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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 35 — Dec. 10, 2012
  • pp: 8324–8340

Polarization impacts on the water-leaving radiance retrieval from above-water radiometric measurements

Tristan Harmel, Alexander Gilerson, Alberto Tonizzo, Jacek Chowdhary, Alan Weidemann, Robert Arnone, and Sam Ahmed  »View Author Affiliations


Applied Optics, Vol. 51, Issue 35, pp. 8324-8340 (2012)
http://dx.doi.org/10.1364/AO.51.008324


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Abstract

Above-water measurements of water-leaving radiance are widely used for water-quality monitoring and ocean-color satellite data validation. Reflected skylight in above-water radiometry needs to be accurately estimated prior to derivation of water-leaving radiance. Up-to-date methods to estimate reflection of diffuse skylight on rough sea surfaces are based on radiative transfer simulations and sky radiance measurements. But these methods neglect the polarization state of the incident skylight, which is generally highly polarized. In this paper, the effects of polarization on the sea surface reflectance and the subsequent water-leaving radiance estimation are investigated. We show that knowledge of the polarization field of the diffuse skylight significantly improves above-water radiometry estimates, in particular in the blue part of the spectrum where the reflected skylight is dominant. A newly developed algorithm based on radiative transfer simulations including polarization is described. Its application to the standard Aerosol Robotic Network-Ocean Color and hyperspectral radiometric measurements of the 1.5-year dataset acquired at the Long Island Sound site demonstrates the noticeable importance of considering polarization for water-leaving radiance estimation. In particular it is shown, based on time series of collocated data acquired in coastal waters, that the azimuth range of measurements leading to good-quality data is significantly increased, and that these estimates are improved by more than 12% at 413 nm. Full consideration of polarization effects is expected to significantly improve the quality of the field data utilized for satellite data validation or potential vicarious calibration purposes.

© 2012 Optical Society of America

OCIS Codes
(010.0010) Atmospheric and oceanic optics : Atmospheric and oceanic optics
(010.1320) Atmospheric and oceanic optics : Atmospheric transmittance
(010.4450) Atmospheric and oceanic optics : Oceanic optics
(280.0280) Remote sensing and sensors : Remote sensing and sensors

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: September 25, 2012
Revised Manuscript: November 5, 2012
Manuscript Accepted: November 5, 2012
Published: December 5, 2012

Virtual Issues
Vol. 8, Iss. 1 Virtual Journal for Biomedical Optics

Citation
Tristan Harmel, Alexander Gilerson, Alberto Tonizzo, Jacek Chowdhary, Alan Weidemann, Robert Arnone, and Sam Ahmed, "Polarization impacts on the water-leaving radiance retrieval from above-water radiometric measurements," Appl. Opt. 51, 8324-8340 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-35-8324

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