山东秋季积层混合云云物理结构个例分析

目的]分析山东秋季一次积层混合云云物理结构。方法]综合利用多普勒雷达资料、激光雨滴谱仪观测的雨滴谱资料、L波段探空秒数据以及其他常规资料,分析了2009年8月29日积层混合云云物理结构。结果]这是一次典型的积层混合云降水过程,主体降水持续10 h,雨强最大为6.5 mm/h,一般雨强3.0 mm/h,雨强随时间有明显的起伏变化。雨滴浓度为5～300个,雨滴谱以双峰和多峰型为主。探空秒数据分析的云垂直结构显示,降水云以冷云为主,暖层发展不充分。多普勒雷达资料分析表明,整个降水过程可以分为4个阶段:降水前期、初始、发展成熟和减弱阶段,不同阶段的回波结构明显不同。结论]该研究为探讨此次降水机制和人工增雨潜力奠定了理论基础。

Case Analvsis on Physical Characteristics of Autumn Cumulus-stratus Mixed Cloud in Slandong Province

Objective] The aim was to analyze physical structures of mixed cloud in autumn in Shandong.Method] By dint of Doppler radar data,the raindrop spectrum data observed by laser spectrometer,second sounding data of L-band,satellite retrieval data,and other general information,the physical structures of mixed cloud in autumn on August 29,2009 were discussed.Result] This was a typical precipitation process of mixed cloud,and the main precipitation process lasted for 10 hours.Rainfall intensity was ups and downs obviously with the time.The maximum rainfall intensity was 6.5 mm/h and the normal of that was less than 3.0 mm/h.The rain concentrations were between 5 and 300,and the raindrop size distribution was mainly by bimodal or multimodal peaks.It was showed by the vertical structure of clouds which analyzed by second sounding data,that the precipitating cloud was mainly to the cold cloud and the development of warm layers was not well.It was showed by the Doppler radar data that the whole precipitation process was divided into four stages: prior period and initial,mature,decline stages for precipitation,which the echo structure of different stages was quite different.Conclusion] The study laid theoretical basis for the study on precipitation mechanism and artificial precipitation potential.