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Preprints
https://doi.org/10.5194/acp-2020-539
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-539
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  01 Jul 2020

01 Jul 2020

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This preprint is currently under review for the journal ACP.

Tracing the evolution of morphology and mixing state of soot particles along with the movement of an Asian dust storm

Liang Xu1, Satoshi Fukushima2, Sophie Sobanska3, Kotaro Murata2, Ayumi Naganuma2, Lei Liu1, Yuanyuan Wang1, Hongya Niu4, Zongbo Shi5, Tomoko Kojima6, Daizhou Zhang2, and Weijun Li1 Liang Xu et al.
  • 1Department of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou 310027, China
  • 2Faculty of Environmental and Symbiotic Sciences, Prefectural University of Kumamoto, Kumamoto 862-8502, Japan
  • 3Institute of Molecular Sciences, UMR CNRS 5255, University of Bordeaux, 351 cours de la libération, 33405 Talence, France
  • 4Key Laboratory of Resource Exploration Research of Hebei Province, Hebei University of Engineering, Handan 056038, Hebei, China
  • 5School of Geography, Earth and Environmental Sciences, University of Birmingham, UK
  • 6Department Earth and Environmental Science, Faculty of Advanced Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan

Abstract. Tracing the aging progress of soot particles during transport is highly challenging. An Asian dust event could provide an ideal opportunity to trace the continuous aging progress of long-range transported soot particles. Here, we collected individual aerosol particles at an inland urban site (T1) and a coastal urban site (T2) in China and a coastal site (T3) in southwestern Japan during an Asian dust event. Microscopic analysis showed that the number fraction of soot-bearing particles increased from 19 % to 22 % from T1 to T2 in China but surprisingly increased to 56 % at T3 in Japan. The dominant fresh soot (71 %) at T1 became partially embedded (70 %) at T2 and fully embedded (84 %) at T3. These results indicated that the soot particles had lower deposition than other aerosol types and became more aged from T1 to T3. The fractal dimension of the soot particles slightly changed from 1.74 at T1 and 1.78 at T2 but significantly became 1.91 at T3. We found that the soot morphology compressed depending on secondary coating thickness and relative humidity. Moreover, we observed a unique mixing structure at T3 that tiny soot particles were seemly broken from large ones cross the East China Sea and distributed in organic coatings instead of sulfate core in particles. Our study provide important constraints of the morphological effects to better understand changes of microscopic structures of soot. These new findings will be helpful to improve optical calculation and modeling of soot particles and their regional climate effects in the atmosphere.

Liang Xu et al.

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Short summary
We quantified the mixing structures of the soot particles and found that the dominant mixing structure changed from fresh to partially embedded to fully embedded along the pathway of an Asian dust storm from East China to Japan. Soot particles became more compact following transport. Our findings not only provide direct evidence for soot aging during regional transport but also help us understand how their morphology changes in different environmental air.
We quantified the mixing structures of the soot particles and found that the dominant mixing...
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