摘要
为了揭示强降雪天气的成因,以期为此类农业灾害性天气的预报预警提供指示,应用常规观测资料、NECP再分析资料,对2015年11月23—24日一次强降雪天气的天气形势、物理量条件进行分析。结果表明:西风槽、低空急流和地面冷高压是此次强降雪天气的主要影响系统,此次降雪符合回流降雪特征;水汽条件上边界层以上的暖湿空气沿着冷空气层爬升产生降雪,为此次过程的主要特点,边界层比湿南大北小是此次降雪量级聊城北部中雪南部大雪的主要原因;降雪时925 h Pa以上强上升气流、暖平流,近地面边界层内弱下沉气流、冷平流。
The paper aims to reveal the causes of heavy snow weather, and provide reference for forecasting and early warning of agricultural disastrous weather. Based on conventional observation data and NCEPreanalysis data, the authors diagnosed and analyzed synoptic situation and physical conditions of a heavy snow process from November 23 to 24, 2015 in northwestern Shandong. The results showed that： the main effectsystem of the heavy snow included the westerly trough, the low-level jet and the cold high pressure on ground,and the heavy snow had characteristics of the backflow of snow; the main feature was warm moist air aboveboundary layer climbing along the cold air layer; the main reason for the snowfall distribution was that specifichumidity under the boundary layer in the south was more than that in the north; during the heavy snow process,there were strong updraft and warm advection above 925 h Pa, and weak downdraft and cold advection in boundary layer.
出处
《中国农学通报》
2016年第23期148-152,共5页
Chinese Agricultural Science Bulletin
基金
山东省气象局局面上课题"鲁西北雨雪相态转换机制和预报方法研究"(2012sdqx03)
关键词
强降雪
低温冻害
回流形势
低空急流
温度平流
heavy snow
low temperature freezing-disaster
backflow situation
low level jet
temperature advection
