| 摘要: |
| 利用FY-4A卫星闪电成像仪LMI、TBB、地基闪电ADTD数据和NCEP-FNL再分析资料等，以2022 年5月10日广东一次暴雨过程为例，对两个不同强降水区域对流云团发展演变的观测特征进行了分析。结果表明：中北部清远至九连山南侧的强降水1区属于典型的锋面低槽型暴雨，发生在低槽前部冷暖交汇区，珠江口西侧沿海附近的强降水2区则是暖区西南和偏南气流辐合作用的结果。此个例强降水发生前TBB迅速下降，强降水主要位于对流云团TBB低值中心梯度大值区。对流发展初期TBB逐渐下降到230 K以下，TBB变率较前1 h下降幅度可达-15 ℃以上，局部可达-30 ℃，对流云团移动前方的闪电对下一时刻对流的发展移动有很好的指示意义，锋面降水中ADTD较LMI提前出现；成熟阶段TBB大范围下降到220 K以下，局部200 K以下，TBB变率减小，维持在0~-10 ℃，闪电达到峰值，密集闪电随着TBB≤220 K低值区移动。 |
| 关键词: FY−4A 卫星 LMI 强降水 云顶亮温变率 |
| DOI：10.16032/j.issn.1004-4965.2023.029 |
| 分类号: |
| 基金项目: |
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| A FY-4A OBSERVATIONS AND LIGHTNING CHARACTERISTICS OF A HEAVY PRECIPITATION IN GUANGDONG 2022 |
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CAI Zhanwen1, WANG Tong1,2, ZHU Chuanlin3, LEI Yansen4, GOU Aning4
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1. Climate Center of Guangdong Province, Guangzhou 510641， China;2. College of Atmospheric Sciences,Chengdu University of Information Technology, Chengdu 610225, China;3. Hubei Provincial Lightning Protection Center, Wuhan 430074, China;4. Wuhan Central Meteorological Observatory, Wuhan 430074, China
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| Abstract: |
| Based on the LMI, TBB and ground-based lightning ADTD data of FY-4A satellite lightning imager and NCEP-FNL reanalysis data, a rainstorm process in Guangdong on May 10, 2022 was taken as an example to analyze the observation characteristics of the development and evolution of convective cloud clusters in two different heavy precipitation regions. The results show that the heavy precipitation zone 1 from Qingyuan to the south of Jiulian Mountain in the central and northern part of China is a typical frontal low trough type rainstorm, which occurs in the convergence area of cold and warm in front of the low trough. The heavy precipitation zone 2 near the southeast coast is the result of the cooperation of southwest and south airflow in the warm zone. In this case, TBB decreased rapidly before the occurrence of heavy precipitation, and the heavy precipitation was mainly located in the large gradient area of convective cloud TBB low value center. In the early stage of convective development, TBB gradually decreased to less than 230 K, and the variation of TBB decreased to more than -15 ℃ and -30 ℃ in some areas compared with the previous 1 h. Lightning in front of convective cloud movement was a good indicator of the development and movement of convection at the next time, and ADTD appeared earlier than LMI in frontal precipitation. In the mature stage, TBB drops to below 220 K in a large range, and below 200 K in some areas, the TBB variability decreases and remains at 0~-10 ℃, and ADTD appeared earlier than LMI in frontal precipitation. In the mature stage, the TBB decreases to below 220 K in a large range and 200 K in some areas. The TBB variability decreases and maintains at 0~-10 ℃, and lightning reaches its peak. Intensive lightning moves with the low value area of TBB≤220 K. |
| Key words: FY-4A satellite Lightning mapping imager Heavy precipitation Cloud top brightness temperature variation |
