Application research of wind profile radar in short-term heavy rainfall forecast of typhoon in Fujian Province  

作　　者：Zeng Jinyu Lian Chenfang Yin Siyu Sun Chaofeng 

机构地区：[1]Fujian Provincial Meteorological Observatory,Fuzhou,China [2]Fujian Provincial Key Laboratory of Disaster Weather,Fuzhou,China [3]Longyan Meteorological Bureau of Fujian,Longyan,China [4]Fujian Provincial Meteorological Service Center,Fuzhou,China

出　　处：《Tropical Cyclone Research and Review》2024年第4期261-275,共15页热带气旋研究与评论(英文版)

基　　金：funded by the Fujian Provincial Meteorological Bureau Open Research Fund Project(2020K05);Fujian Provincial Meteorological Bureau Open Research Fund Project(2021K01).

摘　　要：Based on wind profile radar data,this paper aims at different typhoon processes landed and affected Fujian from 2011 to 2019,according to the nature of typhoon rainstorm,it can be classified into outer precipitation before typhoon landed,main body precipitation and precipitation at the rear of typhoon,the change of the characteristic quantities in approaching time of the occurrence of short-term heavy rainfall was analyzed,and the typhoon case in 2020 was back calculated.The results show that,the characteristics of low-level jet streams(maximum wind speed at low altitude,minimum height of jet streams,and low-level jet stream index),as well as the magnitude of vertical wind shear below 700 hPa,have important indicative significance for the occurrence of short-term heavy rainfall.(1)More than 80%of short-term heavy rainfall occurred 3 h before the low-level jet stream already existed.The maximum wind speed below 2 km was basically close to a normal distribution,and the occurrence of heavy precipitation showed a bimodal pattern.The percentage of wind speed between 8 and 32 m/s was the highest,exceeding 85%.The wind direction of the strong wind is mainly NE,SE,and SW.Classification analysis showed that the distribution characteristics of wind speed of the main precipitation were the same as before,but the wind direction SE was higher than NE.The wind speed of pre-landfall precipitation was basically skewed,and the occurrence time of heavy precipitation followed a normal distribution.The percentage of wind speed between 16 and 32 m/s was the highest,and the wind direction was the same as before classification.The maximum wind speed of precipitation in the rear was basically bimodal distribution,with a relatively even distribution,and the wind direction was mainly SE and SW.(2)In the 3 h before the occurrence of short-term heavy precipitation,there was an increase in the maximum wind speed value,a decrease in the minimum extension height,and an increase in the low-level jet stream index I.As short-term heavy rainfall a

关 键 词：Wind profile radar Short-term heavy rainfall LLJ Vertical wind shear Threshold value 

分 类 号：P44[天文地球—大气科学及气象学]