一次雨转雪天气过程形势及物理量诊断分析  

Diagnosis and Analysis of Situation and Physical Quantity of a Weather Process From Rain to Snow

作　　者：刘翔 LIU Xiang(Meteorological Bureau ofGaogang District,Taizhou,Jiangsu 225400)

机构地区：[1]泰州市高港区气象局,江苏泰州225400

出　　处：《农业灾害研究》2021年第3期75-77,83,共4页Journal of Agricultural Catastrophology

摘　　要：利用常规观测资料、micaps资料以及NCEP/NCAR再分析资料,对2020年12月29日一次寒潮天气下的雨转雪过程进行诊断分析。结果表明:本次降雪过程是500 hPa横槽转竖引导冷空气南下,700 hPa和850 hPa切变,配合700 hPa西南暖湿急流共同作用引起的;降雨时,低层有强上升运动区,对应水汽辐合,当出现降雪后,强上升运动区移至700 hPa~400 hPa附近,中高层也转为水汽辐合层。This article uses conventional observation data,micaps data and NCEP/NCAR reanalysis data to diagnose and analyze the process of changing from rain to snow under a cold wave on December 29,2020.The results show that this snowfall process is caused by the 500 hPa horizontal trough turning vertical to guide the cold air southward,700 hPa and 850 hPa shear,combined with the 700 hPa southwest warm and humid jet;When it rains,there is a strong upward movement area in the lower layer,corresponding to the convergence of water vapor.When snowfall occurs,the strong ascending movement area moves to around 700 hPa to 400 hPa,and the middle and high-rise buildings also turn into water vapor convergence layers.

关 键 词：横槽 上升 水汽辐合 

分 类 号：P458.2[天文地球—大气科学及气象学]