotating peripheral satellite eddies in their wakes. Some of these results may have implications for the analysis of mesoscale vortices in the ocean.