2014年宁夏石嘴山市一次久旱转连阴雪天气分析  

Analysis of a long drought turn to continued cloudy-snowy weather process in Shizuishan in 2014

作　　者：周翠芳 方宁莲 杨婧 孙卫武 田风 

机构地区：[1]宁夏石嘴山市气象局,宁夏石嘴山753000

出　　处：《宁夏工程技术》2015年第3期215-222,共8页Ningxia Engineering Technology

摘　　要：利用常规观测资料、自动气象站资料、雷达资料及NCEP再分析资料,对2014-02-04—07宁夏石嘴山市一次久旱转连阴雪天气过程从天气学、物理量场、雷达资料等几个方面进行了分析.结果表明,此次连阴雪天气是在有利的环流背景下,巴尔喀什湖扩散冷空气配合高原东部偏南暖湿气流及华北高压后部东南气流共同形成的;探空资料显示,低层的逆温层及不稳定层结,高、低层24 h变温对降雪开始时间有一定的指示意义;主要降雪时段的物理量特性与暴雪等强降雪有所不同;从雷达反射率因子及基本速度来看,雷达反射率因子强度的不同及地面辐合线的存在是较强降雪出现的主要原因.By using conventional observation data, the automatic meteorological station data, radar data and NCEP reanalysis data, a long drought turned to continued cloudy-snowy weather were analyzed in aspects of synoptic meteorology, physical field, radar data in Shizuishan, Ningxia, February 4 to 7, 2014. The results showed that the continued cloudy-snow weather was together from cold air spreading at Balkhash Lake, coordinating with warm moist air flows at south of eastern plateau, and back of high pressure flows at north China, under the background of favorable circulation. Sounding data at low-level inversion layer and unstable layer and 24 hou~ variable temperature data at high to low layer had certain instruction significance to snow beginning time. Physical characteristics were different to blizzard during main snow time. From the point of radar reflectivity factor and basic speed, difference of radar reflectivity factor intensity and the existence of surface convergence line were the main cause of strong snowfall occurrence.

关 键 词：连阴雪 降水 天气分析 石嘴山市 

分 类 号：P458[天文地球—大气科学及气象学]