The simulation result is scale-separated by spatial band-pass filtering, which reveals the mesoscale low pressure and convergence line that had direct impact on this rainfall process.

• 采用空间带通滤波技术，对模拟结果进行尺度分离，揭示出对此次暴雨天气过程有直接影响的中尺度系统，即中尺度低压和中尺度辐合线；