The Theory of Generalized Moist Potential Vorticity and its Applicative Study

In this paper, two points are focused on, associated with the application of the theory of generalized moist potential vorticity (GMPV)for diagnosing the location and intensity of torrential rain. One is moist potential vorticity (MPV) anomaly due to the large mass forcing induced by heavy precipitation; The other is the theory of generalized moist potential vorticity (GMPV) anomaly in the non-uniformly saturated moist atmosphere. Both the physical meanings of mass forcing during rainfall process and the idea of introducing the generalized potential temperature in non-uniformly saturated flow are explicated in detail. Then the potential vorticity is derived. On the basis of above studies, the locations of torrential rains are diagnosed by using the MPV anomaly due to mass forcing and GMPV anomaly in non-uniformly saturated moist flow in rainfall cases. Therefore both the theory and application in rainfall case prove that it is feasible to diagnose location of torrential rain by using the two types of MPV anomalies.