MESOSCALE RAIN BELTS AND RAIN PEAKCLUSTER IN THE MEIYU PERIOD  

作　　者：余志豪 陆汉城 

机构地区：[1]Department of Atmospheric Sciences, Nanjing University [2]Meteorological Institute of Air Force, PLA

出　　处：《Science China Chemistry》1989年第6期737-748,共12页中国科学（化学英文版）

摘　　要：The case of heavy rain on the meiyu front of June 24—27, 1981 is analysed by use of the mesoscale data with 45×45 km×50 hPa grid mesh. It is found that there exist some meso-α scale rain belts embedded in the area of the meiyu front, and a lot of meso-β scale rain peak cluster moving along these rain belts.The meso-α scale rain belts are corresponding to the mesoscale convergence lines and the tilting rotor circulation cells. Since the isentropic slope is relatively steep there, and even appears in folding, it satisfies the criterion of the conditional asymmetric instability. Thus, it can be recognized that the meso-α scale rain belts are triggered by the developing inertial-gravitational waves. However, the meso-β scale rain peak clusters are corresponding to the inertial-gravitational waves with the mixed vertical structure, which basically satisfies the instable criterion of the transversal waves.The case of heavy rain on the meiyu front of June 24—27, 1981 is analysed by use of the mesoscale data with 45×45 km×50 hPa grid mesh. It is found that there exist some meso-α scale rain belts embedded in the area of the meiyu front, and a lot of meso-β scale rain peak cluster moving along these rain belts.The meso-α scale rain belts are corresponding to the mesoscale convergence lines and the tilting rotor circulation cells. Since the isentropic slope is relatively steep there, and even appears in folding, it satisfies the criterion of the conditional asymmetric instability. Thus, it can be recognized that the meso-α scale rain belts are triggered by the developing inertial-gravitational waves. However, the meso-β scale rain peak clusters are corresponding to the inertial-gravitational waves with the mixed vertical structure, which basically satisfies the instable criterion of the transversal waves.

关 键 词：meso-α and-β scale inertial-gravitational waves  conditional asymmetric instability. 

分 类 号：O6[理学—化学]