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遥感技术与应用  2016, Vol. 31 Issue (6): 1045-1053    DOI: 10.11873/j.issn.1004-0323.2016.6.1045
微波遥感专栏     
暴雨过程中天气雷达强度与衰减关系的研究
张鹏1,李兆明2,薛杨1,宋堃1
(1.解放军理工大学气象海洋学院,江苏 南京 211101;
2.中国科学院大气物理研究所,北京 100029)
Study on the Relationship between the Radar Intensity and the Attenuation in a Rainstorm
Zhang Peng,Li Zhaoming,Xue Yang,Song Kun
(1.Institute of Meteorology and Ocean,PLA University of Science
and Technology,Nanjing 210007,China;
2.LAGEO,of Atmospheric Physics Chinese,Chinese Academy of Sciences,Beijing100029,China)
 全文: PDF(4731 KB)  
摘要:

为提高天气雷达定量估测暴雨雨量的能力,利用一条沿X波段天气雷达径向的微波链路获得路径总衰减,使用改进的最小残差法,对一次暴雨过程中衰减系数(k)与X波段天气雷达反射率因子(Z)关系k=aZb中的系数a、b进行了计算,同时实现了相应径向反射率因子的衰减订正。实验结果表明,最优系数a的平均值为5.2×10-5,标准差为2.9×10-5,b的平均值为1.068,标准差为0.118。与已有文献相关结论相比,系数a值较小,而系数b值较大。联合微波链路对雷达相应径向实施衰减订正,可以有效避免常规逐库订正方法中不稳定问题,订正结果合理,订正后雨强估计结果更加接近雨量计实测值。所得结论可供天气雷达反射率因子衰减订正和定量估测暴雨雨量时参考应用。

关键词: 微波链路暴雨天气雷达衰减订正k-Z关系    
Abstract:

To enhance the ability of weather radar to estimate precipitation quantitatively,the coefficients a and b in the relationship k=aZ b between the specific attenuation k and the reflectivity factor Z of an X-band weather radar were retrieved using the revised least residual error method.In the method,the path integrated attenuation was obtained by a microwave link which was set up along the radial of the X-band weather radar.At the same time,the attenuation correction of the reflectivity factors along the corresponding radial was realized.Experiment on real data shows that the mean of the optimal a is 5.2×10-5with a standard deviation of 2.9×10-5 and the mean of the optimal b is 1.068 with a standard deviation of 0.118.Comparing with the results in the literatures,the a is relatively smaller and b is larger.Assisted by the microwave link,the radar reflectivity factors can be corrected for attenuation effectively and the instability problem is addressed.After correction,the radar reflectivity factors are more reliable.The estimated rainrate using the corrected reflectivities are more closer to the raingauge measurements than using the uncorrected reflectivities.The results of this experiment can be applied in attenuation correction and quantitative precipitation estimation.

 

Key words: Microwave link    Rainstorm    Weather radar    Attenuation correction    k-Z relationship
收稿日期: 2015-11-26 出版日期: 2016-12-30
:  TN 959.4  
基金资助:

江苏省自然科学基金青年基金项目“基于双频微波链路的天气雷达衰减订正技术研究”(BK20150708),江苏省气象探测与信息处理重点实验室(南京信息工程大学)开放基金项目“联合天气雷达的毫米波测云雷达回波衰减订正方法研究”(KDXS1306)。

作者简介: 张鹏(1976-) ,男,山东济南人,讲师,主要从事大气遥感研究。Email: radarpeng@126.com。
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引用本文:

张鹏,李兆明,薛杨,宋堃. 暴雨过程中天气雷达强度与衰减关系的研究[J]. 遥感技术与应用, 2016, 31(6): 1045-1053.

Zhang Peng,Li Zhaoming,Xue Yang,Song Kun. Study on the Relationship between the Radar Intensity and the Attenuation in a Rainstorm. Remote Sensing Technology and Application, 2016, 31(6): 1045-1053.

链接本文:

http://www.rsta.ac.cn/CN/10.11873/j.issn.1004-0323.2016.6.1045        http://www.rsta.ac.cn/CN/Y2016/V31/I6/1045

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