Chih-hsien Wei, Tai-hwa Hor and Mau-hsing Chang

Dept. of Applied Physics, Chung Cheng Institute of Technology

National Defense University

ABSTRACT

Currently, there are seven modernized Doppler radar sets deployed around the Taiwan Island. This radar arrangement seems over-intensive for weather surveillance and quite feasible for the dual Doppler analysis. But, due to the complexity and variety of topography in Taiwan, the single Doppler analysis is still the necessary approach for severe weather reconnaissance and warning. The purpose of this study tries to get more detailed and correct wind information from the radial wind fields based on the CAA single Doppler radar observations by using sounding data, selected peak values and making some subjective assumptions. First of all, the real wind field is analyzed in use of the radial wind on CAPPI diagrams calculated from single Doppler data. And then, the analyzed real wind field is executed to obtain the estimated radial wind field which will be compared with the observed radial wind field. The preliminary results show the approach can improve the understanding of the dynamic forcings of mesoscale convective systems in the vicinity of the Mei-yu frontal system over the coastal line area.

Key word: frontal leading, Doppler analysis