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Volume 8, issue 20 | Copyright

Special issue: One century of solar ultraviolet research

Atmos. Chem. Phys., 8, 6309-6323, 2008
https://doi.org/10.5194/acp-8-6309-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

  31 Oct 2008

31 Oct 2008

Reconstruction of erythemal UV-doses for two stations in Austria: a comparison between alpine and urban regions

H. E. Rieder1,2,*, F. Holawe2, S. Simic1, M. Blumthaler3, J. W. Krzyścin4, J. E. Wagner1, A. W. Schmalwieser5, and P. Weihs1 H. E. Rieder et al.
  • 1Institute for Meteorology, University of Natural Resources and Applied Life Sciences (BOKU), Vienna, Austria
  • 2Institute for Geography and Regional Research, University of Vienna, Vienna, Austria
  • 3Division for Biomedical Physics, Innsbruck Medical University, Innsbruck, Austria
  • 4Institute of Geophysics, Polish Academy of Sciences, Warsaw, Poland
  • 5Institute of Medical Physics and Biostatistics, University of Veterinary Medicine Vienna, Vienna, Austria
  • *now at: Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland

Abstract. The aim of this study is the reconstruction of past UV-doses for two stations in Austria, Hoher Sonnblick and Vienna, using a physical radiation transfer model. The method uses the modeled UV-dose under clear-sky conditions, cloud modification factors and a correction factor as input variables. To identify the influence of temporal resolution of input data and modification factors, an ensemble of four different modelling approaches was calculated, each with hourly or daily resolution. This is especially important because we found no other study describing the influence of the temporal resolution of input data on model performance. Following the results of the statistical analysis of the evaluation period the model with the highest temporal resolution (HMC) was chosen for the reconstruction of UV-doses. A good agreement between modelled and measured values of erythemally effective UV-doses was found at both stations. In relation to the reference period 1976–1985 an increase in the erythemal UV-dose in Vienna of 11% is visible in the period 1986–1995 and an increase of 17% in the period 1996–2005 can be seen. At Hoher Sonnblick the corresponding increase is 2% and 9%. For the different seasons the strongest increase in erythemal UV-dose has been found for winter and spring season at both stations. Further the influences of total ozone and cloudiness on changes in erythemal UV-doses were analyzed. This analysis showed for both stations, that changes in total ozone had a larger influence on erythemal UV-doses than changes in cloudiness.

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