Numerical Simulation to Evaluate the Effects of Upward Lightning Discharges on Thunderstorm Electrical Parameters  

作　　者：Tianxue ZHENG Yongbo TAN Yiru WANG 

机构地区：[1]Key Laboratory of Meteorological Disaster,Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Key Laboratory for Aerosol–Cloud–Precipitation of China Meteorological Administration,Nanjing [2]University of Information Science and Technology,Nanjing 210044,China 2State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,Beijing 100081,China

出　　处：《Advances in Atmospheric Sciences》2021年第3期446-459,共14页大气科学进展（英文版）

基　　金：This research was supported by the National Key Research and Development Program of China(Grant No.2017YFC1501504);the National Natural Science Foundation of China(Grant Nos.41875003,41805002);the Open Research Program of the State Key Laboratory of Severe Weather(Grant No.2019LASW-A03).

摘　　要：A theoretical discussion of the discharge effects of upward lightning simulated with a fine-resolution 2D thunderstorm model is performed in this paper,and the results reveal that the estimates of the total induced charge on the upward lightning discharge channels range from 0.67 to 118.8 C,and the average value is 19.0 C,while the ratio of the induced charge on the leader channels to the total opposite-polarity charge in the discharge region ranges from 5.9%to 47.3%,with an average value of 14.7%.Moreover,the average value of the space electrostatic energy consumed by upward lightning is 1.06×10^9 J.The above values are lower than those related to intracloud lightning discharges.The density of the deposited opposite-polarity charge is comparable in magnitude to that of the preexisting charge in the discharge area,and the deposition of these opposite-polarity charges rapidly destroys the original space potential well in the discharge area and greatly reduces the space electric field strength.In addition,these opposite-polarity charges are redistributed with the development of thunderstorms.The space charge redistribution caused by lightning discharges partly accounts for the complexity of the charge structures in a thunderstorm,and the complexity gradually decreases with the charge neutralization process.

关 键 词：numerical simulation upward lightning induced charge variation of charge distribution electrostatic energy 

分 类 号：P427.3[天文地球—大气科学及气象学]