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20 May 2013 A new method to retrieve aerosol extinction coefficients from elastic-Raman lidar data
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Abstract
Atmospheric aerosols have a significant impact on climate change through the scattering and absorption of incoming solar and outgoing thermal radiation. The aerosol optical properties can be directly measured using an elastic-Raman lidar. However, extraction of the extinction coefficient from the optical depth profile requires the use of numerical differentiation with these lidars, which suffers the random and systematic noises limitation and thereby reducing the detection sensitivity and accuracy. A new method to improve the quality of Raman lidar data processing is presented. Compared to the conventional method, the proposed method has the advantage, which can directly retrieve the aerosol extinction coefficients without numerical differentiation. Trial values of lidar ratio (from 10 to 90 sr with an increment of 1 sr) are applied to Fernald solution of the elastic lidar signals at 354.7 nm and all aerosol backscatter coefficients are obtained. The exact aerosol backscatter coefficients retrieved by combing elastic and Raman signals are used as constrain of these results of Fernald method to determine aerosol true lidar ratios as well as extinction coefficients. The numerical simulations demonstrated that the proposed method provides good accuracy and resolution of aerosol profile retrievals. And the method is also applied to elastic-Raman lidar measurements at the Hampton University, Hampton, Virginia.
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Jia Su, M. Patrick McCormick, and Liqiao Lei "A new method to retrieve aerosol extinction coefficients from elastic-Raman lidar data", Proc. SPIE 8731, Laser Radar Technology and Applications XVIII, 87310J (20 May 2013); doi: 10.1117/12.2014927; https://doi.org/10.1117/12.2014927
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