Diffuse component of solar ultraviolet radiation in tree shade

A. V. Parisi*, M. G. Kimlin, J. C.F. Wong, M. Wilson

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

55 Citations (Scopus)

Abstract

The first set of quantitative data of diffuse erythemal UV and UV-A radiation in tree shade at a sub-tropical Southern Hemisphere latitude is presented. Over the summer, approximately 60% of the erythemal UV radiation in tree shade is due to the diffuse component. Similarly, approximately 56% of the UV-A radiation in tree shade is due to the diffuse component. In tree shade these diffuse UV percentages are relatively constant from the morning to noon to afternoon periods. In comparison, in full sun, there is a decrease in the percentage of diffuse UV from morning to noon to afternoon. The exposures to diffuse UV on a horizontal plane in tree shade between 9:00 EST and 15:00 EST are of the order of 4 MED (minimum erythemal dose)and 14 J cm-2 for erythemal UV and UV-A, respectively. The high diffuse UV component in the shade may result in high UV exposures not only to unprotected parts of the body on a horizontal plane, but also in equally high UV irradiances to parts of the body, including the eyes and face, that are not UV protected. (C) 2000 Elsevier Science S.A. All rights reserved.

Original languageEnglish
Pages (from-to)116-120
Number of pages5
JournalJournal of Photochemistry and Photobiology B: Biology
Volume54
Issue number2-3
DOIs
Publication statusPublished - 29 Feb 2000
Externally publishedYes

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