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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 19 — Jul. 1, 2008
  • pp: 3467–3480

Polarization of skylight in the O 2 A band: effects of aerosol properties

Eyk Boesche, Piet Stammes, Réne Preusker, Ralf Bennartz, Wouter Knap, and Juergen Fischer  »View Author Affiliations


Applied Optics, Vol. 47, Issue 19, pp. 3467-3480 (2008)
http://dx.doi.org/10.1364/AO.47.003467


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Abstract

Motivated by several observations of the degree of linear polarization of skylight in the oxygen A ( O 2 A ) band that do not yet have a quantitative explanation, we analyze the influence of aerosol altitude, microphysics, and optical thickness on the degree of linear polarization of the zenith skylight in the spectral region of the O 2 A band, between 755 to 775 nm . It is shown that the degree of linear polarization inside the O 2 A band is particularly sensitive to aerosol altitude. The sensitivity is strongest for aerosols within the troposphere and depends also on their microphysical properties and optical thickness. The polarization of the O 2 A band can be larger than the polarization of the continuum, which typically occurs for strongly polarizing aerosols in an elevated layer, or smaller, which typically occurs for depolarizing aerosols or cirrus clouds in an elevated layer. We show that in the case of a single aerosol layer in the atmosphere a determination of the aerosol layer altitude may be obtained. Furthermore, we show limitations of the aerosol layer altitude determination in case of multiple aerosol layers. To perform these simulations we developed a fast method for multiple scattering radiative transfer calculations in gaseous absorption bands including polarization. The method is a combination of doubling-adding and k-binning methods. We present an error estimation of this method by comparing with accurate line-by-line radiative transfer simulations. For the O 2 A band, the errors in the degree of linear polarization are less than 0.11% for transmitted light, and less than 0.31% for reflected light.

© 2008 Optical Society of America

OCIS Codes
(010.1110) Atmospheric and oceanic optics : Aerosols
(260.5430) Physical optics : Polarization
(280.1310) Remote sensing and sensors : Atmospheric scattering
(300.1030) Spectroscopy : Absorption

ToC Category:
Atmospheric and oceanic optics

History
Original Manuscript: February 4, 2008
Manuscript Accepted: May 8, 2008
Published: June 24, 2008

Citation
Eyk Boesche, Piet Stammes, Réne Preusker, Ralf Bennartz, Wouter Knap, and Juergen Fischer, "Polarization of skylight in the O2A band: effects of aerosol properties," Appl. Opt. 47, 3467-3480 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-19-3467

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