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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 (0.40μm to 0.75μm) 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.