Resonant Excitation of the Edge Baroclinic Waves in the Presence of Ekman Friction
The quasigeostrophic dynamics of flow disturbances with a vertical shear is described by the potential vorticity transfer equation. The wave solutions of the equation are represented by boundary baroclinic waves (modes of the discrete spectrum) and singular modes of the continuous spectrum. When the frequencies of these modes coincide, the resonance excitation effect is realized, in which the amplitude of baroclinic waves increases linearly. This effect was studied in the presence of Ekman bottom friction. It is shown that friction suppresses linear growth and leads to the formation of waves with a finite amplitude.