Attenuation of Solar UV Radiation in the Atmosphere
太阳紫外辐射在大气中衰减的探讨

Based on analyzing observational data of solar ultraviolet radiation in Beijing area, the absorption effect of photochemical reactions in the atmosphere on solar ultraviolet radiation is carried out. Comparing to clear skies in 1990, the solar ultraviolet radiation decreased by about 21 W m-2 cloud skies in 1990, which is close to that observed by R. D. Cess et al. So, the anomalous absorption of solar radiation by clouds is basically equal to the absorption of solar actinic radiation by the substance with photochemical reactions in the atmosphere. The absorption in actinic band by all kinds of substances with photochemical reactions in the atmosphere should be considered in radiation transfer model, atmospheric chemistry model, and the climate model.