Abstract
ABSTRACT Spectral ultraviolet measurements in the wavelength range 290 to 325 nm made at Sodankyla (67.4N , 26.6E) in 1990- 1992 were used to study the effects of surface albedo, atmospheric total ozone and atmospheric aerosol content on UVirradiance on the surface of the Earth. Clear sky observations with optical air masses 1 .4 and 2.0 were used in theanalysis. The annual course of surface albedo between 0.1 to 0.8 was found to be responsible for a change of 10% in irradiance at 325nm,but no effect was seen at lower wavelengths or in Cffi-weighted integrated values.The total ozone content was found to be the main factor contributing to changes in surface UV irradiance, however, with a distinct dependence on wavelength. Changes in the total atmospheric aerosol contents after the eruptio of Mount Pinatubo in June 1991 were observed in pyranometer data time series. However these data failed to provide information for any assessment of the effect of aerosols on UV irradiance. The need for proper turbidity measurements became
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