A Comprehensive Observational Analysis for the Effects of Gas Cannons on Clouds and Precipitation  

作　　者：WU Bin WANG Dan-dan LI Yan-fang YIN Hao DU Shuang LI Peng-hong 吴彬;王丹丹;李艳芳;尹浩;杜爽;黎朋红(Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing 210044 China;Huzhou Meteorological Bureau,Huzhou,Zhejiang 313000 China;Changxing Meteorological Bureau,Huzhou,Zhejiang 313000 China;Water Conservancy Bureau of Nanxun District,Huzhou,Zhejiang 313000 China)

机构地区：[1]Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing 210044 China [2]Huzhou Meteorological Bureau,Huzhou,Zhejiang 313000 China [3]Changxing Meteorological Bureau,Huzhou,Zhejiang 313000 China [4]Water Conservancy Bureau of Nanxun District,Huzhou,Zhejiang 313000 China

出　　处：《Journal of Tropical Meteorology》2022年第2期237-251,共15页热带气象学报（英文版）

基　　金：National Natural Science Foundation of China(41675029);Postgraduate Research&Practice Innovation Program of Jiangsu Province(KYCX18_0998);Science and Technology Program of Huzhou(2021GZ14,2020GZ31);Science and Technology(Key)Program of Zhejiang Meteorological Service(2021ZD27)。

摘　　要：To analyze the effects of gas cannons on clouds and precipitation,multisource observational data,including those from National Centers for Environmental Prediction(NCEP)reanalysis,Hangzhou and Huzhou new-generation weather radars,laser disdrometer,ground-based automatic weather station,wind profiler radar,and Lin'an C-band dualpolarization radar,were adopted in this study.Based on the variational dual-Doppler wind retrieval method and the polarimetric variables obtained by the dual-polarization radar,we analyzed the microphysical processes and the variations in the macro-and microphysical quantities in clouds from the perspective of the synoptic background before precipitation enhancement,the polarization echo characteristics before,during and after enhancement,and the evolution of the fine three-dimensional kinematic structure and the microphysical structure.The results show that the precipitation enhancement operation promoted the development of radar echoes and prolonged their duration,and both the horizontal and vertical wind speeds increased.The dual-polarization radar echo showed that the diameter of the precipitation particles increased,and the concentration of raindrops increased after precipitation enhancement.The raindrops were lifted to a height corresponding to 0 to-20℃due to vertical updrafts.Based on the disdrometer data during precipitation enhancement,the concentration of small raindrops(lgN_(w))showed a significant increase,and the mass-weighted diameter D_(m)value decreased,indicating that the precipitation enhancement operation played a certain“lubricating”effect.After the precipitation enhancement,the concentration of raindrops did not change much compared with that during the enhancement process,while the Dm increased,corresponding to an increase in rain intensity.The results suggest the positive effect of gas cannons on precipitation enhancement.

关 键 词：gas cannon multisource observational data radar echo characteristics kinematic structure and microphysical structure disdrometer parameters cloud precipitation effect 

分 类 号：P481[天文地球—大气科学及气象学]