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Related Experiment Videos

UV Index on tilted surfaces.

A R Esteve1, M J Marín, J A Martínez-Lozano

  • 1Solar Radiation Group, University of Valencia, Spain.

Photochemistry and Photobiology
|January 6, 2007
PubMed
Summary
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Solar ultraviolet erythemal irradiance (UVER) varies by surface orientation. South-facing surfaces receive the most UVER, while north-facing surfaces receive the least, impacting accumulated erythemal dosage.

Area of Science:

  • Atmospheric science
  • Solar radiation research
  • Erythemal irradiance studies

Background:

  • Solar ultraviolet erythemal irradiance (UVER) is crucial for understanding UV exposure and its biological effects.
  • Previous studies have focused on horizontal surfaces, but orientation significantly influences UV irradiance.
  • Valencia, Spain, offers a specific geographical context for studying solar radiation at 39.5 degrees N latitude.

Purpose of the Study:

  • To investigate the impact of different surface orientations on solar ultraviolet erythemal irradiance (UVER).
  • To compare experimental UVER data with the SMARTS2.9 model.
  • To determine the accumulated erythemal dosage for various orientations and phototypes.

Main Methods:

  • A specialized platform was designed to rotate radiometers through 90-degree intervals.

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  • Measurements were taken on clear and partially cloudy days with varying turbidity.
  • Data was collected near the summer and winter solstices and equinoxes.

    • Main Results:

    • UVER peaked around solar noon for north and south orientations, and approximately one hour before/after noon for east and west.
    • South orientation showed higher irradiance than horizontal, while north showed less; east and west had opposite performance to horizontal.
    • The SMARTS2.9 model frequently overestimated experimental UVER data.
    • Maximum UV Index was consistently higher for south-facing planes compared to north.
    • Accumulated erythemal dosage decreased significantly on north (37%), east (20%), and west (15%) orientations compared to horizontal, with only a 6% decrease on south.

    Conclusions:

    • Surface orientation critically affects solar UVER and accumulated erythemal dosage.
    • South-facing surfaces maximize UVER, while north-facing surfaces minimize it.
    • The SMARTS2.9 model requires refinement for accurate UVER predictions across different orientations.