宁夏一次大风沙尘天气过程分析  

Analysis of a Strong Wind and Dust Weather Process in Ningxia

作　　者：马霞 庞彩霞 于冬梅 MA Xia;PANG Caixia;YU Dongmei(Key Laboratory for Meteorological Disaster Monitoring and Early Warning and Risk Management of Characteristic Agriculture in Arid Regions,CMA,Yinchuan 750002,China;Jingyuan Meteorological Bureau,Jingyuan 756400,China;Jingxi Meteorological Bureau,Baise 533899,China)

机构地区：[1]中国气象局旱区特色农业气象灾害监测预警与风险管理重点实验室,宁夏银川750002 [2]泾源县气象局,宁夏固原756400 [3]靖西市气象局,广西百色533899

出　　处：《宁夏工程技术》2019年第4期289-294,共6页Ningxia Engineering Technology

摘　　要：利用常规气象资料以及FNL 6 h再分析资料,对2014年4月24日宁夏地区的一次大风、沙尘天气过程,从天气学成因、动力机制、热力场特征等方面进行了诊断分析。结果表明,此次大风沙尘天气过程是在高空强风带和强锋区,地面冷高压、热低压以及两者过渡地带产生的地面强冷锋共同作用下发生的,200 hPa高空急流也是影响此次大风沙尘天气的重要因素之一。通过对动力热力场及垂直风结构分析得出,强热力不稳定与上升气流有利于沙尘的卷起,同时垂直风的切变也有利于对流的发生。Using the data of basic observation and FNL reanalysis 6 h,the synoptic causes and forcing mechanism of a gale and dust weather process were analyzed on April 24th,2014 in Ningxia.The results show that the occurrence of the gale and dust weather process is under the interaction of the generated strong ground cold front in high-altitude winds,strong frontal zone,surface cold high pressure,hot low pressure and the transition between these two areas.The 200 hPa high-altitude jet is also one of the important factors affecting the high-altitude sandstorm weather.Through the analysis of thermal power field and vertical wind structure,it is concluded that the strong thermodynamic instability and upward current are conducive to the dust rolling up,and wind shear is also conducive to strengthen the instability.

关 键 词：大风沙尘 地面强冷锋 高空急流 热力不稳定 

分 类 号：P458[天文地球—大气科学及气象学]