利用激光降水粒子谱仪研究雨滴谱分布特性  

Characteristics of gamma raindrop size distribution based on the precipitation particle spectrometer

作　　者：濮江平[1,2] 张伟[2] 姜爱军 张卉慧[2] 王可法 

机构地区：[1]南京信息工程大学,南京210044 [2]解放军理工大学,南京211101 [3]南京市气象局,南京210008 [4]江苏省气候中心,南京210008

出　　处：《气象科学》2010年第5期701-707,共7页Journal of the Meteorological Sciences

基　　金：国家自然科学基金重点资助项目(40533015);国家科技支撑计划项目(2006BAC12B02);江苏省气象局科研基金(K200715)

摘　　要：利用Parsivel激光降水粒子谱仪2009年3—6月在南京观测获取雨滴谱资料,分类对各次降水过程雨滴谱进行Gamma分布拟合,对比分析了南京地区不同云系降水的雨滴谱分布特征以及Gamm a分布参数相关特性,并且讨论了"标准化"Gamma分布参数随雨强及雷达反射率因子的变化关系。结果表明:用Gamma分布拟合本次试验不同云系降水的雨滴谱分布精度都比较高;"标准化"的Gamma分布参数较Gamma分布参数更具有物理意义,且其参数μ和Dm与雷达反射率因子Z均具有较佳的对应关系,μ随Z的增大依次递减,Dm则随Z的增大呈指数型递增。Using the precipitation data observed by a laser optical Precipitation Particle Spectrometer,from March to June,2009,Gamma Rain Drop Size Distribution（Gamma DSD）function is assumed and the parameters of the function are determined by moment method.Characteristics of Gamma DSD and its parameters of precipitation of different types are analyzed.Moreover,the relationship between the parameters of ＂Normalized＂ Gamma DSD and rainfall rate is discussed,as well as the parameters and radar reflectivity factor.The result shows that the precision of different types of precipitation fitted by Gamma DSD in this experiment is available.As compared to the parameters of Gamma DSD,the parameters of ＂Normalized＂ Gamma DSD is more significant.When the radar reflectivity factor（Z） increases,the parameter μ gradually decreases,but the other parameter Dm increases exponentialy.

关 键 词：雨滴谱 GAMMA分布 激光降水粒子谱仪 阶矩法 

分 类 号：P412[天文地球—大气科学及气象学]