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2. Aerosol Optical Thickness

The variation in size distribution affect the spectral dependence of aerosol optical thickness, which is very important for modeling the radiative effects of aerosols in the atmosphere. In this work the aerosols optical thickness and its spectral dependence are related with Angstrom wavelength parameter a . Angstrom´s empirical expression is given as

(1)

where l is the wavelenth in microns and b is Angstrom´s turbidity coefficient.

Taking the logarithm the Angstrom wavelength exponent [Eck et al., 1999] may be computed from spectral values of t .

(2)

and a is the negative of the slope t vs l in the logarithmic scale.