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Home  >  Volume 28. No.2 (Nov. 2014)

45. The Effect of Relative Humidityon Antarctic Sea Aerosols by G.S.M. Galadanciand B. I. Tijjani - Volume28, No. 2, (November, 2014), pp 333 – 350
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In this paper, we investigated some microphysical and optical properties of Antarctic sea aerosols from OPAC to determine 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 and mass mix ratio as a function of RH while the optical properties are scattering and absorption coefficients and asymmetric parameters. Using the microphysical properties, growth factors of the mixtures were determined while using optical properties we determined the enhancement parameters and were then parameterized using some models. We observed that the data fitted the models very well. The angstrom coefficients which determined the particles size distribution increases with the increase in RHs except at the delinquent point where it decreases with the increase in RHs. The mixture was determined to have bimodal type of distribution with the dominance of fine mode particles but non-spherical.   

Keywords:Microphysical properties, optical properties, hygroscopic growth, enhancement parameters,  parameterizations.