关键词: 地闪频次, 雷电流强度, 地闪密度

Abstract: Using the data of ADTD (Active Divectory Topology Diagrammer)lightning location system in Anhui province from 2011 to 2013,lightning occurrence frequency,lightning current intensity,lightning temporal and spatial distribution characteristics in the southern mountains Anhui province were analyzed,and compared with those in Anhui province.The results show that lightning frequency in the southern mountains accounts for 28.2% of total value in Anhui province.The average lightning density in the southern mountains is 3.21 times·km^-2·a^-1,while the corresponding value in Anhui province is 2.51 times·km^-2·a^-1.The main type of lightning in Anhui province and its southern mountains is negative.The peak period of lightning appears from June to September.The lightning frequency during this period is 90.8% of the whole value of a year.The lightning in the southern mountain mainly occurs from afternoon to evening.The crucial time-period is 14:00-17:00,and this is similar to that in Anhui province.Lightning current intensity in Anhui province mainly concentrates in 10-50 kA.The percentage of positive cloud-ground lightning increases at the region with a higher lightning current intensity.The average intensity of positive cloud-ground lightning in the southern mountains is 45 kA,and the negative one is 36 kA,which are both slightly lower than those in Anhui province.

Key words: Cloud-ground lightning frequency, Lightning current intensity, Lightning density