一次雨雪天气过程成因分析  

Analysis of the Cause of a Rain and Snow Weather Process

作　　者：李琛 董疆南 马鸿青[1] LI Chen(Baoding Meteorological Observatory,Baoding,Hebei 071000)

机构地区：[1]保定市气象局,河北保定071000

出　　处：《农业灾害研究》2022年第8期16-18,22,共4页Journal of Agricultural Catastrophology

摘　　要：利用常规气象观测资料、NCEP 1°×1°再分析资料以及欧洲中心ERA5资料,对2021年11月6—7日保定市一次雨雪天气过程进行分析,探讨此次雨雪过程的成因,结果表明:本次过程是高空槽、700 hPa低槽和低空急流、低层低涡切变线,以及地面冷锋的共同影响造成的;降水后期转为回流形势的影响,暖湿空气在冷垫上爬升,造成大范围的雨雪天气;850hPa有暖舌存在,使得中部地区降温时间晚,转雪时间相对较慢;良好的水汽条件和动力条件,有利于此次雨雪过程的发生。Based on the conventional meteorological observation data, NCEP 1°×1° reanalysis data and ERA5 data of European Center, a rain and snow weather process in Baoding on November 6-7, 2021was analyzed, and the causes of the rain and snow process were discussed. The results showed that the process was caused by the combined influence of the high-altitude trough, 700 hPa trough and low-level jet stream, low-level vortex shear line and the ground cold front. In addition, due to the influence of the reflux situation in the later stage of precipitation, warm and humid air climbed on the cold mat, resulting in a wide range of rain and snow weather. There was a warm tongue at 850 hPa, which made the cooling time in the central region late and the snow turning time relatively slow. Good water vapor conditions and dynamic conditions were conducive to the occurrence of this rain and snow process.

关 键 词：雨雪转换 降水相态 回流 温度平流 

分 类 号：P458.121[天文地球—大气科学及气象学]