基于望谟X波段雷达的强降水回波特征分析

Analysis of Heavy Precipitation Echo Characteristics Based on Wangmo X-Band Radar

摘要: 通过CIMISS数据选取2018年望谟地区4个区域站及其以上9次短时强降水天气过程，通过分析祥雨D型双极化天气雷达(望谟X波段雷达)用户终端回波分析基本反射率、垂直最大反射率、VIL (垂直累计液态水含量)、回波顶高、回波底高等产品。得出结论：1) 回波生成后向东北移动的概率较大，且短时强降水主要发生在望谟西北部，郊纳，乐旺在3.35˚仰角上才有回波，昂武、麻山在5.25˚仰角上才有回波。2) 得出各类产品特征值如表1。3) 几类产品与短时强降水的雨强是否有相关性，其阈值是否可以区分一般性降水和短时强降水，仍需更多的天气个例进行统计分析。

Abstract: Through the data of CIMISS, the process of 9 short-time heavy precipitation weather events at 4 regional stations and above in Wangmo region in 2018 was selected. The basic reflectivity, vertical maximum reflectivity, VIL (vertical accumulation of liquid water content), echo top height and echo bottom high products were analyzed by analyzing the end-user echo of Xiangyu d-type dual-polarization weather radar (Wangmo X-band radar). We come to the conclusion: 1) After echo generation, the probability of moving to northeast is larger. And the short-term heavy precipitation mainly occurred in the northwest of Wangmo, Jiaona, Lewang echo at the elevation angle of 3.35˚, and Angwu and Mashan echo at the elevation angle of 5.25˚; 2) The characteristic values of various products are obtained as shown in Table 1; 3) Whether there is a correlation between several types of products and the rainfall intensity of short-time heavy precipitation and whether the threshold can distinguish between general precipitation and short-time heavy precipitation require more statistical analysis of weather cases.