一次典型积层混合云降水过程雨滴谱特征

利用激光雨滴谱仪观测到的资料,对2009年8月29日山东省一次典型积层混合云降水过程中雨滴谱特征进行了分析。结果表明:降水强度主要取决于最大雨滴直径,与雨滴浓度也呈正相关性,而与平均直径的关系甚微;本次降水过程中雨滴平均谱以双峰和多峰结构为主,在0.5mm左右处存在峰值;Г分布各拟合参数随时间起伏变化趋势一致,强降水时段中各拟合参数起伏变化缓慢,各值基本保持在同一水平;建立了雷达回波强度与降水强度之间的相关关系。

Raindrop Spectral Characteristics of Mixed-Cloud Precipitation in Shandong Province

Using the data observed by a laser raindrop spectrometer, the raindrop size distribution characteristics of mixed cloud precipitation of Shandong in 29 August 2009 are analyzed. It is found that precipitation intensity is decided by the maximum diameter, and correlated positively with the density of raindrops, having week relationship with the average diameter. In the precipitation, the raindrop sizes show bimodal and multi peak distribution mainly, with the peak around 0.5 mm. The temporal variations of the fitted Gamma distribution parameters are slow and have consistent tendencies. The relationship between radar echo intensity and rain intensity is set up.