Features of retrieval of microstructural parameters of aerosol from measurements of aerosol optical depth. Part II. Inversion results

Annual cycle in the variability of aerosol microstructure parameters according to solar photometry data

“…Figure 4a shows retrieval results for the geometric cross section S (tot) with the separation into the fine S (f) (curve 1) and coarse fractions S (c) (curve 2) averaged for each month. The boundary between the aerosol fractions was supposed to be fixed and equal, as in [7], to 0.55 μm.…”

“…According to results of the study of statistical rela tionships between AOD measurements in summer 2003 and aerosol microstructure parameters retrieved in the process of solving the inverse problem [7], there exists a high correlation between the AOD τ(0.55) at a wave length λ = 0.55 μm and volume concentration of fine aerosol V (f) ; the correlation coefficient ρ = 0.97. With an increase in the wavelength, the coefficient of correla tion between τ(0.55) and V (f) decreases and is equal to 0.72 at λ = 1.052 μm.…”

“…In addi tion, a detailed consideration of hourly average depen dencies can reveal individual situations in which the contribution of fine particles in the total volume becomes on the same order as that of coarse particles (May-June, 2004) and even dominates over it (August, 2003 [7]). As was shown in [7], the increased concentration of fine particles in August, 2003, is related to the release of smoke aerosol into the atmo sphere. The ratio of the volume concentrations of par ticles from the two fractions varies from 1.12 (December, 2003) to 4.3 (February, 2004).…”

“…Developing the studies [7], in this work, we consider features revealed in the annual behavior of aerosol microstructure parameters in Tomsk on the same experimental and methodological base during solution of the inverse problem of solar spectrophotometry.…”

“…Using the developed software package, the variabil ity of aerosol microstructure parameters in JulyAugust, 2003, was studied in [7]. As the initial data for the analysis, AOD measurements carried out by S.M.…”