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呼和浩特降雨和降雪过程粒子谱分布特征分析
李慧1, 苏立娟1, 郑旭程1, 李汉超1, 李盈盈2, 张敏3, 甄林峰3
(1.中国气象局乌鲁木齐沙漠气象研究所/中亚大气科学研究中心,内蒙古自治区气象科学研究所,内蒙古自治区人工影响天气重点实验室;2.慈溪市气象局;3.内蒙古自治区气象科学研究所,内蒙古自治区人工影响天气重点实验室)
Analysis on Characteristics of Particle Size DistributionDuring Rain and Snow Process in Hohhot
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投稿时间:2019-11-08    修订日期:2020-11-18
中文摘要: 为深入了解呼和浩特地区降雨和降雪过程中降水粒子谱的分布特征,利用PARSIVEL观测数据并结合常规观测资料,对2017-2019年发生在呼和浩特地区的8次降雨过程和10次降雪过程的降水粒子谱进行分析。结果表明:雨滴谱和雪花谱都比较符合Gamma分布,平均降雪谱的峰值直径、峰值浓度以及最大直径均大于平均雨滴谱,降水强度相近时,降雪个例的粒子数浓度和尺度参数均大于降雨个例;Gamma拟合的形状因子μ和斜率参数Λ在降雨和降雪过程中均满足二项式关系,但雪花尺度的变化范围较大导致降雪的μ-Λ拟合效果略差;雪花的下落速度小于雨滴的下落速度,降雨过程中雨滴的落速多集中于2~5 m·s-1,而降雪过程雪花的落速多集中于0.5~2 m·s-1,呼和浩特地区降雪的雪花落速更接近于未结凇或干雪的情况。
中文关键词: 降雨  降雪  粒子谱  微物理特征量  下落速度
Abstract:In order to understand the characteristics of particle size distribution during rain and snow process, ground-based measurements of particle spectrum using a PARSIVEL disdrometer were compared among samples obtained in 8 rain processes and 10 snow processes in Hohhot from 2017 to 2019. The results show that both the size distribution of raindrop and snowflake are in good agreement with the Gamma distribution, the spectrum width, peak concentration and corresponding diameter of snow spectrum were larger than those of raindrop spectrum, and the snow cases always have larger particle concentration and scale parameters compared to the rain cases while the precipitation intensity were similar. The parameters μ and Λ of Gamma function correspond to the shape and slope of the spectrum, and they satisfied binomial function relationship during both rainfall and snowfall, but the fitting effect is poor during snowfall because of the too large scale range of snowflake. The particle velocity was larger for snowflake than for raindrop, the falling velocity of raindrops was mostly concentrated at 2~5 m·s-1, while the falling velocity of snowflake was mostly concentrated at 0.5~2 m·s-1, and closer to the speed curve of unfrozen snowflake in comparison.
文章编号:201911080394     中图分类号:P426    文献标志码:
基金项目:中央级公益性科研院所基本科研业务费专项资金项目(IDM2018012)、内蒙古自治区气象局科技创新项目(nmqxkjcx201604)
引用文本:
李慧,苏立娟,郑旭程,李汉超,李盈盈,张敏,甄林峰,0.[en_title][J].Meteor Mon,():-.
LI Hui,SU Li-juan,ZHEN Xu-cheng,LI Han-chao,LI Ying-ying,Zhang Min,Zhen Lin-Feng,0.Analysis on Characteristics of Particle Size DistributionDuring Rain and Snow Process in Hohhot[J].Meteor Mon,():-.