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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 14 — May. 10, 2007
  • pp: 2717–2726

Anomalous celestial polarization caused by forest fire smoke: why do some insects become visually disoriented under smoky skies?

Ramón Hegedüs, Susanne Åkesson, and Gábor Horváth  »View Author Affiliations

Applied Optics, Vol. 46, Issue 14, pp. 2717-2726 (2007)

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The effects of forest fire smoke on sky polarization and animal orientation are practically unknown. Using full-sky imaging polarimetry, we therefore measured the celestial polarization pattern under a smoky sky in Fairbanks, Alaska, during the forest fire season in August 2005. It is quantitatively documented here that the celestial polarization, a sky attribute that is necessary for orientation of many polarization-sensitive animal species, above Fairbanks on 17 August 2005 was in several aspects anomalous due to the forest fire smoke: (i) The pattern of the degree of linear polarization p of the reddish smoky sky differed considerably from that of the corresponding clear blue sky. (ii) Due to the smoke, p of skylight was drastically reduced ( p max 14 % , p average 8 % ). (iii) Depending on wavelength and time, the Arago, Babinet, and Brewster neutral points of sky polarization had anomalous positions. We suggest that the disorientation of certain insects observed by Canadian researchers under smoky skies during the forest fire season in August 2003 in British Columbia was the consequence of the anomalous sky polarization caused by the forest fire smoke.

© 2007 Optical Society of America

OCIS Codes
(010.1290) Atmospheric and oceanic optics : Atmospheric optics
(110.2960) Imaging systems : Image analysis
(120.5410) Instrumentation, measurement, and metrology : Polarimetry
(280.1310) Remote sensing and sensors : Atmospheric scattering
(330.7310) Vision, color, and visual optics : Vision

ToC Category:

Original Manuscript: October 19, 2006
Revised Manuscript: December 6, 2006
Manuscript Accepted: December 18, 2006
Published: April 23, 2007

Virtual Issues
Vol. 2, Iss. 6 Virtual Journal for Biomedical Optics

Ramón Hegedüs, Susanne Åkesson, and Gábor Horváth, "Anomalous celestial polarization caused by forest fire smoke: why do some insects become visually disoriented under smoky skies?," Appl. Opt. 46, 2717-2726 (2007)

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