Determination of Angstrom’s turbidity coefficient over Thailand

Optical properties of inorganic suspended solids and their influence on ocean colour remote sensing in highly turbid coastal waters

“…Aas and Korsbø (1997) showed that self-shading errors in coastal waters are equal to or less than those found in Gordon and Ding's simulation. Regarding self-shading correction, a ratio of diffuse to total downward spectral irradiance was used in a table presented in an earlier report (Baker and Smith 1990), for which we assumed a 'continental' aerosol type and a visibility of 10 km (Janjai et al 2003), respectively. The upward radiance just below the surface L u (0 − ,λ) and the downward irradiance just below the surface E d (0 − ,λ) were extrapolated from the profile measurements of L u (z,λ) and E d (z,λ), respectively.…”

Ultraviolet-B solar irradiance, the influence of Ångström turbidity, at Central Spain

“…As these instruments are expensive and scarce, turbidity is estimated from broadband irradiance measurements. During the past years, some researchers have used direct beam irradiance to obtain turbidity (Louche et al, 1987;Gueymard and Vignola, 1998;Pedró s et al, 1999;Martinez-Lozano et al, 1998;Tadros et al, 2002;Janjai et al, 2003 single scattering albedo radiation at all wavelengths. The attenuation of solar beam varies with the gases and aerosols, and the total amount of water vapour in the atmosphere in the vertical direction is variable and depends on the instantaneous local conditions.…”

Classification of Aerosol Types over Ghardaia, Algeria, Based on MODIS Data

“…The spectral dependence of AOT is used in this work to compute the Angstrom Exponent α values. A spectrally-averaged value of this exponent, which contains information about size of aerosols, can be obtained by fitting the Angstrom's formula [15], generally known as Angstrom's turbidity formula given by [16]:…”