NIGHT AND DAYTIME MEASUREMENTS OF OZONE IN A PLANETARY BOUNDARY-LAYERBY A DIFFERENTIAL ABSORPTION LIDAR

The description of an ozone differential absorption lidar for night an d daytime measurements in the low troposphere is presented. The wavele ngths of 268, 277, 292, 313, and 319 nm are efficiently generated by a Raman-shifted KrF laser and are used for the ozone sounding. The back scattered components are separated in a three-channel spectrum analyze r and are detected by photomultiplier tubes operated in the analog mod e. A comparison of the ozone profiles obtained by the use of different wavelength pairs demonstrates that in clean weather conditions the pa irs 268/292, 277/313, and 277/292 nm are almost equivalent for nightti me measurements in the boundary layer. Examples of lidar application f or the investigation of the daily ozone variation and the diurnal ozon e cycle are given.