Influence of high levels of cloud cover on vitamin D effective and erythemal solar UV irradiances
Article
Article Title | Influence of high levels of cloud cover on vitamin D effective and erythemal solar UV irradiances |
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ERA Journal ID | 1487 |
Article Category | Article |
Authors | Parisi, Alfio V., Turnbull, David J. and Downs, Nathan J. |
Journal Title | Photochemical and Photobiological Sciences |
Journal Citation | 11 (12), pp. 1855-1859 |
Number of Pages | 5 |
Year | 2012 |
Place of Publication | Cambridge, United Kingdom |
ISSN | 1474-905X |
1474-9092 | |
Digital Object Identifier (DOI) | https://doi.org/10.1039/c2pp25160d |
Web Address (URL) | http://pubs.rsc.org/en/Content/ArticleLanding/2012/PP/c2pp25160d |
Abstract | The solar irradiances for the initiation of vitamin D synthesis (UVD3) have been measured concurrently with the amount of cloud cover to investigate the influence of high cloud cover fraction. The cases of 6.5 and more octa cloud cover were considered for five solar zenith angle (SZA) ranges up to 80o. For each of the SZA ranges, the UVD3 reduced due to the high cloud cover. The average of the ratios of the UVD3 irradiances on a cloudy day to those on a clear day with the corresponding ozone and SZA are 0.71 for the 6.5-7.5 octa cloud and 0.45 for the more than 7.5 octa cloud ranges. The exposure times necessary to receive 1/3 MED to a horizontal plane were found to increase as the amount of cloud cover increased. For each cloud cover category, the range of values increased with cloud cover and with SZA. This research shows that the current public recommendations on the times of solar UV exposures required to produce adequate vitamin D are inappropriate for situations of more than 6.5 octa cloud. |
Keywords | cloud; vitamin D; UV; octa |
ANZSRC Field of Research 2020 | 519999. Other physical sciences not elsewhere classified |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | Department of Biological and Physical Sciences |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q1987/influence-of-high-levels-of-cloud-cover-on-vitamin-d-effective-and-erythemal-solar-uv-irradiances
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