Quantification of the protection from solar ultraviolet radiation provided by tree shade
Paper
Paper/Presentation Title | Quantification of the protection from solar ultraviolet radiation provided by tree shade |
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Presentation Type | Paper |
Authors | |
Author | Parisi, Alfio |
Journal or Proceedings Title | Queensland Health Commissioned Cancer Prevention Research |
Number of Pages | 1 |
Year | 1999 |
Place of Publication | Brisbane |
Conference/Event | Queensland Health Commissioned Cancer Prevention Research Conference (1999) |
Event Details | Queensland Health Commissioned Cancer Prevention Research Conference (1999) Event Date 26 Nov 1999 Event Location Brisbane, Australia |
Abstract | The effect of tree parameters on the solar erythemal UV and UVA in tree shade on a horizontal plane at ground level during a Southern Hemisphere summer was measured. The parameters investigated were tree canopy transmission in the visible waveband (VT), tree canopy width, tree height and height of the start of the tree canopy (CH). Of these factors, the VT and CH have an influence on the UV irradiances in the tree shade with the others not having any significant effect. The shade ratios (defined as the ratio of the UV in the 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. 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. The spectral shade ratio decreased with increasing wavelength. For the sample of trees investigated, the decrease in the spectral shade ratio was approximately 42% at 400 nm compared to the shade ratio at 300 nm. 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. |
Keywords | tree shade, UV, solar, skin cancer, prevention, MED, erythema |
ANZSRC Field of Research 2020 | 511099. Synchrotrons and accelerators not elsewhere classified |
Public Notes | Conference publication consists of only the abstracts of papers presented at the conference. Abstract only posted here. No evidence of copyright restrictions. |
Byline Affiliations | Centre for Astronomy, Solar Radiation and Climate |
https://research.usq.edu.au/item/9xxx4/quantification-of-the-protection-from-solar-ultraviolet-radiation-provided-by-tree-shade
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