沈阳一次西风槽降水过程的雨滴谱特征分析  

Features of Raindrop Size Distributions of a Westly Through in Shenyang

作　　者：班显秀[1] 袁健[1] 王永亮[1] 

机构地区：[1]辽宁省人工影响天气办公室,沈阳110016

出　　处：《沈阳农业大学学报》2008年第2期145-151,共7页Journal of Shenyang Agricultural University

基　　金："十一五"辽宁省科技厅重点攻关项目(2006210001)

摘　　要：利用粒子激光探测仪、翻斗式自动雨量计和新一代天气雷达对沈阳春季一次西风槽降水天气进行了同步观测研究,对3种仪器观测信息的分析结果表明:翻斗式自动雨量计观测的降雨强度和累积雨量与粒子激光探测仪(Parsivel)的观测结果一致,表明粒子激光探测仪在不同速度、直径等级观测的雨滴数是可信的;谱宽和降水粒子数随时间变化同步,决定了降雨强度。且直径大于1mm的雨滴是降水的主要部分;建立了反射率因子和雷达回波强度与降雨强度和空中雨水含量的指数关系式,为雷达探测降雨强度和空中雨水含量提供了计算模式;在谱宽随时间变化平缓时,粒子激光探测仪观测的回波强度与雷达观测的回波强度基本一致,可用激光探测仪观测的回波强度标校雷达观测。A thunder shower was observed simultaneously in Shenyang spring with the particle laser-based optical measurement, the rolling udometer and the new generation weather radar. From analyzing these observational data the results showed that the rain intensity and the accumulated precipitation with the rolling udometer were the same as that of the particle laser-based opti- cal measurement. These results showed the reliant of raindrop number observed at different velocity and diameter class with par- ticle laser-based optical measurement. The rain intensity was decided by spectrum width and raining particle number that varied with time. The general diameter of raindrop was bigger than one millimeter. The exponential relation between reflectivity factor and radar echo intensity with rain intensity and total water was set up. The computing model for probing rain intensity and air water content with radar was developed. The echo intensity of observations with the particle laser-based optical measurement was basically consistent with that of radar observations when spectrum width varied with time.

关 键 词：雨滴谱 降雨强度 反射率因子 Z-I关系 

分 类 号：S252.9[农业科学—农业机械化工程]