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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 44, Iss. 27 — Sep. 20, 2005
  • pp: 5723–5736

Simulating colors of clear and partly cloudy skies

Stanley David Gedzelman  »View Author Affiliations


Applied Optics, Vol. 44, Issue 27, pp. 5723-5736 (2005)
http://dx.doi.org/10.1364/AO.44.005723


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Abstract

A model (SKYCOLOR) is developed that simulates the light and color of the sky and open cloud decks in the vertical plane including the Sun and the observer and animates the changes as the Sun goes down. Model skylight consists of sunbeams that are scattered toward the observer, but depleted by scattering and absorption in the Chappuis bands of ozone. SKYCOLOR includes the Earth’s curvature, atmospheric refraction, cloud shadows, and solar eclipses. Scattering is given a wavelength (λ) dependence of λ−4 for air molecules (Rayleigh scattering), λ−1 for tropospheric aerosols, and λ+1 for volcanic aerosol particles. Multiple scattering is calculated directly in clouds but is parameterized in clear air by decreasing the scattering rates of sunlight and of skylight in the Earth’s shadow by 30%.

© 2005 Optical Society of America

OCIS Codes
(010.1290) Atmospheric and oceanic optics : Atmospheric optics
(010.1310) Atmospheric and oceanic optics : Atmospheric scattering
(010.4030) Atmospheric and oceanic optics : Mirages and refraction
(010.4950) Atmospheric and oceanic optics : Ozone
(290.1090) Scattering : Aerosol and cloud effects
(290.1310) Scattering : Atmospheric scattering
(290.4210) Scattering : Multiple scattering
(330.1690) Vision, color, and visual optics : Color

History
Original Manuscript: January 7, 2005
Revised Manuscript: May 12, 2005
Manuscript Accepted: May 12, 2005
Published: September 20, 2005

Citation
Stanley David Gedzelman, "Simulating colors of clear and partly cloudy skies," Appl. Opt. 44, 5723-5736 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-27-5723

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