Abstract: Based on the groundbased 3D lightning detection network (3D LDN) data in Dalian and Qingdao areas, the detection efficiency of FY-4A lightning mapping imager (LMI) in the Yellow sea and Bohai sea area was evaluated. It was found that from the four severe convective weather processes in Dalian area in 2019, most of the lightning pulses occurred within radar echoes intensity greater than 30 dBZ, and the corresponding cloud top height was about 9 km, the number of groups detected by FY4A LMI was fewer than that of the pulses presented by groundbased 3D LDN, the average ratio was 0.2, ranging from 0.15 to 0.26. From the five severe convective weather processes in Qingdao area in 2019, the number of groups detected by FY4A LMI was also fewer than that of the pulses presented by groundbased 3D LDN, the average ratio was 0.34, ranging from 0.27 to 0.4. Generally, the lightning pulses location detected by FY-4A LMI was consistent with the lightning pulses presented by groundbased 3D LDN in Qingdao area, which located in strong echo area. However, the detection efficiency of FY4A LMI in the Yellow Sea and Bohai Sea area was lower.

Key words: FY-4A LMI, lightning stroke, group, detection efficiency

摘要： 基于大连和青岛地区地基三维雷电探测网数据，对FY4A闪电成像仪（lightning mapping imager, LMI）在黄渤海地区的探测效率进行评估。结果表明：针对2019年大连地区4次强对流天气过程，绝大多数地基三维雷电探测网探测的雷电脉冲发生在强回波区，回波强度为30 dBZ，强回波区的云顶高度超过9 km， FY-4A LMI探测到的组（group）数量与地基三维雷电探测网探测的雷电脉冲数量之比平均值为0.2，变化范围为0.15～0.26；针对2019年青岛地区5次强对流天气过程，FY4A LMI探测的group数量较少，其与地基三维雷电探测网探测的雷电脉冲数量比值的平均值为0.34，变化范围为0.27～0.4，地基三维雷电探测网和FY4A LMI测到的雷电活动的空间位置比较一致，都基本处于强对流核心区域。总体来看， FY-4A LMI在黄渤海地区的探测效率比较低下。

关键词: FY-4A闪电成像仪, 闪击stroke, 组group, 探测效率