Numerical simulation and structure analysis of typhoon MATSA (0509)

The dynamical and thermodynamic characteristics of typhoon Matsa (0509) were analyzed in vertical circulation, vorticity, divergence and temperature/humidity structure, based on the successful simulation in terms of track, intensity and internal structure of Matsa by using the high resolution mesoscale model MM5. The results show that the obviously asymmetric distribution of cyclone low-level structure effects the development of mesoscale systems and the precipitation. The modified non-geostrophic wet Q vector convergence centre and the positive vorticity filed on the 500 hPa upper level is directly associated with the position of heavy rain caused by the typhoon.EI03385-3904