Two iterative methods of inverting lidar backscatter signals to determine altitude profiles of aerosol extinction and altitude-resolved aerosol size distribution (ASD) are presented. The first method is for inverting two-wavelength lidar signals in which the shape of the ASD is assumed to be of power-law type, and the second method is for inverting multiwavelength lidar signals without assuming any <i>a priori</i> analytical form of ASD. An arbitrary value of the aerosol extinction-to-backscatter ratio (<i>S</i><sub>1</sub>) is assumed initially to invert the lidar signals, and the ASD determined by use of the spectral dependence of the retrieved aerosol extinction coefficients is used to improve the value of <i>S</i><sub>1</sub> iteratively. The methods are tested for different forms of altitude-dependent ASD’s by use of simulated lidar-backscatter-signal profiles. The effect of random noise on the lidar backscatter signals is also studied.
© 1998 Optical Society of America
K. Rajeev and K. Parameswaran, "Iterative Method for the Inversion of Multiwavelength Lidar Signals to Determine Aerosol Size Distribution," Appl. Opt. 37, 4690-4700 (1998)