Abstract In this paper the match percentage (MP) of lightning frequency in Jiangsu, China from June to August in 2019 is analyzed, by comparing the lightning mapping imager (LMI) data from FengYun (FY)-4A geostationary meteorological satellite with the Advanced Direction and Time-of-arrival Detecting (ADTD)-2 total lightning location data and radar composite reflectivity. The results show that the MP increases with the spatial matching window, yet when the matching window is larger than 0.8° (~80 km), the MP tends to be stable. Furthermore, the spatial distribution of lightning and the characteristics of the match lightning (ML) current are analyzed. The horizontal detection error of LMI for isolated thunderstorm clusters is about 0.15 ± 0.003° (~15 km). The amplitude of the lightning current is an important but not the only factor affecting the satellite's detection efficiency. Through the 10 min analysis of a large-scale and long-term thunderstorm process in Jiangsu province on July 6, 2019, it is found that the lightning detected by LMI and ADTD-2 occurred mostly in the region with strong echoes above 40 dBZ or in its vicinity. With the development of the thunderstorm, the lightning detected by ADTD-2 gradually increased and reached a maximum at 14:40. Subsequently, with the weakening of the thunderstorm system the lightning detected by ADTD-2 gradually decreased. However, the lightning detected by LMI was less all the time before 18:30 and then increased gradually. In the fourth stage (19:40 on July 6–00:20 on July 7), LMI has the highest relative detection efficiency of 12.78%–14.66% using ADTD-2 as a reference, indicating that the satellite detection is relatively less efficient during the daytime.

中文翻译：

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FY-4A LMI闪电探测数据与ADTD-2对比验证

摘要 本文通过风云（FY）-4A地球静止气象卫星闪电测绘成像仪（LMI）数据与先进方向（Advanced Direction）的数据对比，分析了2019年6-8月江苏省闪电频率的匹配率（MP）。到达时间探测 (ADTD)-2 总闪电位置数据和雷达复合反射率。结果表明，MP随着空间匹配窗口的增加而增加，但当匹配窗口大于0.8°（~80 km）时，MP趋于稳定。此外，还分析了闪电的空间分布和匹配闪电（ML）电流的特性。孤立雷暴群的 LMI 水平检测误差约为 0.15 ± 0.003°（~15 公里）。雷电流的幅值是影响卫星探测效率的一个重要但不是唯一的因素。通过对2019年7月6日江苏省一次大范围长期雷暴过程的10分钟分析发现，LMI和ADTD-2探测到的闪电主要发生在40dBZ以上强回波或在其附近。随着雷暴的发展，ADTD-2探测到的闪电逐渐增多，并在14时40分达到最大值。随后，随着雷暴系统减弱，ADTD-2探测到的闪电逐渐减弱。但LMI探测到的闪电在18:30之前一直较少，然后逐渐增加。第四阶段（7月6日19:40-7月7日00:20），LMI相对检测效率最高，为12.78%-14。