2022年7月13日白城机场强降水诊断分析

Diagnosis and Analysis of Heavy Rainfall at Baicheng Airport on July 13, 2022

摘要: 本文利用ERA-5再分析资料，诊断分析了吉林省白城市2022年7月13日发生的强降水过程，结果表明：本次白城地区的强降水过程具有范围广、突发性强、持续时间较长的特征，并伴有频繁的雷电活动，为一次典型的对流性强降水过程；强降水发生之前白城地区水汽充沛、处于高能高湿的环境场中，有不稳定能量的蓄积；500 hPa、700 hPa的高空槽以及地面锋面系统为强降水的发生提供了动力抬升条件，同时白城地区附近中低层辐合、高层辐散的配置使得垂直上升运动增强并维持，垂直上升运动将低层的水汽源源不断地输送到对流层中高层，并触发不稳定能量的释放，诱发白城的强降水；且此次暴雨过程符合中尺度对流复合体(MCC)的特征。

Abstract: This paper uses ERA-5 reanalysis data to diagnose and analyze the heavy rainfall process in Baicheng City, Jilin Province on July 13, 2022. The results show that the heavy rainfall process in Baicheng area has the characteristics of wide range, strong burst, long duration, and frequent lightning activities, which is a typical convective heavy rainfall process; Before the heavy rainfall, Baicheng area had abundant water vapor, was in the environment field of high energy and high humidity, and had unstable energy accumulation; The 500 hPa and 700 hPa high troughs and the surface frontal system provide the dynamic lifting conditions for the occurrence of heavy rainfall. At the same time, the configuration of convergence at the middle and lower levels and divergence at the upper levels near Baicheng District enhances and maintains the vertical upward movement. The vertical upward movement continuously transports the water vapor source at the lower levels to the middle and upper troposphere, triggers the release of unstable energy, and induces the heavy rainfall in Baicheng; And the rainstorm process conforms to the characteristics of mesoscale convective complex (MCC).