Analysis of time and spatial distribution of Lightning Characteristics in Shanghai
Based on lightning data in the past 2 year(2005~2006), collected by the lighting positioning system(SAFIR3000) in Shanghai, A study made of the daily and monthly lightning variation, as well as lightning intensity, polarity and density, etc., and the climatic characteristics of lightning in Shanghai is analyzed. The results showed: the most flashes are negative; the mean intensities of positive flashes are bigger than those of the negatives. The occurrence of lighting is obvious monthly and diurnal change. The maximum number of thunderstorm days was found in July, and lightning occurs most frequently in July, too; There are two peak periods in the temporal distribution, 5:00~7:00 and 15:00~18:00. By studying the density, high-density CG appears in some entertain districts, such as water body or downwind of water body, and rough dry areas. The spatial distribution of lightning is related to the topography and the nature of the underlying surface. Lightning activity and surface moisture conditions have close relationship. The spatial distribution of CG+ and that of CG- have great difference that show thunderstorm cloud charge structure is different.
Yudan Gu Jianhua Dai Xiaodong Xu
Shanghai Lightning Protection Center, Shanghai 201615, China Shanghai Weather Forecaster Center, Shanghai 200030, China Shanghai Lightning Protection Center, Shanghai 201615, 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）