Atmos. Chem. Phys. Discuss., 8, 2403-2428, 2008
www.atmos-chem-phys-discuss.net/8/2403/2008/
doi:10.5194/acpd-8-2403-2008
© Author(s) 2008. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Spectral UV measurements in Austria from 1994 to 2006: investigations of short- and long-term changes
S. Simic, P. Weihs, A. Vacek, H. Kromp-Kolb, and M. Fitzka
Institute of Meteorology, University of Natural Resources and Applied Life Sciences (BOKU), Vienna, Austria

Abstract. Influences of atmospheric variability on short- and long-term changes of spectral UV irradiance measured at the Sonnblick observatory (47.03 N, 12.57 E, 3106 m) during the period from 1994 to 2006 is studied. Measurements are performed with a Brewer ozone single spectrophotometer and with a Bentham DM150 spectroradiometer (double monochromator). The influence of ozone, albedo and clouds on UV variability is evaluated separately using 10-year climatology. It is found that the effect of total ozone on short-term variability of UV irradiance at 305 nm can be more than 200% and on average more than 50%. Clouds can cause variability of 150% or more and on average 35%. Variability caused by albedo is maximum 32%. Long-term trends are investigated for the time period from 1994 to 2006 using the non-parametric Mann-Kendall trend test. Significant downwards trends (99% confidence level) were found for solar zenith angle 55° at wavelengths from 305 nm to 324 nm and CIE.

Citation: Simic, S., Weihs, P., Vacek, A., Kromp-Kolb, H., and Fitzka, M.: Spectral UV measurements in Austria from 1994 to 2006: investigations of short- and long-term changes, Atmos. Chem. Phys. Discuss., 8, 2403-2428, doi:10.5194/acpd-8-2403-2008, 2008.
 
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