Dust optical properties retrieved from ground-based polarimetric measurements

We have systematically processed one year of sunphotometer measurements (recorded at five AERONET/PHOTONS sites in Africa) in order to assess mineral dust optical properties with the use of a new polarimetry-based algorithm. We consider the Cimel CE318 polarized sunphotometer version to obtain singl...

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Bibliographic Details
Published in:Applied optics (2004) 2007-03, Vol.46 (9), p.1548-1553
Main Authors: Li, Zhengqiang, Goloub, Philippe, Blarel, Luc, Damiri, Bahaiddin, Podvin, Thierry, Jankowiak, Isabelle
Format: Article
Language:English
Subjects:
Aerosols - analysis
Aerosols - chemistry
Algorithms
Dust - analysis
Image Interpretation, Computer-Assisted - methods
Particle Size
Photometry - methods
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Summary:We have systematically processed one year of sunphotometer measurements (recorded at five AERONET/PHOTONS sites in Africa) in order to assess mineral dust optical properties with the use of a new polarimetry-based algorithm. We consider the Cimel CE318 polarized sunphotometer version to obtain single-scattering albedo, scattering phase matrix elements F(11) and F(12) for dust aerosols selected with Angström exponents ranging from -0.05 to 0.25. Retrieved F(11) and F(12) differ significantly from those of spherical particles. The degree of linear polarization -F(12)/F(11) for single scattering of atmospheric total column dust aerosols in the case of unpolarized incident light is systematically retrieved for the first time to our knowledge from sunphotometer measurements and shows consistency with previous laboratory characterizations of nonspherical particles.
ISSN:1559-128X
DOI:10.1364/AO.46.001548