弱环境风场下泉州地区极端短时强降水个例分析

Case Analysis of Extreme Short-term Heavy Rainfall in Quanzhou Area under Weak Environment Wind Field

利用自动气象站、NCEP再分析等相关观测资料,分析了泉州地区2018年5月7日的一次极端强降水天气成因。结果表明:此次极端强降水天气过程的天气系统包含高空槽、低空切变线,以及西南低空急流,中低层系统主要后倾型,有利于极端强降水天气的发生发展。福建沿海至福建中部一带还存在显著的风速辐合。泉州地区处于低空急流左前方、低层切变南侧,水汽辐合和垂直上升运动均非常强烈,为此次极端强降水天气的发生提供了有利条件。

Based on automatic weather stations and NCEP reanalysis data, this paper analyzed the cause of an extremely heavy precipitation event in Quanzhou on May 7,2018. The results showed that the weather system of the extreme heavy precipitation process consists of upper trough, low level shear line and southwest low level jet, and the middle and low level system was mainly backward inclined, which was conducive to the occurrence and development of the extreme heavy precipitation weather. There was also significant wind convergence from the coast of Fujian to the central part of Fujian province. Quanzhou area was located in the left front of low-level jet and the south side of low-level shear. Water vapor convergence and vertical upward movement were very strong, which provides favorable conditions for the occurrence of extreme heavy rainfall.