摘要
采用2010—2018年的海南岛天气分型资料和闪电定位数据,统计分析海南岛在西南低压槽影响下地闪发生概率的时空分布特征,结果显示:在西南低压槽天气影响下,海南岛地闪主要出现在4—9月;地闪发生概率月分布曲线呈双峰特性,以8月为主峰、5月为次峰,00—12时(北京时,下同)的地闪发生概率月分布曲线与全天不同,呈逐月上升特征;地闪发生概率和地闪次数时段分布曲线呈单峰特性,峰值均出现在15—18时,除12—21时外其他时段的地闪发生概率和地闪次数都很低,控制过程的后期比前期的闪发生概率和地闪次数略高;00—12时各时段海南岛地闪发生概率中心分布在东南沿海,概率中心值在5%以下,12—21时各时段地闪发生概率中心分布在北部内陆,概率中心由白沙中部向澄迈东部移动,移向呈西南—东北向,15—18时概率中心在澄迈南部达到最大值40%,21时以后概率中心分布在屯昌境内,中心值在5%以下;7—9月各时段的地闪发生概率均比4—6月高,但地闪次数峰值比4—6月少,两者各时段的地闪发生概率的空间分布完全一致。
The spatial and temporal distribution characteristics of the occurrence probability of CG lightning under the influence of southwest low pressure trough were analyzed using the data of weather classification and lightning location from 2010 to 2018 over Hainan Island.The results are as follows:CG lightning mainly appeared from April to September;the monthly distribution curve of the occurrence probability of CG lightning shows a bimodal characteristic,the main peak is in August and the second peak is in May;the monthly distribution curve of the occurrence probability of CG lightning at 00‒12 BT is different from that of the whole day,it is mainly characterized by monthly rise;the time period distribution curve of the occurrence probability and the number of CG lightning show single peak characteristics,both peaks occurred between 15 and 18 BT,except for 12‒21 BT,the occurrence probability and number of CG lightning at other time periods are very low,the probability of occurrence and the number of CG lightning are slightly higher in the later stage of the control process than in the earlier stage;for 00 to 12 BT,the occurrence probability center of CG lightning was distributed in the southeast coast,the central value of probability is below 5%,the probability center of CG lightning is distributed in the north of inland from 12 to 21 BT,the probability center moves from the middle of Baisha to the east of Chengmai,the direction of movement is from southwest to northeast,the probability center reaches a maximum of 40%in the south of Chengmai;the occurrence probability of CG lightning in each period from July to September is higher than that in April to June,the peak number of CG lightning in July to September is fewer than that in April to June,the both of the spatial distribution of the probability center of CG lightning in each time period is completely consistent.
作者
劳小青
韦传波
周方聪
Lao Xiaoqing;Wei Chuanbo;Zhou Fangcong(Meteorological Disaster Prevention Technology Center of Hainan Province,Haikou 5702032 Qiongzhong County Meteorological Bureau of Hainan Province,Qiongzhong 5729263 Key Laboratory of South China Sea Meteorological Disaster Prevention and Mitigation of Hainan Province,Haikou 570203)
出处
《气象科技进展》
2021年第4期7-11,共5页
Advances in Meteorological Science and Technology
基金
海南省气象局科技创新项目(HNQXJS201807)
海南省自然科学基金项目(2017CXTD014)。
关键词
西南低压槽
地闪
特征
the southwest low-pressure trough
CG lightning
characteristics
