| 摘要: |
| 为开展星载闪电活动特征分析，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。结果表明：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时至次日05时，空间上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，空间上整体呈现西部高于东部、北部高于南部；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。 |
| 关键词: FY-4A闪电成像仪; 闪电活动; 辐亮度 |
| DOI： |
| 投稿时间：2023-12-19修订日期：2024-05-18 |
| 基金项目:贵州省科学技术基金项目 (黔科合基础-ZK[2022]一般245)，贵州省科技厅计划支撑（黔科合支撑[2021]一般510） |
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| Analysis of Lightning Activity Characteristics in Guizhou and Surrounding Regions Based on FY-4A LMI |
| wuankun |
| (Guizhou Meteorological Disaster Prevention Technology Center,) |
| Abstract: |
| To conduct analysis on the characteristics of spaceborne lightning activity, data from the FY-4A lightning imaging instrument were used, taking Guizhou Province and its surrounding areas as an example, to analyze the distribution characteristics of lightning frequency and radiance. 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 space from 19:00 to 05:00 the next day. Overall, the southern part is higher than 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 space, the overall trend is higher in the west than in the east and higher in the north than in the 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 "events" to "groups" is between 3-4, which is consistent with a return stroke or K-process at the spatial scale. |
| Key words: FY-4A lightning imager; Lightning activity; Radiance |
