Retrival of Atmosph Eric Aerosol Optical and Microphysical Parameters from Ground Base Passive Remote Sensing Measurement over Addis Ababa

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Addis Ababa University


Aerosol optical depth is determined from measurements of atmospheric effective spectral transmission, for clear-sky days on May 21, 2008 and May 23, 2008, at Addis Ababa (9° 1′ 48″ N, 38° 44′ 24″ E) carried out using pyrheliometer, which we constructed in department of physics at AAU. It has effective discrete optical channels in the range between 0.699mm and 0.753mm. With in framework of Mie theory and non-linear inversion method, column integrated effective optical and microphysical parameters are retrieved. The effective refractive index, temporal variation related to atmospheric particle size distribution, and modeling the effect of water vapor implies that, atmospheric aerosols have chemically distinct compositions due to their different sources and the hygroscopic growth is facilitated by chemical alterations. Removal processes of particles are more efficient when the aerosol size increases. Retrieved real part of effective refractive index ranges between 1.53 and 1.59 while computed single scattering albedo ( 0 w ) ranges between 0.98 and 0.99. This is indicating that dust is by far the dominant aerosol component in Addis Ababa



Remote Sensing Measurement over Addis Ababa