LAUSR

Results of studying the time variations in aerosol microstructure parameters retrieved by inverting the spectral measurements of the aerosol optical depth are presented. The input data were obtained at the Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences using SP-type sun photometers during periods of observations in 2003–2006 and 2011–2014. During the first period, aerosol optical depth was measured at 13 wavelengths in the range 0.37–4 μm. In the second period, the upper boundary of the wavelength range of measurements was 2.14 μm. The total amount of data processed had been more than 7000 hourly average spectra. The aerosol microstructure parameters, such as the geometric cross section, volume concentration, and average particle radius, were analyzed.