Evaluation of the cloudy sky solar UVA radiation exposures

Parisi, A. V. and Downs, N. and Turner, J. (2014) Evaluation of the cloudy sky solar UVA radiation exposures. Journal of Photochemistry and Photobiology B: Biology, 138. pp. 141-145. ISSN 1011-1344


The influence of cloud on the solar UVA (320-400 nm) exposures over five minute periods on a horizontal plane has been investigated. The first approach used cloud modification factors that were evaluated using the influence of clouds on the global solar exposures (310-2,800 nm) and a model developed to apply these to the clear sky UVA exposures to allow calculation of the five minute UVA exposures for any cloud conditions. The second approach established a relationship between the UVA and the global solar exposures. The models were developed using the first six months of data in 2012 for SZA less than or equal to 70 degrees and were applied and evaluated for the exposures in the second half of 2012. This comparison of the modelled exposures for all cloud conditions to the measured data provided an R2 of 0.8 for the cloud modification model, compared to an R2 of 0.7 for the UVA/global model. The cloud modification model provided 73% of the five minute exposures within 20% of the measured UVA exposures. This was improved to 89% of the exposures within 20% of the measured UVA exposures for the cases of cloud with the sun not obscured.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2014 Elsevier B.V. Published version deposited in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 20 Jun 2014 01:44
Last Modified: 04 Jul 2016 05:12
Uncontrolled Keywords: cloud; UVA; solar radiation; exposure; cloud modification factor; ultraviolet
Fields of Research : 11 Medical and Health Sciences > 1103 Clinical Sciences > 110304 Dermatology
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020109 Space and Solar Physics
04 Earth Sciences > 0401 Atmospheric Sciences > 040103 Atmospheric Radiation
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1016/j.jphotobiol.2014.05.012
URI: http://eprints.usq.edu.au/id/eprint/25303

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