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An assessment of the global UV solar radiation under various sky conditions in Maceió-Northeastern Brazil

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  • Porfirio, Anthony Carlos Silva
  • De Souza, José Leonaldo
  • Lyra, Gustavo Bastos
  • Maringolo Lemes, Marco Antonio

Abstract

The first observations of UV (290–400 nm) ever made at an agro-meteorological/radiometric station located in the metropolitan region of Maceió (9°28′S, 35°49′W, 127 m), Northeast Brazil, during 2008 are reported in this work. Solar UV radiation variability in different time scales and its fractional composition in the global solar radiation (G), that is, FUV = UV/G is investigated under different sky conditions. The maximum daily UV solar irradiation (HUVd) was 0.85 MJ m−2 and the annual average 0.55 MJ m−2. It was noticed that the largest contribution to the annual variation of the daily totals of UV are attributed to cloudiness than seasonality. Under partially cloudy sky, multi reflection was responsible for an increase of 11.1 and 18.8% in the UV levels, relatively to clear days. FUV is inversely proportional to the global atmospheric transmittance (KT); the daily percentage variation of FUV was in the range of 2.33–2.95% in clear days and from 2.60 to 3.59% in cloudy days, with the annual daily average value of 2.8%. Linear empirical relations between the UV and G components for hourly and daily intervals under different KT intervals were established and recommended, with the coefficient of determination (R2) generally above 0.91.

Suggested Citation

  • Porfirio, Anthony Carlos Silva & De Souza, José Leonaldo & Lyra, Gustavo Bastos & Maringolo Lemes, Marco Antonio, 2012. "An assessment of the global UV solar radiation under various sky conditions in Maceió-Northeastern Brazil," Energy, Elsevier, vol. 44(1), pages 584-592.
    • Handle: RePEc:eee:energy:v:44:y:2012:i:1:p:584-592
    DOI: 10.1016/j.energy.2012.05.042
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    References listed on IDEAS

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    2. Wang, Lunche & Gong, Wei & Hu, Bo & Feng, Lan & Lin, Aiwen & Zhang, Ming, 2014. "Long-term variations of ultraviolet radiation in China from measurements and model reconstructions," Energy, Elsevier, vol. 78(C), pages 928-938.
    3. Wang, Lunche & Gong, Wei & Luo, Ming & Wang, Wenfeng & Hu, Bo & Zhang, Ming, 2015. "Comparison of different UV models for cloud effect study," Energy, Elsevier, vol. 80(C), pages 695-705.
    4. Ghoneim, Adel A. & Kadad, Ibrahim M. & Altouq, Majida S., 2013. "Statistical analysis of solar UVB and global radiation in Kuwait," Energy, Elsevier, vol. 60(C), pages 23-34.

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