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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-686
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
06 Sep 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
Optical and microphysical properties of natural mineral dust and anthropogenic soil dust near dust source regions over Northwestern China
Xin Wang1, Hui Wen1, Jinsen Shi1, Jianrong Bi1, Zhongwei Huang1, Beidou Zhang1, Tian zhou1, Kaiqi Fu1, Quanliang Chen2, and Jinyuan Xin3 1Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China
2Plateau Atmospheric and Environment Laboratory of Sichuan Province, College of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China
3State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
Abstract. From 3 April to 16 May 2014, a ground-based mobile laboratory was deployed to measure the optical and microphysical properties of tropospheric aerosols near dust source regions in Wuwei, Zhangye, and Dunhuang along the Hexi Corridor over Northwestern China. This study is novel in that we not only captured natural mineral dust near the Taklimakan and Badain Jaran desert regions but also characterized the properties of anthropogenic soil dust produced by agricultural cultivations (e.g., land planning, ploughing, and disking), especially during floating dust episodes. In this dust campaign, the aerosol scattering (absorption) coefficient (σsp and σap), single scattering albedo (ω), scattering Ångström exponent (Åsp), mass scattering efficiency (MSE), and aerosol size distribution were observed at 5-min intervals. The results indicate that large differences were found between the optical and microphysical properties of anthropogenic and natural dust because of floating dust episodes and dust storms. The values of σsp, σap and ω of PM2.5 measured at 550 nm range from ~ 37–532 Mm−1, ~ 2.2–55.3 Mm−1 and ~ 0.64–0.98, respectively, because of the presence of anthropogenic soil dust during floating dust episodes, and the corresponding values under background conditions are ~ 21–163 Mm−1, ~ 1.3–34.8 Mm−1, and ~ 0.70–0.98, respectively. We note that the higher values of σsp and ω and lower values of Åsp indicate that the aerosol particles observed during a strong dust storm in Zhangye were dominated by coarse mode particles originating from desert regions. However, the highest values of MSE reveal that the anthropogenic soil dust produced by agricultural cultivations can scatter more solar radiation than coarse mode particles.

Citation: Wang, X., Wen, H., Shi, J., Bi, J., Huang, Z., Zhang, B., zhou, T., Fu, K., Chen, Q., and Xin, J.: Optical and microphysical properties of natural mineral dust and anthropogenic soil dust near dust source regions over Northwestern China, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-686, in review, 2017.
Xin Wang et al.
Xin Wang et al.
Xin Wang et al.

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Short summary
A ground-based mobile laboratory was deployed near the dust source regions over Northwest China from 3 April to 16 May 2014. The results indicate that large differences were found between the optical and microphysical properties of anthropogenic and natural dust because of floating dust episodes and dust storms. This study is novel in that we not only captured natural mineral dust, but also characterized the properties of anthropogenic soil dust produced by agricultural cultivations.
A ground-based mobile laboratory was deployed near the dust source regions over Northwest China...
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