Point vortices dynamics on a rotating sphere and modeling of global atmospheric vortices interaction

TL;DR

This paper derives an exact solution for the dynamics of antipodal point vortices on a rotating sphere, providing a stable model for global atmospheric vortex interactions.

Contribution

It introduces a new exact solution for antipodal vortices on a rotating sphere, modeling large-scale atmospheric vortex structures.

Findings

Derived an exact solution for antipodal vortices on a rotating sphere.

Established a stable stationary solution for vortex dynamics.

Modeled global atmospheric vortex interactions effectively.

Abstract

It is shown that the hydrodynamics equations for a thin spherical liquid layer are satisfied by the stream function of a pair of antipodal vortices-APV, in contrast to the stream function of a single point vortex on a sphere with a background of a uniform opposite sign vorticity. A simple zero solution of the equation of the absolute vorticity conservation is used for bypassing well-known nonlinear problem of a point vortices interaction with regular vorticity field and an exact solution for APVs dynamics problem on a rotating sphere is obtained. Due to this a new stable stationary solution for the dynamics of APV is obtained, which can model the dynamics of the global vortex structures such as atmospheric centers of action.