INFLUENCEOF ENVIRONMENT PARAMETERS ON INSTABILITY OF GENERALIZED EADY' S MODEL

The baroclinic instability in generalized Eady's models is introduced and the influence of environment parameters on the instability is emphatically discussed. Not only in the model there exists the "short-wave cut-off" phenomenon similar to the classical Eady's model, but also there exists the "long-wave cut-off" phenomenon, which does not exist in the classical Eady's model. The former is not almost sensitive to environment parameters, but the latter is. The decrease of static stability parameter, the accretion of the vertical shear of the basic flow in the model bottom, the increase of latitude and decrease of the height of the model top are propitious to the instability in the model. The most instability in the generalized Eady's model appears in the synoptic scale wave range. The variations of amplitude and phase with altitude are analogous to those of the classical Eady's model. The isophase lines incline to west with altitude, but the amplitude is not symmetrical about the middle-level atmosphere.