基于激光粒子探测仪探测结果的Z-I关系分析  

Analysis on Relationships of Radar Reflectivity and Rain Rate Based on the Raindrop Spectra

作　　者：班显秀[1] 耿树江[1] 袁健[1] 

机构地区：[1]辽宁省人工影响天气办公室,辽宁沈阳110016

出　　处：《安徽农业科学》2008年第33期14674-14679,共6页Journal of Anhui Agricultural Sciences

基　　金："十一五"辽宁省科技厅重点攻关项目(2006210001)

摘　　要：[目的]估测高时空分辨率的降水量。[方法]利用翻斗式自动雨量计观测的雨量和雨强对激光粒子探测仪的观测结果进行验证,在确信通过激光粒子探测仪激光带的雨滴数和雨滴直径的基础上,按年、月、主要降水天气类型分别建立雷达反射率因子Z和雨强I、log(Z)-log(I)和雷达回波强度I-Zo的指数关系式。[结果]结果表明,按4种主要降水天气类型建立的Z-I、log(Z)-log(I)和I-Zo的指数关系式拟合率最高,相关系数都在0.96以上,均通过极显著相关性检验,是利用雷达探测的反射率因子(Z)或回波强度(Zo)反演降雨强度的首选。给定回波强度(Zo)后,对应1个最大雨强(Imax)。[结论]利用这种关系,依据雷达探测的回波强度,对预警强降水天气有重要的指示作用。[Objective] The propose was to measure precipitation of high spatial and temporal resolution. [Method]The observation results of laser particle detector were validated by observing precipitation and rain intensity data with automatic tipper-hopper type rain gauge. Based on the reliability of the droplet＇s numbers and diameter, the formula of index relation about log（ Z）-log（I） and l-Zo was founded according to year, month and main types of weather during rain fall weather. [Result]The results indicated that the fitting rate of exponent relationship of Z-I,log（ Z）-log（1） and I-Zo established according to 4 kinds of main precipitation weather was highest, all correlation coefficients were over 0. 96 and got across significant correlation test. The exponent relationship of Z-I,log（ Z）-log（I） and l-Zo established according to 4 kinds of main precipitation weather was first choice which the rain intensity was inversed using reflectivity factor （ Z）detectod by radar or echo intensity（ Zo ）. There was a rmximurn rain intensity（Imax） when echo intensity was given. [ Conelusion] Using above relation can offer some important information that forecast strongly rain weather according to the echo intensity of radar probing.

关 键 词：雨滴谱 雨强 Z-I关系 

分 类 号：P414.9[天文地球—大气科学及气象学]