Effects and Mechanisms of Topography on Lightning Activity over Taiwan Island
The horizontal and vertical distributions of lightning over Taiwan Island are researched using the lightning localization data observed by TRMM’s Lightning Imaging Sensor (LIS) and high resolution topography data. In the months of July and August, lightning density varies with terrain height. Lightning density reaches its maximum over the areas with terrain of about 200 m, and gradually decreases with terrain height until altitude is near 2300 m. After that, it increases a little again until the terrain height is 2800 m. High lightning density centers are found in the southwestern part of the island. The effects and mechanisms of topography on convection over Taiwan are discussed by comparing lightning density distributions to terrain and low level flow. The high (low) lightning density centers are associated with the areas with upslope (downslope) flows. It reveals that the major mechanism of convection in Taiwan Island is the upslope effect which is due to the joint contribution by topography and low level flows.
Jianhua Dai Yuan Wang Lei Chen Hong Lin
Department of Atmospheric Sciences, Key Laboratory of Mesoscale Severe Weather of Ministry of Educat Department of Atmospheric Sciences, Key Laboratory of Mesoscale Severe Weather of Ministry of Educat Shanghai Meteorological Center, Shanghai Meteorological Bureau, Shanghai 200030, China
国际会议
第13届国际大气电学会议(The 13th International Conference on Atmospheric Electricity)
北京
英文
2007-08-13（万方平台首次上网日期，不代表论文的发表时间）