新一代天气雷达速度场特征在人工增雨中的应用

Application of New Generation of Weather Radar Velocity Field Characters to Precipitation Enhancement Operation

大同新一代多普勒天气雷达安装已运行7年,期间,运用多普勒雷达天气资料指导人工增雨作业方面取得了很大进步。通过研究两次大范围稳定性降水的速度场演变情况,得出系统加强、维持、消散的图像特征。这两次降水过程是大尺度天气系统造成的大范围降水回波长时间维持与人工增雨作业共同影响的结果。其速度场具有混合性降水回波特征,并且在增雨催化阶段表现显著,可以作为该地区增雨作业识别增雨催化的时机和潜力区域的辅助指标。

The new Doppler Radar have been applied for seven years in Datong City. During the seven years, we have made good process in applying the Doppler radar data to guide the weather modification and accumulated some experi- ences. Based on statistic analysis on Doppler radar data of 2 stable precipitation events, It showed that the large scale weather background which resulted in large range rainfall echoes keeping for long time, and weather modification caused this rainfall process together, and the intensity and the velocity fields present the mixed precipitation echo char- acteristics, especially remarkable during the rainfall enhancement phase. By using these characters as assistant criterions in precipitation enhancement command,according to the results of simulation analysis in this case and based on radar da- ta, the method of detecting appropriate seeding opportunity is discussed by analyzing, forming and developing charac- teristics of convective cell echoes in the entire precipitation process, which provided basis for effective development of artificial rainfall augment process.