Light scattering properties of sea-salt aerosol particles inferred from modeling studies and ground.pdf

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Light scattering properties of sea-salt aerosol particles inferred from modeling studies and ground.pdf

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Light scattering properties of sea-salt aerosol particles inferred from modeling studies and ground

ARTICLE IN PRESSJournal of Quantitative Spectroscopy 0022-4073/$ - se doi:10.1016/j.jq Correspond E-mail addrRadiative Transfer 101 (2006) 498–511 /locate/jqsrtLight scattering properties of sea-salt aerosol particles inferred from modeling studies and ground-based measurements K. Chamaillard, C. Kleefeld, S.G. Jennings, D. Ceburnis, C.D. O’Dowd Atmospheric Research Group, Department of Physics, National University of Ireland, Galway, IrelandAbstract Direct climate radiative forcing depends on the aerosol optical depth t, the single scattering albedo $, and the up-scatter fraction b; these quantities are functions of the refractive index of the particles, their size relative to the incident wavelength, and their shape. Sea-salt aerosols crystallize into cubic shapes or in agglomerates of cubic particles under low relative humidity conditions. The present study investigates the effects of the shape of dried sea-salt particles on the detection of light scattering from the particles. Ground-based measurements of scattering and backscattering coefficients have been performed with an integrating nephelometer instrument for a wavelength l ? 0:55mm. The measurements are compared to two models: the Mie theory assuming a spherical shape for the particles and the Discrete Dipole Approximation (DDA) model for the hypothesis of cubic shape of the sea-salt aerosols. The comparison is made accurately by taking into account the actual range of the scattering angles measured by the nephelometer in both models that is from 71 to 1701 for the scattering coefficient and from 901 to 1701 for the backscattering coefficient. Modeled scattering and backscattering coefficients increase for nonspherical particles compared to spherical shape of particles with diameter larger than about 1 mm. However, the comparison of the modeling results with the measurements gives best agreement for particles diameter less than about 1mm. The size distribution of the particles is measured with two instru