多普勒雷达产品在暴雪天气过程中的应用  

Application of Doppler Radar Products in Blizzard Weather

作　　者：孙菀 SUN Yu(Zhumadian Meteorological Bureau,Zhumadian,Henan 463000)

机构地区：[1]驻马店市气象局,河南驻马店463000

出　　处：《农业灾害研究》2020年第2期73-75,共3页Journal of Agricultural Catastrophology

摘　　要：利用常规观测资料、新一代多普勒雷达产品结合天气形势和实况对2017年2月21日发生在河南省驻马店地区的一次分别伴有强降雪和雷暴的暴雪天气过程和数据进行了详细分析。观测结果表明,此次连续降雪过程主要是因为受高空槽的东移运动影响,中低层暖湿空气和急流的连续快速输送和维持为此次过程提供了充沛的水汽,强风速急流带造成的上升运动引起强降雨和雷暴的连续发生;暴雪强风速反射率辐合因子造成的回波运动强度一直维持在40 dBZ以上,回波顶高在9 km以上;速度场上零速度线呈“S”形结构,风向随高度顺转,有暖平流存在;中低层“牛眼”结构是暴雪的显著特征;风廓线场上,中低层有明显的西南风急流和风垂直切变。Based on the conventional observation data,the new generation Doppler radar products and the weather situation and the actual situation,the snowstorm process and data with strong snow and thunderstorm in Zhumadian area of Henan Province on February 21,2017 were analyzed in detail.The results showed that the continuous snowfall process was mainly affected by the eastward movement of the high trough,and the continuous and rapid transportation and maintenance of the warm and humid air and jet in the middle and lower layers provided abundant water vapor for the process.The ascending movement caused by the strong wind speed jet belt caused the continuous occurrence of heavy rainfall and thunderstorm.The echo motion intensity caused by the strong wind speed reflectivity convergence factor of the blizzard had been maintained at above 40 dBZ,the echo top height was above 9 km.The zero velocity line in the velocity field was of"S"structure,the wind direction changed with the height,and there was warm advection.The"bull’s eye"structure in the middle and lower layers was the significant feature of blizzard.In the wind profile field,there were obvious southwest jet and vertical wind shear in the middle and lower layers.

关 键 词：暴雪 基本反射率因子 相对径相速度 风廓线 

分 类 号：P412.25[天文地球—大气科学及气象学] P458.12