Vol. 12, issue 03, article # 17
pdf Nesmelova L. I., Pkhalagov Yu. A., Rodimova O. B., Tvorogov S. D., Uzhegov V. N., Shchelkanov N. N. On the nature of anomalous absorption of short-wave radiation by the atmosphere. // Atmospheric and oceanic optics. 1999. V. 12. No. 03. P. 278-284.Copy the reference to clipboard
Abstract:
Continuous attenuation of radiation in the region 0.44–3.97 μm having a positive linear relation to the absolute air humidity has been revealed based on the measurements of atmospheric spectral transmission along the extended horizontal near-ground paths. The comparison made among the coefficients of continuous attenuation at the near-ground and slant paths shows their satisfactory agreement. To elucidate the physical nature of the attenuation under discussion, the line-by-line absorption coefficients of the Н2О–N2 mixture in the spectral region of 9450–9475 cm–1 were calculated using some empirical and theoretical expressions for the line shape. It is shown that the measured coefficients of the continuous attenuation being about 0.02–0.03 g–1cm2 significantly exceed the calculated level of the spectroscopic continuum. The form of their spectral dependence points to some connection between the atmospheric continuum and finely dispersed soot aerosol. It is expected that the presence of the finely dispersed soot aerosol in the atmosphere may be one of the important factors causing the anomalous absorption of optical radiation by clouds.