Light Scattering from Volcanic-Sand Particles in Deposited and Aerosol Form

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 t...

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Bibliographic Details
Published in:Atmospheric Environment
Main Authors: Zubko, N., Muñoz, O., Zubko, E., Gritsevich, M., Escobar-Cerezo, J., Berg, M. J., Peltoniemi, J.
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier Ltd 2019
Subjects:
AEROSOLS
DISCRETE DIPOLE APPROXIMATION
LIGHT SCATTERING
PARTICULATE SURFACE
PHOTOMETRY
POLARIMETRY
RADIOMETRY
REFRACTIVE INDEX
REMOTE SENSING
SOOT
VOLCANIC SAND
COSMOLOGY
DUST
LIGHT ABSORPTION
PARTICLE SIZE ANALYSIS
POLARIMETERS
SOLAR ENERGY
STORMS
VOLCANOES
ATMOSPHERIC CONTAMINANTS
COMPARATIVE ANALYSIS
DEGREE OF LINEAR POLARIZATION
EXPERIMENTAL APPARATUS
REMOTE SENSING APPLICATIONS
RESEARCH INSTITUTES
SAND
CARBON
ABSORPTION
AEROSOL
DISCRETE ELEMENT METHOD
DUST STORM
PARTICULATE MATTER
PHOTOMETER
POLARIZATION
RADIOMETRIC METHOD
VOLCANIC ISLAND
Iceland
Online Access:http://elar.urfu.ru/handle/10995/111707
https://doi.org/10.1016/j.atmosenv.2019.06.051
Description
Summary: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. © 2019. This research was partially supported by the Academy of Finland Project no. 260027 and the COST Action MP1104 “Polarization as a tool to study the Solar System and beyond”. NZ acknowledges Magnus Ehrnrooth Foundation for the research travel support. This work also has been partially supported by contracts AYA2015-67152-R and RTI2018-095330-B-I00 . We thank P. Dagsson Waldhauserová, O. Arnalds, A. Virkkula, O. Meinander, and J. Svensson for their help obtaining the samples and for relevant discussions. We acknowledge ...

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