A numerical method for solving the evolution equation of solitary Rossby waves on a weak shear
Abstract
In this paper an evoluion equation in integraldifferential form for finite amplitude Rossby waves on a weak shear is presented and an efficient method for its numerical solution is set up. It is shown that a propagation of solitary wave is possible whenever a proper weak shear in basic flows acts with the nonlinear effects and dispersion of the media, both in the atmosphere and in the ocean. To test the numerical method for solving the evolution equation, a series of experiments are carried out. The results indicate that the solitary solutions do exist and interact with each other in quite a succinct, manner. Therefore the method is successful and efficient for solving initial value problems of the above equation. The time decoupling problem arising in the numerical scheme and the related filtering technique are discussed. A variety of interesting phenomena such as the interaction of solitary Rossby waves, damping, dispersion and the development of nonlinear wave train are numerically studied.
 Publication:

Advances in Atmospheric Sciences
 Pub Date:
 March 1987
 DOI:
 10.1007/BF02656660
 Bibcode:
 1987AdAtS...4...43Y
 Keywords:

 Numerical Analysis;
 Planetary Waves;
 Rotating Fluids;
 Shear Layers;
 Solitary Waves;
 Wave Equations;
 Differential Equations;
 Integral Equations;
 Nonlinear Equations;
 Wave Propagation