毫米波云雷达反演层云微物理参数的个例试验

A Case Test of Retrieving Stratus Microphysics Parameters from Millimeter-wave Cloud Radar

为了研究层状云微物理性质,了解层云粒子分布特征,通过毫米波雷达收集的功率谱数据估算层状云中的空气湍流谱宽值,并利用雷达回波强度、多普勒速度、速度谱宽及湍流谱宽值得到层状云微物理参数反演公式。将反演得到的反射率谱与毫米波雷达实测反射率谱进行对比,发现反演的反射率谱与雷达实测反射率谱比较类似,结果验证了反演方法的合理性。研究结果表明,层云反演方法能够比较准确的反演层云微物理参数,反演结果对了解层状云微物理性质与分布特征具有一定的参考意义。

The turbulent spectral width of the stratus is estimated by using spectral data collected by the millimeter- wavelength radar, then obtained the retrieval formula of stratus by using radar reflectivity, doppler velocity, doppler spectrum width and the turbulent spectral width of the stratus, thus to study the microphysical properties of stratus and distribution characteristics of the stratus particles. The retrieved reflectivity spectrum with the measured reflec- tivity spectrum from radar is compared. The result shows that the retrieved reflectivity spectrum is similar to the measured reflectivity spectrum. It proves that the retrieval algorithm is reasonable. The research concludes that the microphysical parameters of the stratus could be accurate retrieved by the retrieval formula of stratus, and has practi- cal significance for knowing microphysical properties and distribution characteristics of stratus.