2008—2021年呼伦贝尔市中西部强降雪天气雷达回波特征分析  

Analysis of Radar Echo Characteristics of Strong Snowfall Weather in Central and Western Hulunbuir from 2008 to 2021

作　　者：苗春艳 白子恒 刘伟 刘娜 MIAO Chunyan(Arong Banner Meteorological Bureau,Arong Banner,Inner Mongolia 162750)

机构地区：[1]阿荣旗气象局,内蒙古阿荣旗162750 [2]内蒙古呼伦贝尔市气象局,内蒙古呼伦贝尔021008 [3]海拉尔区气象局,内蒙古海拉尔021008

出　　处：《农业灾害研究》2022年第8期13-15,共3页Journal of Agricultural Catastrophology

摘　　要：利用2008—2021年呼伦贝尔市中西部5个气象站冬季降雪资料、NCEP 2.5°×2.5°再分析资料、海拉尔天气雷达(CINRAD-CD)回波资料,对发生在此期间14次强降雪天气过程环流形势及雷达产品特征进行形态判别及统计分析,结果表明:(1)呼伦贝尔市中西部2008—2021年的14次强降雪过程中,500 hPa影响系统10次为高空槽(涡),4次为平直西风;850 hPa多数伴有低空急流;地面影响系统多数为气旋顶部。(2)强降雪过程雷达回波平均强度为5~15 dBz,中心强度为15~25 dBz,回波多呈均匀片状,低仰角回波强度及范围明显大于高仰角;雨夹雪回波强度比纯雪回波强度略大。(3)绝大多数强降雪过程径向速度场回波无逆风区特征,“牛眼”结构出现比例仅为28.5%,“S”或反“S”结构比例为64.2%;速度模糊出现比例仅为21.4%;径向速度场上任意高度出现西北或偏北风,可以作为强降雪过程减弱或趋于结束的短时临近预报指标。Using the winter snowfall data of five meteorological stations in the central and Western Hulunbuir city from 2008 to 2021,NCEP 2.5°×2.5°reanalysis data and Hailar weather radar(CINRAD-CD) echo data,morphological discrimination and statistical analysis are carried out on the circulation situation and radar product characteristics of 14 strong snowfall weather processes during this period. The results show that:(1) The 500 hPa impact system of 14 strong snowfall processes in the central and Western Hulunbuir City from 2008 to 2021 is high trough(vortex) 10 times and flat westerly wind 4 times;850 hPa was mostly accompanied by low-level jet. Most of the ground impact systems are at the top of the cyclone.(2) In the process of heavy snowfall, the average intensity of radar echo is 5~15 dBz, and the central intensity was 15~25 dBz. The echo was mostly in uniform flakes, and the intensity and range of low elevation echo are significantly greater than that of high elevation. The echo intensity of sleet was slightly higher than that of pure snow.(3) Most of the radial velocity field echoes during strong snowfall have no upwind characteristics, and the proportion of“bull eye”structure was only 28.5%, and the proportion of“S”or anti“S”structure was 64.2%. The proportion of speed blur is only 21.4%. The occurrence of northwest or northerly winds at any height in the radial velocity field can be used as a short-term prediction index for the weakening or ending of the strong snowfall process.

关 键 词：强降雪过程 基本反射率因子 径向速度 导出产品 

分 类 号：P426.23[天文地球—大气科学及气象学]