THE FINITE-AMPLITUDE SYMMETRIC INSTABILITY OF MESOSCALE DISTURB-ANCE IN BAROCLINIC ATMOSPHERE

By utilizing a non-geostrophic and non-hydrostatic EADY's model, the non-linear symmetric instability in the viscous baroclinic current is discussed. It is considered that the basic field has constant vertical and horizontal shear and the disturbance field does not change in the direction of the basic current. By using the perturbation method, the disturbance amplitude equation in the nonlinear case is obtained.