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

Parisi, Alfio V., Kimlin, Michael G., Wong, Joe C., & 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.

Abstract

Data are 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 0.4-1.0. 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 2-h period centred about solar noon.

Impact and interest:

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ID Code: 8149
Item Type: Journal Article
Refereed: Yes
Additional Information: For more information, please refer to the journal's website (see hypertext link) or contact the author.
Author contact details: parisi@usq.edu.au
Keywords: UV, UVA, erythemal UV, sun exposure
ISSN: 0960-3123
Divisions: Current > Research Centres > Australian Centre for Philanthropy and Nonprofit Studies
Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2001 Taylor & Francis
Deposited On: 20 Jun 2007 00:00
Last Modified: 25 Sep 2013 12:39

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