Parameterizations for the absorption of solar radiation by water vapor and ozone.

Details Parameterizations for the absorption of solar radiation by water vapor and ozone. Parameterizations for the absorption of solar radiation by water vapor and ozone.

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jats...53.1203c&link_type=abstract

Journal of Atmospheric Science, Vol. 53, No. 8, p. 1203 - 1208

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Earth Atmosphere: Solar Uv Radiation, Earth Atmosphere: Photochemistry, Earth Atmosphere: Ozone

Scientific paper

Ozone absorbs solar radiation in the UV and visible wavelengths, λ < 0.7 μm. In the photosynthetically active radiation (PAR) band (0.4 μm < λ < 0.7 μm), solar radiation reaching the surface is critical in the biosphere-atmosphere interaction. In the UV-A band (0.32 μm < λ < 0.40 μm), the atmosphere is nearly transparent, and solar radiation can freely penetrate to the surface. In the UV-B (0.28 μm < λ < 0.32 μm) and UV-C (0.10 μm < λ < 0.28 μm) bands, most of the solar radiation is absorbed in the middle atmosphere, which provides energy for photochemical reactions. The ozone absorption coefficient varies by several orders of magnitude, but smoothly, with wavelengths. In order to enhance the speed of computation, Chou (1992) parameterized the absorption of UV and visible radiation by grouping the spectrum into four bands. The PAR and UV-A bands were combined, and the fluxes in these two bands could not be separately computed. Sections of the UV-B and UV-C bands were also combined. This spectral grouping imposes difficulties in the studies of photochemical processes in the middle atmosphere and the biosphere-atmosphere interactions at the surface. To avoid these difficulties, the authors divide the UV and visible spectrum into eight bands so that solar fluxes in the PAR, UV-A, UV-B, and UV-C can be separately computed.

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