2009—2010年梅雨锋暴雨雨滴谱特征  

Characteristics of raindrop size distribution of rainstorm on Meiyu front during 2009—2010

作　　者：陈磊[1] 陈宝君[2] 杨军[1] 濮江平[3] 刘慧娟[4] 高正华[5] 

机构地区：[1]南京信息工程大学大气物理学院,江苏南京210044 [2]南京大学大气科学学院,江苏南京210093 [3]解放军理工大学气象海洋学院,江苏南京211101 [4]安徽省人工影响天气办公室,安徽合肥230031 [5]淮南市气象局,安徽淮南232007

出　　处：《大气科学学报》2013年第4期481-488,共8页Transactions of Atmospheric Sciences

基　　金：国家自然科学基金资助项目(41175118);公益性行业(气象)科研专项经费项目(GYHY201306040)

摘　　要：2009、2010年夏季利用Parsivel激光降水粒子谱仪在淮南和南京同时观测到两次梅雨锋暴雨过程,获得了3 617个雨滴谱样本资料。采用阶矩法对Gamma函数进行拟合,分析了梅雨锋暴雨降水微结构特征。结果表明:主雨带和雨带边缘的雨滴谱存在明显差别,处于主雨带中的降水粒子尺度明显大于雨带边缘的粒子尺度;梅雨锋暴雨过程中0.25mm<D≤1.0mm的粒子所占比例最大,但对于雨强贡献最大的则是1.0mm<D≤2.0mm的粒子;雨滴谱谱型以双峰型为主,几乎不存在无峰型;与其他微结构特征量不同的是,雨滴谱峰值直径Dp随着雨强的增大先增加后减小,而雨滴谱分布参数N0、μ、λ则随着雨强的增大而一直减小,其中μ-λ间存在较好的二项式函数关系;梅雨锋暴雨的Z-R关系为Z=212R1.38。Using the Parsivel laser precipitation particle spectrometer,3 617 samples of raindrop size dis- tribution of Meiyu front rainstorm were observed in Huainan and Nanjing during summer of 2009- 2010. Gamma raindrop size distribution function is fitted by moment method, and the micro-structure of Meiyu front rainstorm is analyzed. Results show that the sizes of precipitation drops in rain belt are lar- ger than those on the edge of rain belt. Contributions to total number concentration of raindrops with di- ameter of 0. 25-1.0 mm are the maximum, but those to total rainfall intensity of raindrops with diame- ter of 1.0-2.0 mm are the maximum. The raindrop size distributions of Meiyu front rainstorm mostly show double peak type, without non-peak type. The peak diameter of raindrop size distribution of Meiyu front rainstorm first increases and then decreases with the rainfall intensity. However, the parameters of Gamma distribution, NO ,μ and A always decrease with the rainfall intensity, and there is a good binomi- al function relationship between μ and λ. In addition, the Z-R relationship of Meiyu front rainstorm isZ = 212R^1.38.

关 键 词：梅雨锋 雨滴谱 GAMMA分布 Z-R关系 

分 类 号：P426.62[天文地球—大气科学及气象学]