Reflected solar radiation from horizontal, vertical and inclined surfaces: ultraviolet and visible spectral and broadband behaviour due to solar zenith angle, orientation and surface type
Article
Article Title | Reflected solar radiation from horizontal, vertical and inclined surfaces: ultraviolet and visible spectral and broadband behaviour due to solar zenith angle, orientation and surface type |
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ERA Journal ID | 2243 |
Article Category | Article |
Authors | Turner, J. (Author), Parisi, A. V. (Author) and Turnbull, D. J. (Author) |
Journal Title | Journal of Photochemistry and Photobiology, B: Biology |
Journal Citation | 92 (1), pp. 29-37 |
Number of Pages | 9 |
Year | 2008 |
Publisher | Elsevier |
Place of Publication | Amsterdam, Netherlands |
ISSN | 1011-1344 |
1873-2682 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.jphotobiol.2008.03.006 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S1011134408000754 |
Abstract | Ultraviolet (UV) radiation affects human life and UV exposure is a significant everyday factor that individuals must be aware of to ensure minimal damaging biological effects to themselves. UV exposure is affected by many complex factors. Albedo is one factor, involving reflection from flat surfaces. Albedo is defined as the ratio of reflected (upwelling) irradiance to incident (downwelling) irradiance and is generally accepted only for horizontal surfaces. Incident irradiance on a non horizontal surface from a variety of incident angles may cause the reflectivity can change. Assumptions about the reflectivity of a vertical surface are frequently made for a variety of purposes but rarely quantified. As urban structures are dominated by vertical surfaces, using albedo to estimate influence on UV exposure is limiting when incident (downwelling) irradiance is not normal to the surface. Changes to the incident angle are affected by the solar zenith angle, surface position and orientation and surface type. A new characteristic describing reflection from a surface has been used. The ratio of reflected irradiance (from any surface position of vertical, horizontal or inclined) to global (or downwelling) irradiance (RRG) has been calculated for a variety of metal building surfaces in winter time in the southern hemisphere for both UV and visible radiation spectrum, with special attention to RRG in the UV spectrum. The results show that the RRG due to a vertical surface can exceed the RRG due to a horizontal surface, at smaller solar zenith angles as well as large solar zenith angles. |
Keywords | albedo; RRG; vertical surfaces; UV radiation; visible; solar zenith angle; skin cancer; erythema |
ANZSRC Field of Research 2020 | 490102. Biological mathematics |
510299. Atomic, molecular and optical physics not elsewhere classified | |
370106. Atmospheric radiation | |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | Department of Biological and Physical Sciences |
https://research.usq.edu.au/item/9yvqz/reflected-solar-radiation-from-horizontal-vertical-and-inclined-surfaces-ultraviolet-and-visible-spectral-and-broadband-behaviour-due-to-solar-zenith-angle-orientation-and-surface-type
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