2014~2017年西安终端区闪电特征分析

Analysis of Lightning Characteristics in Xi’an Terminal Area in 2014-2017

摘要: 利用陕西省2014年1月~2017年12月年地闪资料，对西安机场终端区闪电的时间、强度变化特征、密度分布特征进行了统计分析。结果表明：西安终端闪电主要集中分布在夏季(6~8月)，呈单峰型分布特征，时段上主要集中在15~19时；在总闪电次数中负闪占绝大多数，正闪强度明显大于负闪；闪电主要集中在西安机场终端区的东部，其闪电发生的频次约为西部的2倍；负闪强度在机场终端区分布较为均匀；终端区南部正闪强度大于北部，约为北部的2倍。

Abstract: Using the ground lightning data from January 2014 to December 2017 in Shaanxi Province, the time-varying feature, intensity change and density distribution characteristics of lightning in the terminal area of Xi’an Airport were statistically analyzed. The results show that the lightning in Xi’an terminal is mainly concentrated in summer (June-August), and it has a single-peak distribu-tion. It is mainly concentrated at the time of 15 - 19. Negative flashes account for the vast majority of total lightning flashes, and positive flash intensity significantly greater than negative flashes; lightning is mainly concentrated in the east of the terminal area of Xi’an Airport, and the frequency of lightning occurrences is about twice that of the western part. Negative flash intensity is evenly distributed in the terminal area of the airport. The intensity of the positive flash in the south of the terminal area is greater than that in the north, which is about twice that in the north.