A one-parameter model of the spectral course of the aerosol attenuation coefficient for hazes of the surface layer of the atmosphere
N.N. Shchelkanov
V.E. Zuev Institute of Atmospheric Optics of Siberian Branch of the Russian Academy of Science, Tomsk, Russia
Keywords: atmosphere, aerosol attenuation coefficient, meteorological visibility range, model
Abstract
Most measurements of aerosol attenuation of the atmosphere are carried out in the visible and near-infrared regions of the spectrum. However, many atmospheric optics tasks require data on the spectral course of aerosol attenuation coefficients in the visible and IR regions, including the atmospheric “transparency window” 8-12 mm. In this regard, models that make it possible to calculate attenuation in the IR region based on measurements in the visible region are of great interest. A one-parameter model of the spectral course of the aerosol attenuation coefficient for the surface layer of the atmosphere is proposed. The input parameter of the model is the aerosol attenuation coefficient at a wavelength of 0.55 mm or the meteorological range of visibility S m. The model enables one to calculate aerosol attenuation coefficient in the spectral range 0.44-12 mm at meteorological visibility range S m > 8 km. The model can be used to evaluate the efficiency of different optical systems and to separate aerosol attenuation into submicron and coarse components.
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