基于激光雨滴谱仪的一次降水云滴谱特征分析

An Analysis of Precipitation Cloud Distribution Characteristics Based on Laser Precipitation Monitor

利用2012年4月30日湖北省发生的一次降水过程中收集到的地面雨滴谱资料,对不同站点对流性降水和层云性降水雨滴谱特征进行分析,并将激光雨滴谱所测降水与自动站雨量计降水进行对比分析。研究表明:不同类型降水粒子平均体积直径、优势直径、中数体积直径差异显著;对流性降水粒子谱为单峰型分布,层状云降水粒子谱为双峰型分布特征;激光雨滴谱仪和自动站雨量计观测到的小时降水量变化趋势基本一致,定量分析发现,激光雨滴谱仪测值相对与雨量计测值存在系统性偏低的情况,且雨强越大,测量偏差越大。

Aprecipitation event on April 30, 2012 occurred in hubei province was observed by using Thies Clima laser precipitation monitor （TCLMP） and raindrop spectrum data was collected. Raindrop spectrum characteristic of convective and straitform precipitation was analyzed at different stations, and then, precipitation observed between TCLMP and automatic station rain gauge were compared. The results showed that： significant differences of Dv （the mean volume diameter）, Dp （the predominant diameter）, Dn（the median volume diameter） existed between these two kinds of precipitation clouds; Convective precipitation raindrop spectrum for unimodal type distribution, and stratified cloud displayed bimodal type distribution characteristic ; Laser raindrop spectrometer and automatic station rain gauge observed precipitation have almost the same change trend, but TCLMP measuring value is systematic relative low, and precipitation intensity is larger, the greater the measurement deviation.