ESTIMATION OF THE ERROR CAUSED BY SMOOTHING ON DIAL MEASUREMENTS OF STRATOSPHERIC OZONE

Several ozone retrievals from DIAL (DIfferential Absorption Lidar) mea surements have been proposed. Each retrieval method has its own defini tion of the range resolutions and therefore one cannot easily compare the ozone concentration errors resulting from the use of these differe nt methods. In this paper, assuming the atmospheric model quoted from the U.S. Standard Atmosphere 1976 and the system constants of our lida r system, we numerically compared the differences between some represe ntative DIAL methods by means of estimating the error caused by smooth ing. Initially we defined a common range resolution as a scale. Using the common scale, we focused on the distortions arising from smoothing and the uncertainty of statistical signal errors. These estimates rev ealed that some algorithms reduce statistical error but make substanti al distortions at higher altitude. It was possible to distinguish for each algorithm both the statistical errors and the systematic errors.