昼夜变化对FY-4A闪电成像仪探测性能的影响  

Effect of Day and Night Variation on Detection Performance of FY-4A Lightning Imager

作　　者：李静[1,2,3,4] 曾金全 邹斌[1,2,3,4] 孙豪 张其林[1,2,3,4] LI Jing;ZENG Jin-quan;ZOU Bin;SUN Hao;ZHANG Qi-lin(Key Laboratory of Meteorological Disaster, Ministry of Education, Nanjing University of Information Science and Technology, Nanjing 210044, China;Joint International Research Laboratory of Climate and Environment Change, Nanjing University of Information Science and Technology, Nanjing 210044, China;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disaster, Nanjing University of Information Science and Technology, Nanjing 210044, China;Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing 210044, China;Fujian Institute of Meteorological Sciences, Fuzhou 350001, China)

机构地区：[1]南京信息工程大学气象灾害教育部重点实验室,南京210044 [2]南京信息工程大学气候与环境变化国际合作联合实验室,南京210044 [3]南京信息工程大学气象灾害预报预警与评估协同创新中心,南京210044 [4]南京信息工程大学中国气象局气溶胶与云降水重点开放实验室,南京210044 [5]福建省气象科学研究所,福州350001

出　　处：《科学技术与工程》2022年第17期6828-6838,共11页Science Technology and Engineering

基　　金：河北省重点研发计划(19275409D)。

摘　　要：为了探究昼夜变化对卫星闪电成像仪探测性能的影响,利用低频磁天线闪电定位系统与FY-4A闪电成像仪(lightning mapping imager,LMI)的闪电探测数据匹配方法,分析了2020年9月于广东省及其周边地区发生的4次雷暴过程,并阐明昼夜变化因素对LMI探测性能的影响。研究发现:地基与星载闪电探测的空间分布特征、时间变化特征具有较好的一致性,但是地基探测的闪电数量更多,闪电分布更加密集。闪电匹配率与卫星探测率在日出后3~4 h突然下降,于日落前2 h左右突然增加,匹配率与探测率的突然增加与减少是由昼夜交替时LMI探测闪电数量的快速变化引起的。昼夜变化对LMI的探测性能产生显著影响,夜晚的探测效率大约是白天的10倍。即使雷暴活动增强,白天匹配率和探测率依然相对较低。In order to explore the influence of diurnal variation on the detection performance of satellite lightning imager,the lightning detection data of FY-4A lightning mapping imager(LMI)and the low-frequency magnetic antenna lightning location system were matched to analyze four thunderstorm processes that occurred in Guangdong Province and its surrounding areas in September,2020.The influence of diurnal variation factors on the detection performance of LMI was also explained.It is found that the spatial distribution and temporal variation characteristics of ground-based and space-borne lightning detection are in good agreement,but the number of lightning in ground-based detection is more and the lightning distribution is denser.The lightning coincidence percent and the satellite detection rate decrease suddenly 3~4 h after sunrise and increase suddenly about 2 h before sunset.The sudden increase and decrease of the lightning matching rate and the detection rate are caused by the rapid change in the number of lightning detected by LMI during the day-night alternation.The diurnal variation has a significant impact on the detection performance of LMI,and the detection efficiency at night is about 10 times that during the day.Even with increased thunderstorm activity,daytime coincidence percent and detection rates remained relatively low.

关 键 词：闪电成像仪(LMI) 低频磁天线 闪电探测 昼夜变化 数据匹配 

分 类 号：P427.3[天文地球—大气科学及气象学]