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

Li Tao; Ruan Zheng; Ge Runsheng; Jin Long

doi:10.11898/1001-7313.20160103

Vol.27, NO.1, 2016

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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.

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

DOI: 10.11898/1001-7313.20160103

Li Tao^1,2,
Ruan Zheng^{2
,
,},
Ge Runsheng²,
Jin Long¹

1.
Chengdu University of Information Technology, Chengdu 610225
2.
State Key Lab of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081

Received Date: 2015-08-12
Rev Recd Date: 2015-11-04
Publish Date: 2016-01-31

Abstract

Abstract

The error of raindrop size distribution estimation using PARSIVEL disdrometer is carefully studied, and an error correction method is proposed. Raindrop distribution data of two kind of precipitation by PARSIVEL disdrometer at Yangjiang in 2014 are analyzed. Results show that, the measured raindrop size distribution data are in good consistency with the empirical curve from Atlas, but the velocity measurement error is large when the particle size is below 1 mm or above 3 mm. The error analysis indicates that velocity measurement error of big particle is caused by deformation, while the error of small particle is caused by the instrument itself, and the vertical air motion near the disdrometer is influential for both situations.According to the detective principle of PARSIVEL disdrometor and the relationship between the deformation particle, a corrected Atlas-Ulbrich curve is given. The detective data of stratiform cloud precipitation are stable. An correction error curve of small particles is given by calculating the vertical air velocity of no less than 1 mm in diameter data from the stable precipitation, excluding the air motion in the diameter less than 1 mm. Small particle data are corrected, and the corrected raindrop distribution data are in good consistency with corrected Atlas-Ulbrich curve. The droplet concentration increases significantly and large drops concentration reduce slightly after correction. The intercept, slope and shape parameters of Gamma distribution of two kinds of precipitations are calculated before and after the correction, and the comparison shows that the corrected intercept parameter and slope parameter increase obviously, while the shape parameter barely changes.
- PARSIVEL disdrometer;
- the measurement error;
- corrected Atlas-Ulbrich curve;
- raindrop size distribution

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References(22)

Figures and Tables

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

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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

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图 3 PARSIVEL测得的雨滴分布和V_b-D_a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

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

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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V_b-D_a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 V_b-D_a curve, (b) velocity error distribution

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图 6 测速修正后的雨滴分布和V_b-D_a曲线

(a) 层状云，(b) 对流云

Fig. 6 Velocity revised of small particle and V_b-D_a curve

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

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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

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

时间	订正前			订正后
时间	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

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

时间	订正前			订正后
时间	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

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