一次伴随阵风锋的强对流过程雷达回波分析  

Analysis of Radar Echoes of a Strong Convection Process Accompanied by a Gust Front

作　　者：梁明增[1] 杨杰[1] LIANG Mingzeng;YANG Jie(Civil Aviation Flight University of China,Guanghan 618307,Sichuan,China)

机构地区：[1]中国民用航空飞行学院,四川广汉618307

出　　处：《民航学报》2024年第3期112-116,共5页Journal of Civil Aviation

摘　　要：本文利用常规天气资料、多普勒天气雷达资料、探空和自动站资料,对2023年7月17日广汉机场附近发生的一次伴随阵风锋的强对流天气过程进行分析,表明:阵风锋过境时,温度下降,风向会突然转向,风速发生猛增;K指数、沙氏指数、T850-T500和T7000-T500对预报雷暴大风有一定的指示意义;当雷暴中的强回波区快速降低高度时,形成强烈的下沉气流,生成阵风锋;由于阵风锋的高度低,在雷达上,在低仰角的反射率因子图上最先可以监测到弧形弱回波带;阵风锋移动过程中容易触发新雷暴的生成。Using conventional weather data,Doppler weather radar data,sounding and automatic station data,this paper analyzes a strong convective weather process accompanied by a gust front near Guanghan Airport on July 17,2023.The results show that when the gust front passes through,the temperature drops,the wind direction suddenly changes,and the wind speed increases sharply;the K index,Shackleberry index,Tso-Tsoo and Tooo-Tsoo have certain indicative significance for predicting thunderstorms and strong winds;when the strong echo area in a thunderstorm rapidly decreases in height,a strong downdraft is formed,generating gust fronts;due to the low height of the gust front,the arc-shaped weak echo zone can be detected first on the reflectivity factor map at low elevations on radar;the generation of new thunderstorms is easily triggered during the movement of gust fronts.

关 键 词：阵风锋 风切变 

分 类 号：V321.225[航空宇航科学与技术—人机与环境工程]