Solar ultraviolet exposures at ground level in tree shade during summer in south east Queensland

Parisi, Alfio V. and Kimlin, Michael G. and Wong, Joe C. F. and Wilson, Meegan (2001) Solar ultraviolet exposures at ground level in tree shade during summer in south east Queensland. International Journal of Environmental Health Research, 11 (2). pp. 117-127. ISSN 0960-3123

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Abstract

Data is presented on the effect of the tree canopy transmittance in the visible waveband (VT), canopy width, height and height of the start of the tree canopy (CH) on the solar UV in tree shade on a horizontal plane at ground level during a Southern Hemisphere summer. Of these factors, the VT and CH have an influence on the UV irradiances in the tree shade. The shade ratios (UV in tree shade to that in full sun) for erythemal UV ranged from 0.71 to 0.42, 0.54 to 0.29 and 0.63 to 0.41 for morning, noon and afternoon respectively for the VT range of 0.4 to 1.0. Over the same VT range, the shade ratios for UVA ranged from 0.61 to 0.28, 0.50 to 0.22 and 0.49 to 0.29 for morning, noon and afternoon respectively. The UV exposures in the tree shade decreased with the VT with a marginally higher decrease in the irradiances for the UVA compared to the erythemal UV. Despite the protection by the tree shade, significant UV in the tree shade of approximately 4 MED (minimum erythemal dose) were received for the latitude in this research on a cloud free summer day on a horizontal plane over a two hour period centred about solar noon.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Depositing User: Assoc Prof Alfio Parisi
Faculty / Department / School: Historic - Faculty of Sciences - Department of Biological and Physical Sciences
Date Deposited: 11 Oct 2007 00:34
Last Modified: 14 Nov 2013 04:11
Uncontrolled Keywords: erythema; summer; tree shade; ultraviolet; UVA
Fields of Research (FOR2008): 02 Physical Sciences > 0299 Other Physical Sciences > 029999 Physical Sciences not elsewhere classified
04 Earth Sciences > 0401 Atmospheric Sciences > 040103 Atmospheric Radiation
02 Physical Sciences > 0299 Other Physical Sciences > 029904 Synchrotrons; Accelerators; Instruments and Techniques
Socio-Economic Objective (SEO2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: doi: 10.1080/09603120020047500
URI: http://eprints.usq.edu.au/id/eprint/1069

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