雨滴谱及其特征值水平分布的个例分析

本文用一次个例观测分析了水平距离上雨滴谱及其特征值的不均匀性。结果表明:西安春季层状云降水,在60km水平距离上(拔海高度1.6—1.7km),有三个明显的雨滴数浓度和雨强峰值,雨强峰值主要是由直径大于0.083cm的雨滴数浓度增加造成的,它们占雨强的80％以上。 在雨强峰,谷值处,对应的雨滴谱及其特征值明显不同,雨强峰值时,雨滴效浓度较大,尺度谱较宽,各种大小粒子(D≥0.034cm)数浓度空间不均匀性较小,而在雨强谷值时,则相反。 各瞬时雨滴谱可用指数分布N=N_0exp-λD]来拟合,但相关显著水平α<0.01的样本仅占总样本的71.8％。

A case study of raindrop spectra and its characteristic parameters along horizontal level

This paper analysed variety ef raindrop spectra and their characteristic parameters along a horizontal level. Within horizontal scale ranging 60km (elevation 1.-1.8km) Existed apparently three peaks of raindrop concentration and precipitation intensity.Raindrop spectra and their characteristic parameters were different at peaks and troughs of precipitation intensity. Raindrop spectra may be fitted with exponential form n(D) = NO exp (-XD). Samples of correlation signification level a<0.01 hold 71. 8% of total samples.