NUMERICAL SIMULATION OF MEDIUM SCALE DISTURBANCE ON MEIYU FRONT
Gao Kun Li Yufang Huang Anli(Department of Geography, Hangzhou University)
Uning a 10-level 90 km-mesh mesoscale numerical model, we make a numerical simulation of a heavy rain case during the meiyu season over the middle reaches of the Changjiang River. Model output is separated into synoptic and medium scale with a selective filtering operator. The analysis lays emphasis on the characteristics of the medium scale disturbance linked with heavy rain and its synoptic scale environment. We suggest that the development of the medium scale disturbance and accompanying precipitation be due to instability of gravity inertial waves under certain synoptic scale condition.