积层混合云降水雨滴谱特征分析  

Precipitation characteristics related to raindrop size distribution in laminated hybrid cloud

作　　者：李景鑫[1] 牛生杰[2] 王式功[1] 郝天依[1] 

机构地区：[1]兰州大学大气科学学院,兰州730000 [2]南京信息工程大学大气物理学院,南京210000

出　　处：《兰州大学学报（自然科学版）》2010年第3期56-61,共6页Journal of Lanzhou University(Natural Sciences)

基　　金：国家科技支撑计划项目(2007BAC29B03;2008BAC40B04;2009BAC53B02)

摘　　要：研究了雷州半岛积层混合云雨滴的微结构参量特征,用2007年8月8日至11日在广东湛江和遂溪观测获取的295个降水雨滴谱样本.根据雨滴瞬时谱和有关物理量的演变特征,分别得到了数浓度、雷达反射率因子和雨水含量与雨强的变化关系,给出了雨滴谱的Γ分布拟合和参数随时间的变化特征,得出三次积层混合云降水的平均谱Γ分布,可以描述为N=58 859.634 29D^(7.403 805) exp(-4.816 26D).这些结果可作为检验标准与雷达回波资料进行比较,确定降水的性质和定量估量降水;还可以通过地面连续雨滴谱数据推测空中雨滴谱的基本特征,从而完整地认识整个降水过程.The micro-structural characteristics of rain in Leizhou peninsula were studies,with the rain cloud being of a laminated mixed type.The data used were 295 samples of precipitation obtained on August 8-11,2007 from Zhanjiang and Suixi in Guangdong province.The correlation between radar reflectivity factor,water content and rainfall intensity was established.Then a curve fitting ofΓdistribution was made and the parameter changes with time were analyzed.The average spectrum of can be described as N=58 859.634 29D^（7.403805） exp（-4.816 26D）.These results can be used as a test in comparison with the radar echo to determine the nature of precipitation and to estimate the quantity of precipitation.The raindrop size distribution in midair can also be calculated through the spectral features of ground to completely understand the whole process of precipitation.

关 键 词：积层混合云 Γ分布函数 雨滴谱 

分 类 号：P426[天文地球—大气科学及气象学]