The correction of near range multiwavelength lidar optical parameter based on the measurements of particle size distribution

The lidar observations of aerosol for near range have distortion because of insufficient overlapping between the transmitting laser beam and the field of view of receiving telescope in non-coaxial lidar. The distortion becomes more typical and more complicated in multiwavelength lidar. However, the area of near range atmosphere has a close relationship with human activity. So it is important to correct the near range signal of multiwavelength lidar. This paper describes a practical method for correction of the near range optical parameter of multiwavelength lidar based on aerosol particle size distribution measurement and Mie scattering theory. The near range aerosol extinction profiles at fine day, cloudy day and foggy day are corrected and the results prove the feasibility of the method and practical. This method reduces the uncertainty of inversion and correction because taking into account the wavelength dependence of lidar ratio and the weather correlation of aerosol size distribution. This method realizes the correction of near range optical parameter of multiwavelength lidar using paticle size distribution. It is practical and convenient using this method to study physical and optical property of boundary layer atmosphere.