Comparison between seasons of the ultraviolet environment in the shade of trees in Australia

Citation
Av. Parisi et al., Comparison between seasons of the ultraviolet environment in the shade of trees in Australia, PHOTODERM P, 17(2), 2001, pp. 55-59
Citations number
18
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Dermatology
Journal title
PHOTODERMATOLOGY PHOTOIMMUNOLOGY & PHOTOMEDICINE
ISSN journal
0905-4383 → ACNP
Volume
17
Issue
2
Year of publication
2001
Pages
55 - 59
Database
ISI
SICI code
0905-4383(200104)17:2<55:CBSOTU>2.0.ZU;2-T
Abstract
Background/Purpose: This paper has considered the erythemal UV (UVery), UVA and visible irradiances in the shade of Australian trees for each season a t a sub-tropical southern hemisphere site, Methods: The irradiances in tree shade have been measured with radiometers as a percentage of the irradiances in the sun for each season of the year. Results: Although the solar irradiances are lower in winter, the percentage s of the UV in tree shade compared to the UV in full sun are marginally hig her (by up to 7%) in the winter compared to summer, The range of percentage s for UVery was up to double that of the percentages of the visible waveban d. The percentages for UVery were also higher than for the UVA waveband, Th e percentages of the irradiances in the tree shade compared to full sun are 8-14% lower at noon compared to the morning and afternoon for the UVery wa veband. The ratio of UVA to UVery, is lower in the tree shade compared to t he full sun. Conclusions: The UVA to UVery ratio is expected to be even lower in the tre e shade as a result of ozone depletion. This, combined with the visible irr adiances in the tree shade not being a reliable indication of the biologica lly damaging UV irradiances, has consequences for public health and skin ca ncer prevention.