Some Characteristic Features of l3arotropic Disturbances (II)

[摘要] Kinetic energy exchange between a mean flow and a superposed disturbance in a two dimensional non-divergent fluid is investigated for a special example.It is found that, at initial moment, kinetic energy is transferred from the disturbance to the mean flow, if the mean flow has a scale which is smaller than the scale of the disdisturbance. Kinetic energy is transferred in the opposite direction if the opposite situation occurs.The mean flow kinetic energy reaches an extremum value after time Θ, which is a characteristic quantity, determined by the initial field of the fluid system. After then, the change of the mean flow energy occurs in opposite sense.Earth's rotation has a stabilizing effect in the sense that, it has a tendency to keep the state of the mean flow in the original one.

[学科分类] 大气科学