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The influence of variability of atmospheric parameters on short- andlong-term changes of spectral UV irradiance measured at the Sonnblickobservatory (47.03° N, 12.57° E, 3106 m) during the period from 1994 to 2006is studied. Measurements were performed with the Brewer #093single-monochromator spectrophotometer and with a Bentham DM 150spectroradiometer (double-monochromator).  The influence of ozone, albedo, snowline and clouds on UV variability isevaluated for each parameter separately using 10-year climatology. It isfound that the effect of total ozone on short-term variability of UVirradiance at 305 nm can be more than 200% and on average more than50%. Clouds can cause variability of 150% or more and on average35%. Variability caused by albedo reaches a maximum of 32% in April(6% on average). In summer and autumn, total ozone and clouds stronglyinfluence the variability of UV radiation, whereas in winter and springozone has the more pronounced effect. A decrease in snowline height from3000 m to 800 m a.s.l. enhances the UV irradiance by a factor of 1.24 forclear sky conditions and by a factor of 1.7 for 8/8 cloud cover.  Long-term trends are investigated for the time period from 1994 to 2006based on clear-sky measurements, using the non-parametric Mann-Kendall trendtest. Significant downward trends (99% confidence level) are found forsolar zenith angle 55° at wavelengths from 305 nm to 324 nm anderythemally weighted irradiance according to CIE, which are caused by anincrease in sunshine duration during periods of high total column ozone.Significant trends (90% confidence level) were also found for othercombinations of wavelength and SZA

Spectral UV measurements in Austria from 1994 to 2006: investigations of short- and long-term changes