Interaction of Global-Scale Atmospheric Vortices: Modeling Based on   Hamiltonian System for Antipodal Vortices on Rotating Sphere
  It is shown for the first time that only an antipodal vortex pair (APV) is the elementary singular vortex object on the sphere compatible with the hydrodynamic equations. The exact weak solution of the absolute vorticity equation on the rotating sphere is obtained in the form of Hamiltonian dynamic system for interacting APVs. This is the first model describing interaction of Barrett vortices corresponding to atmospheric centers of action (ACA). In particular, new steady-state conditions for N=2 are obtained. These analytical conditions are used for the analysis of coupled cyclone-anticyclone ACAs over oceans in the Northern Hemisphere. 
Igor I. Mokhov, Sergey G. Chefranov, Alexander G. Chefranov
physics.flu-dyn physics.ao-ph