Light scattering from volcanic-sand particles in deposited and aerosol form

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Zubko , N , Muñoz , O , Zubko , E , Gritsevich , M , Escobar-Cerezo , J , Berg , M J & Peltoniemi , J 2019 , ' Light scattering from volcanic-sand particles in deposited and aerosol form ' , Atmospheric Environment , vol. 215 , 116813 .

Title: Light scattering from volcanic-sand particles in deposited and aerosol form
Author: Zubko, Nataliya; Muñoz, Olga; Zubko, Evgenij; Gritsevich, Maria; Escobar-Cerezo, Jesús; Berg, Matthew J.; Peltoniemi, Jouni
Contributor organization: Department of Physics
Particle Physics and Astrophysics
Date: 2019-10-15
Language: eng
Number of pages: 12
Belongs to series: Atmospheric Environment
ISSN: 1352-2310
Abstract: The light-scattering properties of volcanic sand collected in Iceland are studied here to characterize the sand particles and develop a reference for future remote-sensing observations. While such sand is common in Iceland, the smaller-size fraction can be readily transported by winds and found in the atmosphere at distant locations. The sand appears dark when deposited on a surface due to the high optical absorption of the material. Therefore, atmospheric regions containing such particles during a dust storm may absorb sunlight considerably, causing redistribution of solar energy. Here, we measure the angular scattered-light intensity and degree of linear polarization from the sand. This is done with two experimental apparatuses, the Cosmic Dust Laboratory (CoDuLab) at the Institute de Astrofísica de Andalucía (IAA) and the goniospectropolarimeter (FIGIFIGO) at the Finnish Geospatial Research Institute (FGI). Two scattering-scenarios of practical interest for remote-sensing applications are considered: (1) single sand-particles suspended in aerosol as an optically thin cloud, and (2) the same particles deposited on a substrate. We also model the measurements with the discrete dipole approximation to estimate the complex-valued refractive index m, where we find that m ≈ 1.6 + 0.01i at λ = 647 nm. Lastly, we present a comparative analysis of the polarimetric response of the sand particles with that reported in the literature for carbon-soot, another highly absorbing atmospheric contaminant.
Subject: Volcanic sand
Remote sensing
Particulate surface
Light scattering
Discrete dipole approximation
Refractive index
114 Physical sciences
1171 Geosciences
Peer reviewed: Yes
Rights: cc_by_nc_nd
Usage restriction: openAccess
Self-archived version: acceptedVersion

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