PMID: 9188276Jun 1, 1997Paper

Modification of global erythemally effective irradiance by clouds

Photochemistry and Photobiology
S ThielH K Seidlitz

Abstract

The role clouds play in the modification of global radiation is still a major uncertainty in the risk assessment of UV effects on ecological systems and human health. This study presents cloud transmission data obtained from measurements with Robertson-Berger meters and simultaneous cloud observations. The global transmission of erythemally weighted irradiance depends strongly on cloud amount and can be described by a cubic function. The comparison with results derived from long-term records of total global irradiance indicates no statistically significant difference between the attenuation of erythemal and total global radiation. The large variance of data results from lumping together data from different cloud types. Classification of data according to cloud forms yields a more satisfactory fit. The coefficient of the cubic term characterizes the ability of various cloud forms to attenuate UV radiation. It varies between 0.4 for high clouds and approximately 1.0 for cumulonimbus. This attenuation parameter allows a quantitative description of the cloud influence on irradiance and therefore a more accurate risk assessment.

References

Dec 1, 1976·Photochemistry and Photobiology·D S Berger
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Nov 20, 1994·Applied Optics·G SeckmeyerE Thomalla

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Citations

Jul 17, 2004·International Journal of Biometeorology·A V Parisi, N Downs
May 26, 2007·International Journal of Biometeorology·A V ParisiP K Dunn
Sep 6, 2001·Journal of Photochemistry and Photobiology. B, Biology·J ReuderP Koepke
Nov 4, 1998·Journal of Photochemistry and Photobiology. B, Biology·R AráozD P Häder
Mar 24, 2010·Journal of Photochemistry and Photobiology. B, Biology·Alfio V ParisiJoanna Turner
Dec 7, 2006·Journal of Cosmetic Dermatology·Brian L Diffey
May 27, 2006·Photochemistry and Photobiology·Alejandro RosalesJorge O Tocho
Nov 10, 2021·Environmental Science. Processes & Impacts·Michelle G Nevins, Jennifer N Apell

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