Retrival Of Atmosph Eric Aerosol Optical And Microphysical Parameters From Ground Base Passive Remote Sensing Measurement Over Addis Ababa

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

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