Abstract
The spectral peculiarities of the distributions of the backscattering β a (λ i , z) and extinction σ a (λ i , z) coefficients, as well as lidar ratio S a (λ i , z) estimated from the data of multi-wavelength sensing in Tomsk (56° N, 85° E) in the height range from 0.5 to 7.5 km are presented here. Based on observations since April till October 2007 it is shown that in the boundary layer (except of the internal mixing layer) ηβ(532/1064) > ηβ(355/532), and, simultaneously, ησ(532/1064) > ησ(355/532), where η i are the values of the Ågström parameter for the respective coefficients. Such a distribution of the Ågström parameters is caused by prevalence of small particles with mean geometric radius R f < 0.15 μm in the volume distribution. On the contrary, in the free troposphere ηβ(532/1064) < ηβ(355/532) and ησ(532/1064) < ησ(355/532). Hence, R f > 0.15 μm, and the contribution of large particles is governing. In the boundary layer, the lidar ratio decreases with increasing wavelength; the average values are 59.7 (15) sr at 355 nm, 51.1 (8.3) sr at 532 nm, and 47.3 (13.5) sr at 1064 nm. In the free troposphere, the wavelength behavior of the lidar ratio can be different; the average values are 50.4 (8.5) sr at 355 nm, 49.5 (5.7) sr at 532 nm, and 55.3 (10) sr at 1064 nm. The aerosol contribution of the free troposphere to the total aerosol optical depth grows with decreasing boundary layer height; on average, it is 22 (17)% at 355 nm, 27 (19)% at 532 nm, and 34 (22)% at 1064 nm.
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Original Russian Text © S.V. Samoilova, Yu.S. Balin, G.P. Kokhanenko, I.E. Penner, 2012, published in Optica Atmosfery i Okeana.
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Samoilova, S.V., Balin, Y.S., Kokhanenko, G.P. et al. Investigation of the vertical distribution of tropospheric aerosol layers using the data of multiwavelength lidar sensing. Part 3. Spectral peculiarities of the vertical distribution of the aerosol optical characteristics. Atmos Ocean Opt 25, 208–215 (2012). https://doi.org/10.1134/S1024856012030098
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DOI: https://doi.org/10.1134/S1024856012030098