滇中及以东地区一次强降雪天气过程诊断分析  

Diagnosis Analysis of a Heavy Snowfall Weather Process in Central and Eastern of Yunnan Province

作　　者：段雪梅 王凤莲 白波 Duan Xuemei;Wang Fenglian;Bai Bo(Qujing Meteorological Bureau of Yunnan Province,Qujing 655000,Yunnan,China;Luliang Meteorological Bureau in Qujing of Yunnan Province,Luliang 655600,Yunnan,China)

机构地区：[1]云南省曲靖市气象局,云南曲靖655000 [2]曲靖市陆良县气象局,云南陆良655600

出　　处：《山地农业生物学报》2024年第3期76-84,共9页Journal of Mountain Agriculture and Biology

摘　　要：2022年2月19至23日,滇中及以东地区出现强降温降雪天气,其中曲靖出现了中到大雪局部暴雪或大暴雪。利用常规观测资料、物理量场、卫星云图等数据对此次天气过程进行诊断分析。结果表明:南支槽与昆明准静止锋(冷锋)是此次强降雪天气的主要影响系统;西南气流加强、水汽通量加大以及低层水汽辐合、高层辐散为此次降雪天气过程提供了较好的水汽条件;强烈的上升运动为降雪提供了必要的动力扰动;700 hPa上-4℃等温线和地温低于0℃的温度线与雪线位置相对应;卫星云图清晰的反映了南支槽与昆明准静止锋(冷锋)的移动、交汇和发展;多普勒雷达图上也进一步证实了不断补充加强的冷空气在此次降雪过程中的重要性。此次分析从天气系统、物理量场、卫星云图和雷达回波等各个维度进行,得出了滇中及以东地区出现降雪天气的指标,对以后降雪天气的预报具有明确的指示作用。A heavy cooling and snowfall weather in central and eastern Yunnan were occured from February 19 to 23,2022,in which Qujing had moderate to heavy snow,with local heavy snow or blizzard.In the paper,this heavy snow weather process was diagnosed and analyzed based on conventional observation data,physical quantity field,satellite cloud image and other data.The results showed that the south branch trough and the Kunming quasi-stationary Front/cold front were the main systems that caused the snowfall.The strengthening of southwest air flow,the increase of water vapor flux,the convergence of water vapor at the lower level and the divergence of water vapor at the upper level have provided better water vapor conditions for this snowfall process.And strong ascending motion provided necessary dynamic disturbance for the snowfall.The isotherm of-4℃at 700 hPa and the temperature line of ground temperature less than 0℃correspond to the location of the snow line.The satellite cloud image could clearly reflected the movement,convergence and development of the south branch trough and Kunming quasi-stationary front/cold font.The importance of continuously replenishing and strengthening cold air in the snowfall process were further confirmed based on the radar map.The analysis was carried out from various dimensions such as weather system,physical quantity field,satellite cloud image,radar echo,and obtained the index of snowfall weather in central and eastern Yunnan,which plays a clear indicating role in the future snowfall weather forecast.

关 键 词：强降雪 南支槽 昆明准静止锋 卫星云图 多普勒雷达 

分 类 号：P44[天文地球—大气科学及气象学]