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Atmospheric ozone and colors of the Antarctic twilight sky |
Applied Optics, Vol. 50, Issue 28, pp. F162-F171 (2011)
http://dx.doi.org/10.1364/AO.50.00F162
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Abstract
Zenith skylight is often distinctly blue during clear civil twilights, and much of this color is due to preferential absorption at longer wavelengths by ozone’s Chappuis bands. Because stratospheric ozone is greatly depleted in the austral spring, such decreases could plausibly make Antarctic twilight colors less blue then, including at the zenith. So for several months in 2005, we took digital images of twilight zenith and antisolar skies at Antarctica’s Georg von Neumayer Station. Our colorimetric analysis of these images shows only weak correlations between ozone concentration and twilight colors. We also used a spectroradiometer at a midlatitude site to measure zenith twilight spectra and colors. At both locations, spectral extinction by aerosols seems as important as ozone absorption in explaining colors seen throughout the twilight sky.
© 2011 Optical Society of America
OCIS Codes
(010.1290) Atmospheric and oceanic optics : Atmospheric optics
(010.3920) Atmospheric and oceanic optics : Meteorology
(010.4950) Atmospheric and oceanic optics : Ozone
(330.1730) Vision, color, and visual optics : Colorimetry
(010.1030) Atmospheric and oceanic optics : Absorption
(010.1690) Atmospheric and oceanic optics : Color
History
Original Manuscript: May 25, 2011
Revised Manuscript: August 16, 2011
Manuscript Accepted: August 19, 2011
Published: September 30, 2011
Citation
Raymond L. Lee, Jr., Wolfgang Meyer, and Götz Hoeppe, "Atmospheric ozone and colors of the Antarctic twilight sky," Appl. Opt. 50, F162-F171 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-28-F162
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