Error Estimation in Wind Fields Derived from Dual-Doppler Radar and Data Quality Control

Liu Liping; Zhang Peiyuan; Liang Haihe; Niu Fang; Zhou Haiguang

Vol.14, NO.1, 2003

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2003 > 14(1): 17-29

Liu Liping, Zhang Peiyuan, Liang Haihe, et al. Error estimation in wind fields derived from dual-Doppler radar and data quality control. J Appl Meteor Sci, 2003, 14(1): 17-29.

Citation:

Liu Liping, Zhang Peiyuan, Liang Haihe, et al. Error estimation in wind fields derived from dual-Doppler radar and data quality control. J Appl Meteor Sci, 2003, 14(1): 17-29.

Liu Liping, Zhang Peiyuan, Liang Haihe, et al. Error estimation in wind fields derived from dual-Doppler radar and data quality control. J Appl Meteor Sci, 2003, 14(1): 17-29.

Citation:

Liu Liping, Zhang Peiyuan, Liang Haihe, et al. Error estimation in wind fields derived from dual-Doppler radar and data quality control. J Appl Meteor Sci, 2003, 14(1): 17-29.

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Error Estimation in Wind Fields Derived from Dual-Doppler Radar and Data Quality Control

Chinese Academy of Meteorological Sciences, Beijing 100081

Received Date: 2001-12-27
Rev Recd Date: 2002-03-01
Publish Date: 2003-02-28

Abstract

Abstract

The method for quality control of dual-Doppler radar reflectivity, radial velocity and azimuthal location is introduced. The reflectivity correction approach with probability distribution method is presented. The two dual-Doppler radar systems in Hefei and Ma’anshan, Anhui Province, Yichang and Jiangzhou, Hubei Province, were used to observe the wind structure of the precipitation systems in the China Heavy Rainfall Experiment and Study in 2001. The reflectivities and radial velocities from the dual-Doppler radar are compared and the effect of azimuth location on dual-Doppler radar data is analyzed. The errors of wind derived from the two Doppler radar systems are estimated. The results show that the patterns of reflectivity and radial velocity measured by the Doppler radar systems are similar; but the values of reflectivity measured at Hefei and Ma’anshan are obviously different; the deviation of velocity measured by the two radars is 1-2 m/s. The error of wind derived from dual-Doppler radar is relative to wind direction, speed and position. The error is within 2 times of the measurement error of radial velocity in the area where the angle between the two radial velocities is in 40o-140 o. These results are valuable for the use of the dual-Doppler radar data and the observation by dual-Doppler radar.
- Dual Doppler radar;
- Error analysis;
- Quality control

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References(6)

Figures and Tables

图 1 双多普勒雷达观测示意图

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图 2 双多普勒雷达反演风场示意图

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图 3 雷达测量径向速度的统计误差引起的合肥、马鞍山双多普勒雷达 (a) 和宜昌、荆州双多普勒雷达 (b) 的σ_x(单位:m/ s)

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图 4 雷达测量径向速度的统计误差引起的合肥、马鞍山双多普勒雷达 (a) 和宜昌、荆州双多普勒雷达 (b) 的σ_y(单位:m/s)

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图 5 在Ψ=45°, V=10 m/s时, 风速大小 (a) 和方向 (b) 的反演误差 (单位:风速—m/s, 方向—°)

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图 6 雷达测量径向速度的系统误差造成的垂直于雷达连线的速度分量的反演误差 (m/ s)

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图 7 2001年6月18日13:00合肥雷达、马鞍山雷达观测的回波强度 (Z) l km×1 km格点在方位旋转前（a) 和旋转后（b) 一对一的对比和不同回波强度的概率（P）分布图 (c)(Z1为合肥雷达观测的回波强度，Z2为马鞍山雷达观测的回波强度）

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图 8 2001年7月13日19:04合肥雷达、马鞍山雷达观测的回波强度l km×1 km格点在方位旋转前（a) 和旋转后（b) 一对一的对比和不同回波强度的概率分布图 (c)(Z1为合肥雷达观测的回波强度，Z2为马鞍山雷达观测的回波强度）

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图 9 2001年6月17日22:57宜昌、荆州雷达观测的回波强度l km×1 km格点在方位旋转前（a) 和旋转后（b) 的对比及不同回波强度的概率分布图 (c)(Z1为宜昌雷达观测的回波强度，Z2为荆州雷达观测的回波强度）

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图 10 2001年6月18日13:00 (a) 和7月14日03:22 (b) 合肥、马鞍山雷达连线上方2 km等高线上的径向速度的对比 (其中将马鞍山的径向速度改变了符号以方便比较)

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图 11 2001年6月28日00:28宜昌、荆州雷达连线上方2 km等高线上的径向速度的对比 (其中将荆州的径向速度改变了符号以方便对比)

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表 1 多普勒雷达系统主要参数

表 2 马鞍山、荆州雷达不同旋转角度时配对雷达1 km×1 km格点上回波的标准差和相关系数

References

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