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Home  >  Volume 21 (2012)

Radiative Forcing of Saharan Aerosols in the Visible Region by B. I. Tijjani and **R. S. Sa’id Volume 21 (July, 2012), pp 163 – 172
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We study the aerosol radiative forcing (RF) at visible wavelengths (0.40 to

0.75) and relative humidity (RH) 0, 50, 70, 80, 90, 95, 98, and 99% using data from

the Optical Properties of Aerosol and Clouds software. The primary influence on direct

radiative forcing by aerosols are its wavelength dependence scattering, absorption and

extinction coefficients, asymmetric parameter, single scattering albedo and other optical

parameters which also depend strongly on relative humidity (RH). The dependence of

optical depth on wavelengths is quantified in terms of Angstrom exponent, which

provides information on the sizes of particles that are dominant in contributing to the

optical depths and the RFs. In terms of these parameters, Saharan aerosols were

analysed in this paper and several findings were determined. One of the finding showed

that the Angstrom exponent increases from 0.0466 to 0.3395 as a result of hygroscopic

growth and also that, increase in RH has caused mode size growth. The analysis further

shows that these aerosols have Junge type of size distributions and are dominated by

coarse mode particles distribution.