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Theoretical and Applied Climatology

, Volume 110, Issue 4, pp 585–593 | Cite as

Trends in spectral UV radiation from long-term measurements at Hoher Sonnblick, Austria

  • M. Fitzka
  • S. Simic
  • J. Hadzimustafic
Special Issue

Abstract

High-quality long-term records of spectral UV irradiance from the Network for the Detection of Atmospheric Composition Change-affiliated Bentham spectroradiometer at the high-mountain site Hoher Sonnblick (47.05° N, 12.95° E, 3,106 m above sea level) from the period 1997–2011 have been investigated for the existence of trends. Throughout the year, significant upward trends are found at wavelengths of 315 nm and longer. The magnitudes at 315 nm range from +9.3 ± 4.5 %/dec at 45° solar zenith angle (SZA) to +14.2 ± 3.7 %/dec at SZA 65° for all-sky conditions. The trend estimates at 305 nm are considerably smaller and less significant, yielding between +5.1 ± 6.5 and +7.9 ± 7.3 %/dec, depending on SZA. Seasonally, the largest trends are found during winter and spring. Total ozone has significantly increased by year-round +1.9 ± 1.3 %/dec since 1997 and therefore cannot explain these significant increases. They are rather attributed to decreases in total cloud cover and aerosol optical depth.

Keywords

Ozone Aerosol Optical Depth Total Ozone Solar Zenith Angle Stratospheric Ozone 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This work has been funded by the Austrian Federal Ministry for Agriculture and Forestry, Environment and Water Management within the project “Long-term measurements of total ozone and high-resolution spectral UV radiation at Hoher Sonnblick and Groß-Enzersdorf”.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  1. 1.Institute of MeteorologyUniversity of Natural Resources and Life SciencesViennaAustria

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