Algorithm for retrieving vertical visibility of laser diode ceilometer
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摘要: 根据云高仪工作原理，从米散射激光雷达方程出发,推导出一种低层大气中气溶胶消光系数边界值的获取方法，并在此基础上利用Fernald方法反演得到了大气消光系数的垂直分布；通过垂直路径上的消光系数反演得到垂直路径的平均能见度，结果表明,该平均能见度更接近垂直方向真实的能见度。用该算法处理了半导体激光云高仪实际测量的数据，并与Vaisala云高仪测量的垂直能见度进行了对比，结果表明:该算法在反演大气垂直能见度时具有较高的准确性和可靠性。Abstract: The paper presents an inversion algorithm for laser diode ceilometer to retrieve the vertical visibility. According to the working principle of laser ceilometer, a method has been derived for determining the boundary value of the aerosol extinction coefficient in the lower troposphere from the elastic scattering lidar equation. Then the vertical distribution of the extinction coefficient can be retrieved by Fernald method, according to which the average visibility can be further retrieved in the vertical direction. The algorithm retrieves the vertical visibility from actual measurement data of ceilometer. The result comparison with Vaisala ceilometer shows that, the algorithm retrieves the vertical visibility more accurately and reliably.
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