Joint retrieval of the microphysical characteristics, complex refractive index, and particle size distribution function from lidar measurements
S.V. Samoilova, I.E. Penner, G.P. Kokhanenko, Yu.S. Balin
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, 1, Academician Zuev square, Tomsk, 634021, Russia
Keywords: аэрозоль, лидар, функция распределения частиц по размерам, показатель преломления, аэрозоль, лидар, функция распределения частиц по размерам, показатель преломления, aerosol, lidar, particle size distribution function, refractive index
Abstract
Results of the analysis of microphysical characteristics obtained from the data of nighttime Raman lidar measurements in Tomsk (56N, 85E) in 2013 within the CIS-LiNet project (lidar networks in CIS countries) are presented. Theoretical aspects of the retrieval of the particle size distribution function at the preset refractive index are considered. It is shown that the coarse fraction is retrieved ambiguously. Parabolic approximation of the mean size of coarse particles, Rcoarse, is suggested, which allows calculation of the size distribution function determine for particles of up to 3 mm in size. It is shown that when estimating the parameters under study together, the retrieved refractive index is non-linearly related with the optical coefficients and the distribution function, which leads to appearance of different, including false values of therefractive index. The parameters are assessed for the boundary air layer and middle troposphere.
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