Comparison of the spectral biologically effective solar ultraviolet in adjacent tree shade and sun

Parisi, Alfio and Kimlin, Michael G. (1999) Comparison of the spectral biologically effective solar ultraviolet in adjacent tree shade and sun. Physics in Medicine and Biology, 44 (8). pp. 2071-2080. ISSN 0031-9155

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Abstract

[Abstract]: The solar spectral UVR irradiances in tree shade and sunlight have been measured in a sub-tropical Southern Hemisphere summer. The spectral data allowed the UVB and UVA irradiances and the biologically effective irradiances to be calculated for different harmful biological processes to human skin and eyes. The average of the ratio of the UVA to UVB irradiances was lower by 26% in the shade compared to the same ratio in the sun. The spectral shade ratio calculated as the ratio of the spectral biologically effective irradiances in the shade to those in the adjacent sun decreased with increasing wavelength for all of the trees. The decrease in the shade ratio was approximately 42% at 400 nm compared to the shade ratio at 300 nm. Despite the UVR protection provided by tree shade, the erythemal UVR exposure received in one hour in the tree shade exceeded the occupational limit for UVR 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.
Depositing User: Assoc Prof Alfio Parisi
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 11 Oct 2007 00:35
Last Modified: 02 Jul 2013 22:36
Uncontrolled Keywords: UV, solar, tree, shade, erythem
Fields of Research (FOR2008): 02 Physical Sciences > 0299 Other Physical Sciences > 029999 Physical Sciences not elsewhere classified
02 Physical Sciences > 0299 Other Physical Sciences > 029904 Synchrotrons; Accelerators; Instruments and Techniques
04 Earth Sciences > 0401 Atmospheric Sciences > 040103 Atmospheric Radiation
URI: http://eprints.usq.edu.au/id/eprint/1106

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