衰减订正技术在C波段雷达降水估测中的应用

目的]研究衰减订正技术在C波段雷达降水估测中的应用。方法]应用陕西CINRAD-CB雷达资料,分别采用迭代法和逐库法进行衰减订正试验研究,并进行了逐库衰减订正法在定量降水估测中的应用试验。结果]衰减订正技术能弥补远距离回波衰减问题。迭代法计算结果最终趋于逐库法,且耗费机时较多,因此,逐库衰减订正技术更适合业务运行。当强回波距离雷达较近时,产生的衰减较明显,衰减订正的应用价值较大。将衰减订正技术应用于定量降水估测,有助于提高降水估测准确率,但要对降水估测计算方案进行细致规划,不同的计算方案对定量降水估测精度影响较大。结论]该研究为提高陕西省定量降水估测精度提供了依据。

Application of the Attenuation Correction Technology in C-band Radar Precipitation Estimation

Objective] The research aimed to study application of the attenuation correction technology in C-band radar precipitation estimation.Method] Based on CINRAD-CB radar data in Shaanxi,we conducted the attenuation correction experiment by using iteration method and kufa method respectively.Moreover,we conducted application experiment of the kufa attenuation correction method in the quantitative precipitation estimation.Result] Attenuation correction technology could compensate for attenuation problem of the echo at the distant range.Calculation result of the iteration method finally tended to that of kufa method.Moreover,iteration method spent more time.Therefore,kufa attenuation correction technology was more suitable for business operation.When strong echo was near radar,attenuation was more obvious,and application value of the attenuation correction was bigger.Attenuation correction technology was used for quantitative precipitation estimation,which was favorable for improving accuracy of the precipitation estimation.But we should conduct detailed planning on calculation scheme of the precipitation estimation because that different calculation schemes had great influences on accuracy of the quantitative precipitation estimation.Conclusion] This research provided a basis for improving accuracy of the quantitative precipitation estimation in Shaanxi.