Parisi, Alfio (1999) Quantification of the protection from solar ultraviolet radiation provided by tree shade. In: Queensland Health Commissioned Cancer Prevention Research Conference, 26 Nov 1999, Brisbane.
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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.
|Item Type:||Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)|
|Additional Information:||Conference publication consists of only the abstracts of papers presented at the conference. Abstract only posted here. No evidence of copyright restrictions.|
|Uncontrolled Keywords:||tree shade, UV, solar, skin cancer, prevention, MED, erythema|
|Fields of Research (FOR2008):||02 Physical Sciences > 0299 Other Physical Sciences > 029904 Synchrotrons; Accelerators; Instruments and Techniques|
|Subjects:||240000 Physical Sciences > 249900 Other Physical Sciences > 249903 Instruments and Techniques|
|Socio-Economic Objective (SEO2008):||UNSPECIFIED|
|Deposited On:||11 Oct 2007 10:43|
|Last Modified:||27 Jun 2012 10:46|
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