广义湿位涡理论及其应用研究

The Theory of Generalized Moist Potential Vorticity and its Applicative Study

押重点介绍了诊断暴雨落区与强度的广义湿位涡理论研究方面的两个内容,一是由于暴雨系统中强降水引起的质量亏空导致的暴雨系统中质量强迫下的湿位涡异常理论,二是非均匀饱和大气中的广义湿位涡理论;对暴雨系统中质量强迫的物理意义和非均匀饱和大气中的广义位温引入的思路与意义作了详细说明,并对位涡理论作了细致推导。在此基础上,针对暴雨个例,利用质量强迫的湿位涡异常和非均匀饱和广义湿位涡异常诊断了暴雨落区,从理论和诊断上论证了利用这两种湿位涡异常判断暴雨落区的可行性。

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.