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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-236
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-236
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 09 Aug 2019

Submitted as: research article | 09 Aug 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

An experimental study on light scattering matrices for Chinese loess dust with different particle size distributions

Jia Liu, Qixing Zhang, Jinjun Wang, and Yongming Zhang Jia Liu et al.
  • State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui, 230026, China

Abstract. Mineral dust suspended in the atmosphere has significant effects on radiative balance and climate change. Chinese Loess Plateau (CLP) is generally considered as a main sources of Asian dust aerosol. After being lifted by wind, dust particles with various size distributions can be transported for different distances. In this study, original loess sample was collected from Luochuan, which is centrally located at CLP, and two samples with different size distributions were obtained after then. Pristine loess was used to represent dust that only affect source regions, part of pristine loess was milled to finer milled loess that can be transported for long distance. Light scattering matrices for these two samples were measured at 532 nm wavelength from 5° to 160° angles. Particle size distribution, refractive index, chemical component, and microscopic appearance were also measured for auxiliary analyses. Results showed that discrepancies in angular behaviours of matrix elements for pristine loess and milled loess cannot be ignored. Given that the effective radii of these two loess samples differ by more than 20 times, it is reasonable to conclude that the difference in size distributions plays a major role in leading to different matrices, while refractive index and micro structure have relatively small impacts. Analyses of numerical simulation results about irregular particles also variety this conclusion. At last, synthetic scattering matrices for both pristine loess and milled loess were calculated over 0°–180°, and the previous average scattering matrix for loess dust was updated.

Jia Liu et al.
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An experimental study on light scattering matrices for Chinese loess dust with different particle size distributions J. Liu, Q. Zhang, J. Wang, and Y. Zhang https://doi.org/10.5281/zenodo.3361852

Jia Liu et al.
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Latest update: 21 Oct 2019
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Short summary
Angular behaviors of light scattering properties for loess dust sampled from Chinese Loess Plateau were investigated here, using a self-developed apparatus. Two samples with different size distributions were used to represent dust that can or cannot be transported for long range. Analyses of numerical simulations showed that differences of measurements are mainly result from different sizes. This study will help to develop proper optical models for dust during their transportation.
Angular behaviors of light scattering properties for loess dust sampled from Chinese Loess...
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