乌鲁木齐地区两次暴雪过程的滴谱特征分析  

Droplet Spectrum Characteristics of Two Snowstorms in Urumqi

作　　者：王智敏 冯婉悦 李圆圆 李斌[1] 周雅蔓 海伦 WANG Zhimin;FENG Wanyue;LI Yuanyuan;LI Bin;ZHOU Yaman;HAI Lun(Xinjiang Weather Modification Office,Urumqi 830002,China;Xinjiang Meteorological Technology and Equipment Support Center,Urumqi 830002,China;Xinjiang Meteorological Observatory,Urumqi 830002,China)

机构地区：[1]新疆人工影响天气办公室,新疆乌鲁木齐830002 [2]新疆气象技术装备保障中心,新疆乌鲁木齐830002 [3]新疆气象台,新疆乌鲁木齐830002

出　　处：《沙漠与绿洲气象》2021年第3期62-68,共7页Desert and Oasis Meteorology

基　　金：中国气象局云雾物理环境重点开放实验室课题(2020Z00712);中亚大气科学研究项目(CAAS201919)。

摘　　要：利用乌鲁木齐气象站的激光雨滴谱仪观测数据,分析2018年3月17—18日和12月1日的两次暴雪天气的滴谱特征。结果表明:(1)两次过程的雪滴谱表现为单峰分布,粒子浓度峰值均在低谱段,雪滴谱宽度分别为0.42~4.63 mm和0.55~6.78 mm。(2)个例1中降雪云偏向于层状云类型,降雪主要由较小尺寸的霰或者凇附的冰相粒子组成,个例2中的降雪云偏向积层混合云类型,降雪主要以尺寸较大的干雪花为主。(3)两次降雪过程中的Dm和lgNW的拟合经验关系式呈现出明显的负相关。(4)拟合的本地化Z-R关系式分别为Z=171.7R^(2.22)和Z=518.7R^(2.27),两次降雪过程的雷达反射率因子平均值分别为20 dBZ和25 dBZ。Based on the laser raindrop spectrometer observation data of Urumqi Meteorological Station,the drop spectrum characteristics of the two snowstorms on March 17th-18th and December 1st,2018 were analyzed.The results were as follows.(1)The two droplet spectrums showed a single-peak distribution,and the particles had a peak concentration in low spectral ranges.The drop spectral width was between 0.42-4.63 mm and 0.55-6.78 mm,respectively.(2)In case 1,the snowfall cloud tended to be stratiform cloud type,and the snowfall was mainly composed of smaller-sized hail or rime-attached ice phase particles.The snowfall cloud in Case 2 tended to be cumulus hybrid cloud type,and the snowfall was mainly composed of large-sized dry snowflakes.(3)There was a significant negative correlation between Dm and lgNw during the two snowfall events.(4)The fitted Z-R relations were Z=171.7R^(2.22) and Z=518.7R^(2.27).The average radar reflectivity factor of the two snowfall processes was 20 dBZ and 25 dBZ,respectively.

关 键 词：雨滴谱 暴雪 乌鲁木齐 

分 类 号：P426.63[天文地球—大气科学及气象学]