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Home  >  Volume 26 (March 2014)

28. The Effects of Soot on the Hygroscopicity of Urban Aerosols by B. I. Tijjani and G.S.M. Galadanci. Volume26, (March, 2014), pp 202 – 219.
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In this paper, the author investigated some microphysical and optical properties of urban aerosols extracted from OPAC by varying the concentrations of soot and determined the effect of hygroscopic growth at the spectral range of 0.25μm to 2.5μm and eight relative humidities (RHs) (0, 50, 70, 80, 90, 95, 98, and 99%).The microphysical properties extracted were radii, volume mix ratio, number mix ratio, mass mix ratio and refractive indices while the optical properties are optical depth and asymmetric parameters all as a function of RHs. Using the microphysical properties, growth factors of the mixtures were determined while using optical depths we determined the enhancement parameters and were then parameterized using some models to determine their relationships with RHs. The data fitted the models very well. The hygroscopicity found using volume mix ratio is found to have higher values. The angstrom coefficients show that the mixtures have bimodal type of distribution with the dominance of fine mode particles and increased with the increase in soot concentrations and RHs. 

Keywords: microphysical properties, optical properties, hygroscopic growth, enhancement parameter, spectral range, Angstrom coefficients, bimodal.