Statistical Method of Thunderstorm Day
Jiahong Chen · Gao dianya jishu · 2006
For better application of lightning location system(LLS)'s data in statistic of thunderstorm day(T_d),a new and appropriate grid method for automatic detecting data's statistic of T_d is presented on the basis of comparing the meteorologic monitoring data and the automatic detection data.In grid method,a grid is considered to be a lightning statistic unit.The lightning parameters in an area can be received from the statistics of the lightning parameters in the grid.This method not only reserves conventional concept about T_d,but also realizes the transition from manual statistic to automatic statistic.LLS's automatic detection data of 5 years(2001~2005) and 13 years' meteorologic data in Fujian province are analyzed and compared in this paper.The results show that grid method is detailed and reasonable in carving up statistical areas,and the statistical value of Td comparable with conventional meteorologic T_d.Meteorologic data are needed as source for tracing in grid method,and the meteorologic T_d gotten by long-time monitoring is the reference staffs to select the statistical grid in grid method.The statistical results also show that 0.15°×0.15° reseau is appropriate for statistic of average T_d,and 0.2°×0.2° reseau is appropriate for statistic of maximal T_d in Fujian.