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Issue 7, 2004
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Variation of the enhanced biologically damaging solar UV due to clouds

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Abstract

The variation of the biologically damaging solar UV (UVBE) enhanced by clouds above that of clear sky UVBE has been investigated. This was undertaken for summer through to winter for SZA of 5 to 60° employing an integrated automatic cloud and spectral UV measurement system that recorded the solar UV spectra and the sky images at five minute intervals. The UVBE calculated with action spectra with higher relative effectiveness in the UVA produced the lower percentage of cloud enhanced cases. The DNA UVBE provided the highest percentage of cloud enhanced cases compared to the total number of UV scans with 2.2% cloud enhanced cases. As a comparison, the plant and fish melanoma UVBE provided the lowest percentage of cloud enhanced cases with 0.6 to 0.8% cloud enhanced cases. For the cases of cloud enhanced UVBE, the average ratio of the measured UVBE to calculated cloud free UVBE for the photokeratitis, cataracts, plant, generalized plant damage and fish melanoma action spectra was 1.21 to 1.25. In comparison, the highest value of 1.4 was for the DNA action spectrum.

Graphical abstract: Variation of the enhanced biologically damaging solar UV due to clouds

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Publication details

The article was received on 10 Feb 2004, accepted on 10 May 2004 and first published on 20 May 2004


Article type: Paper
DOI: 10.1039/B402035A
Citation: Photochem. Photobiol. Sci., 2004,3, 643-647
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    Variation of the enhanced biologically damaging solar UV due to clouds

    A. V. Parisi and N. Downs, Photochem. Photobiol. Sci., 2004, 3, 643
    DOI: 10.1039/B402035A

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