摘要
该文利用常规气象观测资料、多普勒天气雷达以及NCEP全球再分析资料和EC细网格数值预报资料,对2018年1月3—8日和24—28日出现在湖南岳阳的两次雨雪冰冻过程的强度、落区和相态转换进行对比分析。结果表明:①冷空气南下与中低层暖湿气流汇合于中东部一带,配合南支槽影响,是造成岳阳市两次雨雪冰冻天气的主要原因;②在这两次过程中降水(雪)时间段与垂直上升运动区对应较好,影响降水相态主要是垂直温度层结;③800~700 hPa中间出现>0℃的逆温层,以降雨或冻雨为主,而当整层温度低于0℃时,以降雪为主;④在两次过程中,EC细网格预报在过程降水的起止预报中都做的比较好,雨雪的转换时间及量级预报相对准确。
The intensity,location and phase transformation of two snow and rain freezing processes in Yueyang,Hunan province in January 2018 were compared and analyzed by using live observation data,dopler radar,NCP/fNL global reanalysis data and EC fine grid numerical forecast data.The results show that:①The cold air South merges with the middle and lower layers of warm and humid air in the central and Eastern areas,and with the influence of the southern branch trough,it is the main reason for the freezing weather of the two rains and snow in Yueyang City;②In these two processes,the precipitation(snow)period corresponds to the vertical upward movement area,and the influence on the precipitation phase is mainly the vertical temperature layer junction;③An inversion layer greater than 0℃appears in the middle of 800 hPa to 700 hPa,mainly rainfall or frozen rain,while when the entire layer temperature is lower than 0℃,snowfall is the main cause;④In the two processes,the EC fine grid prediction is relatively good in the starting and ending forecasting of process precipitation,and the conversion time and magnitude of rain and snow are relatively accurate.
作者
昌立伟
黄海波
李晶
余文会
CHANG Liwei;HUANG Haibo;LI Jing;YU Wenhui(Yueyang Meteorological Bureau,Yueyang 414001,China;Xiangtan Meteorological Bureau,Xiangtan 411100,China)
出处
《中低纬山地气象》
2020年第3期68-75,共8页
Mid-low Latitude Mountain Meteorology
关键词
冻雨
横槽转竖
暴雪
数值预报
frozen rain
vertical grooves
blizzard
numerical prediction
