Comparison and Analysis of Microphysical Characteristics in Mixed Convective-Stratiform Cloud Precipitation over Changsha Area
Based on the comparison and analysis of characteristics of the two heavy precipitation processes in summer o-ver Hunan province in Changsha on May 12-13,2019 and May 14-15,2020,the characteristics of precipitation are ana-lyzed firstly,the processes are divided into two stages:the stratiform cloud stage and the convective cloud stage,the rain-drop spectrum and its characteristic parameters are compared and analyzed,the results show that the raindrop distribution and precipitation rate are different in different stages of the two processes.In the stage of stratiform ones,the precipitati-on rate is small,the particle diameter is below 3 mm,and the spectrum is narrow,while in the stage of convective ones,the maximum instantaneous precipitation rates are as high as 46.97 mm/h and 114.40 mm/h,at the same time,5.5 mm and 8.0 mm precipitation particles are observed and raindrops have a broad spectrum;the number of precipitation parti-cles is about or below 500,and the sudden increase of the number of precipitation particles lead to the appearance of short-term heavy rainfall;The Z-R relation(Z=ARb)is different in different stages,at the same stage,the values of coef-ficient A vary widely,and b is almost consistent and fluctuates from 1 to 2,while at different stages,A and b have different values,but both show that the values of A and b are larger in the stage of convective ones.
万方数据
维普
