江苏省区域闪电分布特征

利用2006-2010年江苏省气象部门闪电定位系统的观测资料，对南京、苏州、徐州、南通和连云港5个代表性地区闪电频数的季节、月、日变化和空间分布特征以及闪电强度分布区间进行对比研究，探讨了各地闪电分布差异和全省闪电活动特征。结果表明，5个地区四季负闪均多于正闪；闪电频数年变化显著，南京峰值出现在7月，其他地区出现在8月；闪电日变化特征明显，各地区峰值出现在14：00—17：00。全省闪电频数的空间分布不均衡，苏南大于苏北和苏中地区，南京、镇江、常州部分地区分布着多个闪电密集中心。大部分闪电强度集中在20～50kA，100kA及以上的闪电很少，各地区正闪强度均高于负闪。

Regional distribution of lightning in Jiangsu

Based on the lightning location system data of Jiangsu Meteorological Bureau from 2006 to 2010 ,this paper analyses the seasonal,monthly and daily variations,and spatial distribution of lightning frequency, and the distribution interval of lightning intensity over the five representative areas （Nan- jing, Suzhou, Xuzhou, Nantong and Lianyungang） in Jiangsu Province, which can reflect the distribu- tion differences and characteristics of lightning activity. Results show that the negative lightning fre- quency are more than the positive in the five areas in four seasons. The monthly lightning frequency changes obviously in each area, and the peak appears in Nanjing in July and in the other areas in Au- gust. The daily variation of lightning frequency is obvious in each area ,and the peak appears at 14：00-- 17：00 BST. The spatial distribution of lightning frequency are unbalanced in the whole province, and there are more（less） lightning in the southern（ northern and central） Jiangsu, with many lightning den- sity centers in parts of Nanjing, Zhenjiang and Changzhou. Most of lightning intensity centralize 20-50 kA, while there are very few for the lightning intensity ning intensity is stronger than the negative. more than 100 kA. Moreover, the positive light-ning intensity is stronger than the negative.