DETERMINATION OF WATER-VAPOR AND AEROSOL DENSITIES IN THE TROPOSPHERIC ATMOSPHERE FROM NITROGEN AND WATER-VAPOR RAMAN SIGNALS

A Raman lidar system has been developed for the measurement of the wat er-vapor mixing ratio and the aerosol backscatter and extinction coeff icients. To suppress the elastic scattering from the XeCl excimer lase r, an acetone edge filter and narrow-band interference filters are use d. By using independently calculated backscatter and extinction coeffi cients, we calculate the lidar ratios (extinction coefficient divided by the backscatter coefficient). The obtained ratios between 30 and 50 sr explain the special characteristics of the aerosol existing in the atmosphere. These ratios are also used as important parameters in the lidar inversion program. We have also obtained the water-vapor mixing ratio and find that big differences exist between the ratios inside t he boundary layer and those of other regions.