The angular distributions of ultraviolet spectral irradiance at different solar elevation angles under clear sky conditions

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• 作者：Yan Liu ; LiWen Hu ; Fang Wang ; YanYan Gao…
• 关键词：Ultraviolet radiation ; Solar elevation angle (SEA) ; Inclined angles ; Erythemal ; Vitamin D
• 刊名：International Journal of Biometeorology
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：60
• 期：1
• 页码：63-72
• 全文大小：456 KB
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• 作者单位：Yan Liu (1) (2)
  LiWen Hu (1)
  Fang Wang (1)
  YanYan Gao (1)
  Yang Zheng (1)
  Yu Wang (1)
  Yang Liu (1)
  
  1. Department of Environmental Health, School fo Public Health, China Medical University, Shenyang, China
  2. Department of Biomedical Engineering, China Medical University, Shenyang, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Life Sciences
  Animal Physiology
  Plant Physiology
  Environmental Medicine/Environmental Psychology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1254

文摘

To investigate the angular distributions of UVA, UVB, and effective UV for erythema and vitamin D (vitD) synthesis, the UV spectral irradiances were measured at ten inclined angles (from 0° to 90°) and seven azimuths (from 0° to 180°) at solar elevation angle (SEA) that ranged from 18.8° to 80° in Shanghai (31.22° N, 121.55° E) under clear sky and the albedo of ground was 0.1. The results demonstrated that in the mean azimuths and with the back to the sun, the UVA, UVB, and erythemally and vitD-weighted irradiances increased with the inclined angles and an increase in SEA. When facing toward the sun at 0°–60° inclined angles, the UVA first increased and then decreased with an increase in SEA; at other inclined angles, the UVA increased with SEA. At 0°–40° inclined angles, the UVB and erythemally and vitD-weighted irradiances first increased and then decreased with an increase in SEA, and their maximums were achieved at SEA 68.7°; at other inclined angles, the above three irradiances increased with an increase in SEA. The maximum UVA, UVB, and erythemally and vitD-weighted irradiances were achieved at an 80° inclined angle at SEA 80° (the highest in our measurements); the cumulative exposure of the half day achieved the maximum at a 60° inclined angle, but not on the horizontal. This study provides support for the assessment of human skin sun exposure.