Effect of cloud on UVA and exposure to humans

Sabburg, J. and Parisi, A. V. and Wong, J. C. F. (2001) Effect of cloud on UVA and exposure to humans. Photochemistry and Photobiology, 74 (3). pp. 412-416. ISSN 0031-8655

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Abstract

The daily autumn and winter UVA exposures and 6-minute UVA irradiance data for a Southern Hemisphere, subtropical site (Toowoomba, Australia, 27.6 S, 151.9 E) are presented. This data is used to quantify the effect of cloud on UVA using an integrated sky-camera and radiation system. Additionally, an estimate of the effect of enhanced UVA exposure on humans is made. The measurement system consisted of broadband visible-infrared and UVA sensors together with a sun tracking, wide-angle video camera. The mean daily June exposure was found to be 409 kJm-2. Under the constraints of the uncertainty of both the UVA measurement system and clear-sky model, one case of enhanced UVA irradiance was found. Three cases of cloud enhancement of daily UVA exposure, approaching clear-sky levels, were also determined using a calculated clear-sky envelope. It was also determined that for a fulltime outdoor worker, the additional UVA exposure could approach approximately that of one third of a full winter's day. For indoor workers with an outside lunch break of noon to 1 pm, the additional UVA exposure was on average 6.9 kJm-2 over three cloud enhanced days. To the authors' knowledge this is the first paper to present some evidence of cloud enhanced UVA human exposure.

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Item Type:	Article (Commonwealth Reporting Category C)
Refereed:	Yes
Item Status:	Live Archive
Additional Information:	Author's version deposited according to Publisher's requirements.
Faculty / Department / School:	Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited:	11 Oct 2007 00:48
Last Modified:	27 Sep 2016 04:48
Uncontrolled Keywords:	UVA; enhancement; cloud; solar; skin cancer; exposure
Fields of Research :	10 Technology > 1004 Medical Biotechnology > 100402 Medical Biotechnology Diagnostics (incl. Biosensors) 04 Earth Sciences > 0401 Atmospheric Sciences > 040103 Atmospheric Radiation 04 Earth Sciences > 0401 Atmospheric Sciences > 040106 Cloud Physics
Socio-Economic Objective:	E Expanding Knowledge > 97 Expanding Knowledge > 970104 Expanding Knowledge in the Earth Sciences
Identification Number or DOI:	doi: 10.1562/0031-8655(2001)074<0412:EOCOUA>2.0.CO;2
URI:	http://eprints.usq.edu.au/id/eprint/1608

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