基于FY-4A LMI的贵州及周边区域闪电活动特征分析  

Analysis of Lightning Characteristics in Guizhou and Surrounding Regions Based on FY-4A LMI

作　　者：吴安坤 郭军成 王强 WU Ankun;GUO Juncheng;WANG Qiang(Guizhou Meteorological Data Center,Guiyang 550081,China;Anshun Meteorological Office of Guizhou Province,Anshun 561000,China)

机构地区：[1]贵州省气象数据中心,贵州贵阳550081 [2]贵州省安顺市气象局,贵州安顺561000

出　　处：《山地气象学报》2024年第4期49-55,共7页Journal of Mountain Meteorology

基　　金：贵州省科学技术基金项目(黔科合基础-ZK[2022]一般245);贵州省科技计划支撑项目(黔科合支撑[2021]一般510)。

摘　　要：【目的】为开展星载闪电活动特征分析。【方法】采用FY-4A闪电成像仪资料,以贵州省及其周边区域为例,分析闪电频次分布及辐亮度分布特征。【结果】研究区域闪电频次集中分布在一年的中的4—8月,一天中的19时—次日05时,空间分布呈现显著的地域性差异,整体南部高于北部;辐亮度日变化呈现与频次相反的单峰型变化,白天高于夜间,空间分布整体呈现西部高于东部、北部高于南部的特征;LMI闪电辐亮度值与雷电流强度密切相关,聚类后的LMI“组”数据一致性较好,“事件”与“组”频数比介于3~4之间,在空间尺度上与一次闪击或者K过程相符。【结论】研究结果为今后在业务中使用该资料提供参考。In order to explore the characteristics of spaceborne lightning activity,this paper analyzes the distribution characteristics of lightning frequency and radiance by using the data from the FY-4A lightning imager and taking Guizhou Province and its surrounding areas as the study area.The results show that the lightning frequency in the study area is concentrated from April to August of the year,and there is a significant regional difference in spatial distribution from 19∶00 to 05∶00 the next day.Overall,lightning in the southern part occurs more frequently than in the northern part.The diurnal variation of radiance shows a unimodal pattern opposite to its frequency,with higher values during the day than at night.In terms of spatial distribution,the overall trend of lightning frequency is higher in the west and north than in the east and south.The lightning radiance value of LMI is closely related to the lightning current intensity.The clustered LMI "group" data has good consistency,and the frequency ratio of "event" to "group" is between 3 and 4,which is consistent with a flash or K-process at the spatial scale.The research results provide reference for the future use of this information in business.

关 键 词：FY-4A闪电成像仪 闪电活动 辐亮度 

分 类 号：P427.3[天文地球—大气科学及气象学]