Estimation of UV radiation long-term variability over Slovakia

Time series of the erythemal UV radiation (UVery) daily doses were reconstructed using relations between UV radiation and total ozone, global radiation and sunshine duration in period 1950 - 2008 for selected places in Slovakia. The statistical model of erythermal UV radiation daily dose created during the COST-726 action was used for reconstruction in the past. The six reconstructed time series of UVery were analysed together with the time series of the calculated cloud modification factor. Increase in the annual sums of the UVery was detected nearly at all stations. The changes in local cloud attenuation affect the trends significantly what can lead to total ozone depletion effect wrapping in the UVery time series at places with increasing cloud attenuation. Significant increase was detected in March June-July monthly doses. The increase in monthly maxima of UVery was detected at all investigated places from March to September.