Excess absorption of optical radiation in the visible and infrared

Nikolay N. Shchelkanov; Yurii A. Pkhalagov; Victor N. Uzhegov

doi:10.1117/12.337010

13 January 1999 Excess absorption of optical radiation in the visible and infrared

Nikolay N. Shchelkanov, Yurii A. Pkhalagov, Victor N. Uzhegov

Proceedings Volume 3583, Fifth International Symposium on Atmospheric and Ocean Optics; (1999) https://doi.org/10.1117/12.337010
Event: Fifth International Symposium on Atmospheric and Ocean Optics, 1998, Tomsk, Russian Federation

Abstract

Based on field data on spectral atmospheric transmission along the extended near-ground paths in an arid zone and in a region of West Siberia, excess continuous absorption of radiation in the 0.44-11.5 micrometers wavelength region has been revealed, which nonlinearly depends on the absolute air humidity. Its value, under assumption of quadratic dependence on absolute air humidity, is about 1000-1450 g ^-2cm⁵, far in excess of the continuous absorption by water vapor. The character of its spectral dependence suggests that it is related to the finely dispersed soot aerosol. The absorption coefficients obtained on the near-ground and slant paths are compared. The comparison made shows quite satisfactory agreement between them. The presence of the finely dispersed aerosol in the atmosphere is considered one of the important factors causing the anomalous absorption of optical radiation by clouds.

Citation Download Citation

Nikolay N. Shchelkanov, Yurii A. Pkhalagov, and Victor N. Uzhegov "Excess absorption of optical radiation in the visible and infrared", Proc. SPIE 3583, Fifth International Symposium on Atmospheric and Ocean Optics, (13 January 1999); https://doi.org/10.1117/12.337010

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