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激光雨滴谱仪测速误差对雨滴谱分布的影响

李淘 阮征 葛润生 金龙

李淘, 阮征, 葛润生, 等. 激光雨滴谱仪测速误差对雨滴谱分布的影响. 应用气象学报, 2016, 27(1): 25-34. DOI: 10.11898/1001-7313.20160103..
引用本文: 李淘, 阮征, 葛润生, 等. 激光雨滴谱仪测速误差对雨滴谱分布的影响. 应用气象学报, 2016, 27(1): 25-34. DOI: 10.11898/1001-7313.20160103.
Li Tao, Ruan Zheng, Ge Runsheng, et al. Impacts of raindrop velocity measurement error on raindrop size distribution estimation from PARSIVEL disdrometer. J Appl Meteor Sci, 2016, 27(1): 25-34. DOI:  10.11898/1001-7313.20160103.
Citation: Li Tao, Ruan Zheng, Ge Runsheng, et al. Impacts of raindrop velocity measurement error on raindrop size distribution estimation from PARSIVEL disdrometer. J Appl Meteor Sci, 2016, 27(1): 25-34. DOI:  10.11898/1001-7313.20160103.

激光雨滴谱仪测速误差对雨滴谱分布的影响

DOI: 10.11898/1001-7313.20160103
资助项目: 

公益性行业 (气象) 科研专项 GYHY201406013

公益性行业 (气象) 科研专项 GYHY201306004

国家自然科学基金项目 41475029

详细信息
    通信作者:

    阮征, email: ruanz@camscma.cn

Impacts of Raindrop Velocity Measurement Error on Raindrop Size Distribution Estimation from PARSIVEL Disdrometer

  • 摘要: 该文研究PARSIVEL激光雨滴谱仪的测量误差并提出订正方法。对2014年在广东阳江的PARSIVEL激光雨滴谱仪采集的两次降水过程数据进行分析发现,雨滴下落速度V随粒径D变化与静止大气中雨滴下落末速度随粒径变化的Atlas-Ulbrich曲线分布趋势一致,但D < 1 mm及D > 3 mm的速度偏差较大。其主要原因是大粒径雨滴形变造成速度偏离较大,仪器测量误差造成小粒径测速偏大,激光雨滴谱仪所在高度的大气垂直运动影响雨滴下落速度。根据PARSIVEL激光雨滴谱仪测量原理,基于雨滴形变与粒径关系,给出形变订正后的Atlas-Ulbrich修正曲线,并用于对小粒径测速订正。比较订正前后的雨滴谱分布,订正后的小雨滴浓度明显增加,大雨滴浓度略有减小,订正后浓度参数和斜率参数均增加,形状参数变化不明显。
  • 图  1  2014年5月8日C-FMCW雷达探测层状降水云时序图与地面雨滴分布

    (a) 回波强度,(b) 径向速度,(c) 地面雨滴分布及Atlas-Ulbrich曲线

    Fig. 1  Stratiform cloud evolution sequence diagram and raindrop distribution by C-FMCW on 8 May 2014

    (a) reflectivity, (b) radial velocity, (c) raindrop distribution and Atlas-Ulbrich curve

    图  2  2014年5月10日C-FMCW雷达探测对流云降水时序图与地面雨滴分布

    (a) 回波强度,(b) 径向速度,(c) 地面雨滴分布及Atlas-Ulbrich曲线

    Fig. 2  Convective cloud evolution sequence diagram and raindrop distribution by C-FMCW on 10 May 2014

    (a) reflectivity, (b) radial velocity, (c) raindrop distribution and Atlas-Ulbrich curve

    图  3  PARSIVEL测得的雨滴分布和Vb-Da修正曲线

    (a) 层状云降水,(b) 对流云降水

    Fig. 3  Raindrop data distribution after curve revised

    (a) the stratiform precipitation, (b) the convective precipitation

    图  4  2014年5月8日层状云降水近地面 (1.4 m) 大气平均垂直运动速度

    Fig. 4  The average vertical velocity of air motion near the ground (1.4 m) at stratiform precipitation on 8 May 2014

    图  5  小粒径测速误差分布订正曲线

    (a) 大气垂直运动速度订正后小粒径雨滴分布与Vb-Da曲线,(b) 平均测速误差ΔV随粒径分布

    Fig. 5  Velocity error distribution of small particle

    (a) small particle distribution and Vb-Da curve, (b) velocity error distribution

    图  6  测速修正后的雨滴分布和Vb-Da曲线

    (a) 层状云,(b) 对流云

    Fig. 6  Velocity revised of small particle and Vb-Da curve

    (a) the stratiform precipitation, (b) the convective precipitation

    图  7  对流云降水0.937 mm粒子数 (a) 和1.375 mm粒子数 (b) 与近地面大气平均垂直速度关系

    Fig. 7  Relatioships between the number of 0.937 mm particles (a), the number of 1.375 mm particles (b) of convective precipitation and the average vertical velocity of the air motion near the ground

    表  1  层状云降水Gamma函数3个参数订正前后比较

    Table  1  Three parameters of the Gamma distribution before and after correction of the stratiform precipitation

    时间 订正前 订正后
    N0/(m-3·mm-1-μ) μ Λ/mm-1 N0/(m-3·mm-1-μ) μ Λ/mm-1
    20:18-20:29 1.98×104 3.98 5.07 2.58×104 3.71 5.19
    20:30-20:41 3.55×104 3.51 5.40 4.48×104 3.20 5.50
    下载: 导出CSV

    表  2  对流云降水Gamma函数3个参数订正前后比较

    Table  2  Three parameters of the Gamma distribution before and after correction of the convective precipitation

    时间 订正前 订正后
    N0/(m-3·mm-1-μ) μ Λ/mm-1 N0/(m-3·mm-1-μ) μ Λ/mm-1
    19:00-19:14 1.20×103 -0.25 1.41 1.70×103 -0.07 1.63
    19:15-19:29 1.59×103 0.21 1.34 2.22×103 0.27 1.52
    19:30-19:44 2.08×103 0.54 1.51 2.94×103 0.73 1.73
    19:45-19:59 2.22×103 0.06 1.34 3.08×103 0.15 1.52
    下载: 导出CSV
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  • 收稿日期:  2015-08-12
  • 修回日期:  2015-11-04
  • 刊出日期:  2016-01-31

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