珠江三角洲地区一次局地极端强降雨的大气环流条件及其可预警性分析
Atmospheric Circulation Conditions and Early Warning Capability of a Local Extremely Heavy Rainfall in Pearl River Delta
中文摘要：
应用常规气象观测资料、多普勒天气雷达产品，结合ERA5（0.25°×0.25°）再分析资料，对2021年8月1日17：00—19：00发生在广东省佛山市南海区的局地短时暴雨进行分析，结果表明：短时暴雨发生的环流背景是前倾槽配合850 hPa的切变线；中层强的上升运动和低层源源不断的水汽输送为本次过程提供了有利的动力条件和水汽条件；地面长时间存在的气旋性涡旋和辐合区可能是造成此次强降雨的重要原因之一。本文还对此次极端强降雨的气象服务工作进行分析，总结了工作经验，为今后重大气象服务提供参考。
中文关键词：
极端强降雨，垂直累积液态含水量（VIL），暴雨预警信号，多普勒雷达特征
KeyWords：
extremely heavy rainfall, VIL, warning signals for heavy rainfall, Doppler radar echo
Abstract：
Using conventional meteorological observation data, the products of Doppler weather radar and the 0.25°×0.25° ERA5 reanalysis data, this study analyzes a local short-time heavy rainfall in Nanhai District, Foshan City, Guangdong Province from 17：00 BT to 19：00 BT on 1 August 2021. The results show that the circulation background of the short-time rainstorm is a forward trough with an 850 hPa shear line. The strong mid-level upward motions and the persistent low-level water vapor transport provide favorable dynamic and water vapor conditions for this extremely heavy rainfall. The long-duration existence of the cyclonic vortexes and convergence on the ground may be one of the important reasons leading to the occurrence of this extremely heavy rainfall. This paper also analyzes the meteorological service for the extremely heavy rainfall and summarizes the work experiences, which can provide reference for meteorological services in the future.