一次层状云降水过程中微雨雷达探测精度分析

Precision Evaluation of Micro Rain Radar Observations during a Stratiform Cloud Precipitation Process

针对2019年9月11—13日受槽底部扩散冷空气和高原暖湿空气共同影响下的六盘山区一次层状云降水过程,利用六盘山气象站、大湾人工影响天气标准化作业点布设的微雨雷达、雨滴谱仪和雨量计,对不同时段、不同高度降水量进行统计和对比。结果表明,微雨雷达、雨滴谱仪与雨量计5 min累计降水量具有较好的一致性,微雨雷达和雨滴谱仪的降水开始时间提前于雨量计;微雨雷达灵敏度高于雨滴谱仪,且微雨雷达降水量观测值优于雨滴谱仪;微雨雷达和雨滴谱仪雨强偏差在2.0 mm/h以内。

In view of a stratiform cloud precipitation process in Liupanshan mountain area from September 11 to 13,2019,which is affected by the diffusion of cold air at the bottom of the trough and the warm and humid air of the plateau,the precipitation in different periods and at different altitudes is analyzed and compared by using the micro rain radar,raindrop spectrometer and rain gauge arranged at Liupanshan meteorological station and Dawan weather modification standardized operation point.The results show that the micro rain radar,raindrop spectrometer and rain gauge display the same trend in the 5-minute cumulative precipitation,but the precipitation start time tested by the micro rain radar and raindrop spectrometer is earlier than that of the rain gauge.Additionally,the sensitivity of the micro rain radar is higher than that of the raindrop spectrometer,and the precipitation observation value obtained by the micro rain radar is better than that of the raindrop spectrometer.The deviation of rain intensity analyzed by the micro rain radar and the raindrop spectrometer is within 2.0 mm/h.