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The Austrian UVA-Network.

Alois W Schmalwieser1, Barbara Klotz2, Michael Schwarzmann2

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Long-term monitoring of ultraviolet-A (UVA) radiation in Austria reveals significant findings. UVA levels increase with altitude and are higher in summer due to reduced cloudiness, with winter radiation at high altitudes being double that of lower elevations.

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Area of Science:

  • Atmospheric science
  • Environmental monitoring
  • Solar radiation physics

Background:

  • Ultraviolet-A (UVA) radiation is a crucial environmental factor, yet continuous long-term monitoring is scarce.
  • Existing UV monitoring networks offer opportunities for upgrading with UVA broadband instrumentation.
  • Understanding UVA radiation patterns is vital for environmental and health studies.

Purpose of the Study:

  • To establish and describe a long-term UVA radiation monitoring system in Austria.
  • To present and analyze global and diffuse UVA irradiance measurements.
  • To investigate the influence of altitude, season, and cloudiness on UVA radiation.

Main Methods:

  • Upgrading three existing UV monitoring stations with UVA broadband instruments.
  • Measuring both global and diffuse UVA irradiance in parallel at each station.
  • Implementing rigorous calibration, quality assurance, and quality control procedures.

Main Results:

  • Presented global and diffuse UVA measurements spanning up to five years.
  • Observed a clear annual course in UVA radiation levels.
  • Quantified an increase in UVA radiation of 8-9% per 1000m altitude.
  • Noted higher UVA radiation in the first half of the year compared to the second, attributed to cloudiness.
  • Found comparable summer UVA radiant exposure in Vienna and Mt. Gerlitzen due to cloud cover, but winter exposure at Mt. Gerlitzen was double that of Vienna.

Conclusions:

  • The upgraded network provides valuable long-term UVA data.
  • Altitude and seasonal cloudiness significantly impact UVA radiation levels.
  • The findings enhance our understanding of UVA radiation dynamics in alpine and urban environments.