Abstract:Beginning with the primary principles of isentropic potential vorti-city (IPV), "IPV thought" based on the invertibility principle is introduced in this paper. It includes the typical structure induced both by the isolated upper-air IPV anomalies and surface potential temperature anomalies, and quasi-geostrophic and semi-geostrophic theories on the invertibility principle for time-dependent flow. The "IPV thought" is used to interprete the dynamical characteristics of large scale motions, such as the Rossby waves and shear instabilities and so on. Moreover, the method to work out the IPV maps is given, and the applicable forms and limits of the maps are described. And at the same time the compari-sion between IPV maps and isobaric maps are made.

Abstract:In this paper, the observations of the blocking high over the mid-high latitudes in east Asia (45-75°N, 80-120°E) are analysed. The results show that the continous heavy rains in the east part of China often occurred under the conditons with the blocking high circulation. The relation of the major heavy rain zones with the east wind to the south of the East Asian blocking high or with the south branch of the west jet, or with the south boundary of the north wind over the middle latitudes as well as with the axis line of the maximun south wind in the low latitudes are investigated.

Abstract:In this paper, the method to apply the physicas fields to the objective forecast is given based on the article[1]. The advantages of this method are given as well as.