부산대학교 도서관

Based on the detection of dual-polarized radar, combined with the observation data of lightning, parts of the radar observation products are analyzed for some lightning weather processes occurred in Guangzhou. By studying the variation characteristics of these products before and after the first flash, the lightning nowcasting method based on radar data is offered. In the process of studying radar parameters variation of lightning weather, this paper analyzes the characteristics of radar echoes in different time periods, counts the distribution of polarization parameters, and judges the development process of thunderstorms according to the echo intensity and echo area of different stages. The results show that during lightning, the echo intensity Z, the echo top height ET, the differential reflectivity factor Zdr, the differential propagation phase shift rate Kdp and the vertical accumulated liquid water content VIL of the convective cloud have obvious changes. The radar detection of polarized weather can realize the discrimination of thunderstorm formation state and lightning warning.