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

Author:
  • R Hegedus
  • Susanne Åkesson
  • G Horvath
Publishing year: 2007
Language: English
Pages: 2717-2726
Publication/Series: Applied Optics
Volume: 46
Issue: 14
Document type: Journal article
Publisher: OSA

Abstract english

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.

Keywords

  • Biological Sciences

Other

Published
  • ISSN: 2155-3165
Susanne Åkesson
E-mail: susanne [dot] akesson [at] biol [dot] lu [dot] se

Professor

Evolutionary ecology

+46 46 222 37 05

+46 70 245 04 23

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