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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. 

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