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李德俊, 熊守权, 柳草, 韩琦, 袁正腾, 王慧娟, 徐桂荣. 2013: 武汉一次短时暴雪过程的地面雨滴谱特征分析. 暴雨灾害, 32(2): 188-192. DOI: 10.3969/j.issn.1004-9045.2013.02.013
引用本文: 李德俊, 熊守权, 柳草, 韩琦, 袁正腾, 王慧娟, 徐桂荣. 2013: 武汉一次短时暴雪过程的地面雨滴谱特征分析. 暴雨灾害, 32(2): 188-192. DOI: 10.3969/j.issn.1004-9045.2013.02.013
LI Dejun, XIONG Shouquan, LIU Cao, HAN Qi, YUAN Zhengteng, WANG Huijuan, XU Guirong. 2013: Characteristic analysis of a short-range snowstorm event in Wuhan based on ground raindrop spectra data. Torrential Rain and Disasters, 32(2): 188-192. DOI: 10.3969/j.issn.1004-9045.2013.02.013
Citation: LI Dejun, XIONG Shouquan, LIU Cao, HAN Qi, YUAN Zhengteng, WANG Huijuan, XU Guirong. 2013: Characteristic analysis of a short-range snowstorm event in Wuhan based on ground raindrop spectra data. Torrential Rain and Disasters, 32(2): 188-192. DOI: 10.3969/j.issn.1004-9045.2013.02.013

武汉一次短时暴雪过程的地面雨滴谱特征分析

Characteristic analysis of a short-range snowstorm event in Wuhan based on ground raindrop spectra data

  • 摘要: 利用Thies Clima激光雨滴谱仪(TCLPM)和站点加密观测资料,对2011年2月12日发生在武汉的一次短时暴雪天气过程的演变特征进行了初步分析。结果表明: 人工观测与激光雨滴谱仪自动探测的累积降雪量较为一致,均为5.6 mm。该短时暴雪过程,先后经历降雨、雨夹雪和纯雪三个阶段,且激光雨滴谱仪监测到了这三种降水相态对应的不同滴谱特征,即: 降雨阶段,粒子下落速度大而粒径小;纯雪阶段,粒子下落速度小而粒径大。同时,监测到三个阶段雨滴谱型的变化较明显,其经历了单峰、波动再多峰的演变过程,谱宽与数浓度呈明显增加趋势。降雨强度与反射率因子和粒子质量加权平均直径呈正相关: 雨强大对应反射率因子和雨滴平均直径值大,雨强小对应反射率因子和雨滴平均直径也小。

     

    Abstract: Data from Thies Clima laser precipitation monitor (TCLMP) and observations from intensive artificial weather stations were used to preliminarily analyze evolution characteristics of a short-range snowstorm event occurred on 12 February 2011 in Wuhan. The results show that cumulative snowfall of 5.6 mm by artificial observation is consistent with detecting one by TCLPM. This short-range snowstorm event has experienced three different periods such as rainfall, sleet and snowfall, and the different droplet spectra characteristics corresponding with three precipitation types have been monitored by TCLMP. During rainfall period, particle falling velocity is faster but particle diameter is smaller, while during snowfall period, particle falling velocity is slower but particle diameter is bigger. At the same time, the remarkable change of raindrop size distribution patterns in three periods have been monitored, and the patterns experience a process from unimodal spectrum to undulation and then multimodal spectrum. Furthermore, both spectrum width and number concentration are significantly in increase trend. Rainfall intensity has a positive correlation with both reflectivity factor and massweighted mean diameter of particle, namely, higher rainfall intensity corresponds with larger reflectivity factor and bigger raindrops average diameter, and vice versa.

     

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