2010—2013年海南岛地闪活动的特征分析  

Preliminary analysis of cloud-to-ground flashes in Hainan Island from 2010 to 2013

作　　者：余海[1] 张廷龙[1] 高燚[1] 劳小青[1] 韦昌雄 范祥鹏[2] 

机构地区：[1]海南省防雷中心,海口570203 [2]中国气象科学研究院,北京100081

出　　处：《中国科学院大学学报（中英文）》2016年第2期195-203,共9页Journal of University of Chinese Academy of Sciences

基　　金：国家自然科学基金(41375011);海南省气象局科技创新项目(HN2013MS17)资助

摘　　要：利用海南省地闪定位网获取的4年(2010年1月至2013年12月)地闪定位资料,详细分析海南岛地闪活动的时空分布特征.结果显示,海南岛的地闪活动主要发生在4—10月;呈双峰特征,峰值分别出现于5月和8月,分别约占全年总地闪数的23%和18%;地闪活动在6—7月明显地间歇性减少.从日变化特征来看,地闪在14:00—20:00时段最为频繁.16:00左右达到峰值,而5:00左右有一个较弱的峰值,2个峰值所占比例分别约为11.3%和4.2%.通过对比分析各地区的地闪活动,发现日变化呈现双峰特征的区域主要集中在东、南和西部沿海地区,而中部内陆及靠近琼州海峡的北部沿海地区呈单峰值特征.海南岛中部内陆山区的地闪密度大,沿海地区地闪密度小,并且存在2个地闪密度高值区.Based on the four years＇ data （2010-2013） of cloud-to-ground （CG） flashes detected by the VLF lightning locating networks in Hainan province, the temporal and spatial variation characteristics of CG flash activities were analyzed in detail. The results indicated that CG flashes mostly occurred between April and October and two peaks of CG activity appeared in May （23%） and August （ 18% ）. The lightning activities showed intermittent decrease in June-July. The diurnal variation of CG flashes showed that the CG flashes more frequently occurred between 14：00 and 20 ： O0 and there were two peaks appearing at 16：00 （about 11.3%） and 5：00 （about 4.2%）, respectively. By analyzing CG flash activities in different regions, we found that the diurnal variation of CG activities usually presented double peaks in the coastal regions, except the northern coastal area near Qiongzhou strait and the inland regions. The largest CG flash density occurred in the inland mountainous regions, and the flash density showed a decreasing trend from inland to coasts. In addition, there were two maximum values of the CG flash density.

关 键 词：地闪 日变化 双峰 地闪密度 

分 类 号：P446[天文地球—大气科学及气象学]