基于双偏振雷达的一次冷空气大风过程研究  

Research on a Cold Air Strong Wind Process Based on Dual Polarization Radar

作　　者：龙妍妍[1] 张雯 LONG Yanyan;ZHANG Wen(Civil Aviation Flight University of China,Guanghan 618307,Sichuan,China;Civil Aviation Flight University of China Mianyang Flight College,Mianyang 621000,Sichuan,China)

机构地区：[1]中国民用航空飞行学院,四川广汉618307 [2]中国民用航空飞行学院绵阳分院,四川绵阳621000

出　　处：《民航学报》2024年第6期83-86,共4页Journal of Civil Aviation

基　　金：国家自然科学基金项目(42105087);中央高校基本科研业务费基金项目(ZJ2021-02);中央高校基本科研业务费基金项目(2023126);中央高校基本科研业务费基金项目(J2022-103);民航局安全能力项目(14002600100020J009);民航局安全能力项目(20200046)。

摘　　要：利用常规气象观测资料和双偏振天气雷达资料,对2022年11月11日绵阳机场一次冷空气大风天气过程进行分析,结果表明:1)这次冷空气大风天气过程,是在我国中部高层为一槽,低层四川盆地为热低压,地面图上蒙古高压形成,形成了北高南低的形势的环流背景下形成的。强冷空气堆积产生强气压梯度风,地面迅速加压产生强变压风,冷空气下沉动量下传,是产生大风的主要原因。2)双偏振天气雷达可以精准探测到大风向下传递的时空演变特征,可提前30 min对大风做出精准预报;根据高空强风核及速度模糊区出现时间,可提前1h做出大风预警。3)通过对绵阳机场模糊区速度进行±2V_(max)的操作,可获得纠正后的速度值。Using conventional meteorological observation data and dual polarization weather radar data,this paper analyzes a cold air strong wind process at the Mianyang Airport on November 11,2022.The results show that:1)This cold air strong wind process was formed under the circulation background of a trough in the upper layer of central China,a thermal depression in the lower layer of the Sichuan Basin and the formation of the Mongolian high pressure on the ground map forming a situation of high in the north and low in the south.The main causes of the strong winds were that the accumulation of strong cold air generated strong pressure gradient winds,the rapid pressure increase on the ground generated strong variable pressure winds,and the sinking momentum of cold air was transmitted downwards.2)Dual polarization weather radar can accurately detect the spatiotemporal evolution characteristics of downward propagation of strong winds,and can make accurate predictions of strong winds 30 minutes in advance;based on the occurrence time of high altitude strong wind cores and speed blurry areas,a strong wind warning can be issued one hour in advance.3)By performing±2V_(max)operation on the speed in the max fuzzy area of the Mianyang Airport,the corrected speed value can be obtained.

关 键 词：冷空气大风 双偏振雷达 退模糊修正 回波特征 预报 

分 类 号：P458[天文地球—大气科学及气象学]