And the West posted a wave that moves because of potential vorticity gradient isintrobik. Rosbi waves also called planetary waves. In particular, in shallow water, move closer to the waves due to the variation of the Coriolis parameter with latitude, known as "Beta"-effect. Dispersion relation in the approximation that the frequency of Omega =-k/(k ^ 2 + l ^ 2) ETA ETA is the Coriolis parameter miridional gradient, and the k and l are wavinombers equivalent wemiridional, respectively.