title: Dust optical properties retrieved from ground-based polarimetric measurements.
abstract: 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.
authors.affiliation: Laboratoire d'Optique Atmosphérique, Université des Sciences et Techniques de Lille, Villeneuve d'Ascq, France. zhengqiang.li@loa.univ-lill1.fr
authors.forename: Zhengqiang
authors.initials: Z
authors.lastname: Li
authors.forename: Philippe
authors.initials: P
authors.lastname: Goloub
authors.forename: Luc
authors.initials: L
authors.lastname: Blarel
authors.forename: Bahaiddin
authors.initials: B
authors.lastname: Damiri
authors.forename: Thierry
authors.initials: T
authors.lastname: Podvin
authors.forename: Isabelle
authors.initials: I
authors.lastname: Jankowiak
mesh_terms: D000336:Aerosols / Q000032:analysis* / Q000737:chemistry*; D000465:Algorithms; D004391:Dust / Q000032:analysis*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D010316:Particle Size; D010783:Photometry / Q000379:methods*
chemical_list: D000336:Aerosols; D004391:Dust