Analysis on the Influence of Complex Terrain on Cloud-ground-lightning and Precipitation in Southwest China
Based on the cloud-ground-lightning location data monitored by the ADTD lightning loca-tion system and hourly surface precipitation observation data from 1686 automatic weather stations in Chongqing during the summer(from June to August)of 2016-2020,combined with DEM elevation data,this paper studies the characteristics of cloud-ground-lightning activity and precipitation changes under three different terrain conditions(basin,hills and high mountains)in Southwest China.The results show that the lightning activity gradually weakens and precipitation gradually increases from the basin,hills to high mountain areas.The precipitation in the basin area is mainly contributed by precipitation intensity,while in the hilly and high mountain areas,it mainly comes from the contribution of precipitation frequency.The cloud-ground-lightning is closely related to the distribution of short-time severe precipitation.The daily variation characteristics of severe convection activities vary greatly under different terrain conditions.From west to east,severe convection systems in the basin,hills,to high mountain areas gradually turn from nighttime dominant type into daytime dominant type.The RPF of Chongqing is 0.24×108-3.74×108 kg·fl-1,and complex terrain has a significant impact on it.Its value increases linearly with eleva-tion and decreases linearly with increasing flash frequency.Topographic uplift is beneficial for triggering convective activities,but not conducive to the continuation and development of deep convection activities.
cloud-ground-lightningprecipitationcomplex terrainSouthwest China
万方数据
维普
