Tropospheric aerosol layers: features of variations in aerosol parameters when changing the direction of air advection
S.V. Samoilova, Yu.S. Balin, G.P. Kokhanenko, S.V. Nasonov, I.E. Penner
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: аэрозоль, лидар, пограничный слой, свободная тропосфера, оптические и микрофизические параметры, aerosol, lidar, boundary layer, free troposphere, optical and microphysical parameters
Abstract
Data of multifrequency sensing make it possible to study the aerosol layers with different scattering and absorbing properties and to retrieve their optical and microphysical characteristics. The air advection effect on aerosol parameters in the lower and middle troposphere is analyzed. Low values of the extinction and backscattering coefficients and of the imaginary part of the refractive index and geometric mean radius of fine aerosol particles are characteristic of the north direction of transfer. High values of these parameters are observed at the south direction of transfer. On the contrary, the lidar ratio and the contribution of fine fraction into the total concentration of particles decrease at the change of the transfer direction from north to south.
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