Lidar Rayleigh-fit criteria
The talk explains how aerosol-free regions in a lidar signal can be determined by means of the so-called Rayleigh-fit. Criteria based on statistical analyses of the residuals are proposed and explained in detail, which allow to assess the quality of the Rayleigh-fit. Some of the methods can be used to develop quantitative criteria for the uncertainty in the retrieved reference value for the lidar signal inversion.