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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/47128

Title: Colorimetric analysis of outdoor illumination across varieties of atmospheric conditions
Authors: Peyvandi, Shahram
Hernández Andrés, Javier
Olmo Reyes, Francisco Javier
Nieves Gómez, Juan Luis
Romero Mora, Francisco Javier
Issue Date: 2016
Abstract: Solar illumination at ground level is subject to a good deal of change in spectral and colorimetric properties. With an aim of understanding the influence of atmospheric components and phases of daylight on colorimetric specifications of downward radiation, more than 5,600,000 spectral irradiance functions of daylight, sunlight, and skylight were simulated by the radiative transfer code, SBDART [Bull. Am. Meteorol. Soc. 79, 2101 (1998).], under the atmospheric conditions of clear sky without aerosol particles, clear sky with aerosol particles, and overcast sky. The interquartile range of the correlated color temperatures (CCT) for daylight indicated values from 5712 to 7757 K among the three atmospheric conditions. A minimum CCT of ∼3600 K was found for daylight when aerosol particles are present in the atmosphere. Our analysis indicated that hemispheric day-light with CCT less than 3600 K may be observed in rare conditions in which the level of aerosol is high in the atmosphere. In an atmosphere with aerosol particles, we also found that the chromaticity of daylight may shift along the green–purple direction of the Planckian locus, with a magnitude depending on the spectral extinction by aerosol particles and the amount of water vapor in the atmosphere. The data analysis showed that an extremely high value of CCT, in an atmosphere without aerosol particles, for daylight and skylight at low sun, is mainly due to the effect of Chappuis absorption band of ozone at ∼600 nm. In this paper, we compare our data with well-known observations from previous research, including the ones used by the CIE to define natural daylight illuminants.
Sponsorship: Andalusian Regional Government (P12-RNM-2409); Spanish Ministry of Science and Technology (CGL2013-45410-R); EU via the ACTRIS project (EU INFRA-2010-1.1.16-262254); Spanish Ministry of Economy and Competitiveness (DPI2011-23202).
Publisher: Optical Society of America
Description: © 2016 [year] Optical Society of America.]. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.
Keywords: Colorimetry
Measurement
Atmospheric optics
URI: http://hdl.handle.net/10481/47128
ISSN: 1084-7529
1520-8532
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Peyvandi, S.; et al. Colorimetric analysis of outdoor illumination across varieties of atmospheric conditions. Journal of the Optical Society of America A, 33(6): 1049-1059 (2016). [http://hdl.handle.net/10481/47128]
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