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Spectral absorption of solar radiation by the denver brown pollution cloud

Atmospheric Environment 11(9): 829-846

Spectral absorption of solar radiation by the denver brown pollution cloud

Wideband spectral measurements of the global and direct solar flux at the surface were obtained at the Denver Trout Farm [Colorado, USA] in conjunction with the EPA [Environmental Protection Agency] Denver Brown Cloud experiment on 20 and 21 November, 1973. These measurements were analyzed by a simple variational technique to yield the increase in the rate of absorption and scattering by the Denver pollution cloud when the observed optical depth increased by approximately 0.06. The increase in heating of the atmospheric surface layer is estimated. The imaginary term of the complex refractive index of the aerosols is deduced from theoretical calculation data. Moderate wavelength resolution emission spectra of the brown cloud obtained in 1974 revealed unidentified absorption bands in the same wavelength region as the high absorption found in the wideband measurements.

Accession: 006459367

DOI: 10.1016/0004-6981(77)90045-2

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