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Preprints
https://doi.org/10.5194/acp-2020-373
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-373
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  07 May 2020

07 May 2020

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A revised version of this preprint was accepted for the journal ACP and is expected to appear here in due course.

Impact of in-cloud aqueous processes on the chemical compositions and morphology of individual atmospheric aerosols

Yuzhen Fu1,2, Qinhao Lin1,a, Guohua Zhang1,3, Yuxiang Yang1,2, Yiping Yang2,4, Xiufeng Lian1,2, Long Peng1,2, Feng Jiang1,2,b, Xinhui Bi1,3, Lei Li5, Yuanyuan Wang6, Duohong Chen7, Jie Ou8, Xinming Wang1,3, Ping'an Peng1,3, Jianxi Zhu3, and Guoying Sheng1 Yuzhen Fu et al.
  • 1State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, PR China
  • 2University of Chinese Academy of Sciences, Beijing 100049, PR China
  • 3Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control, Guangzhou 510640, PR China
  • 4CAS Key Laboratory of Mineralogy and Metallogeny & Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640, PR China
  • 5Instituteof Mass Spectrometer and Atmosphere Environment, Jinan University, Guangzhou 510632, PR China
  • 6Departmentof Atmospheric Science, School of Earth Science, Zhejiang University, Hangzhou 310027, PR China
  • 7State EnvironmentalProtection Key Laboratory of Regional Air Quality Monitoring, Guangdong Environmental Monitoring Center, Guangzhou 510308, PR China
  • 8Shaoguan EnvironmentalMonitoring Center, Shaoguan 512026, PR China
  • anow at: Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, PR China
  • bnow at: Institute of Meteorology and Climate Research, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen 76344, Germany

Abstract. The composition, morphology, and mixing structure of individual cloud residues (RES) and interstitial particles (INT) at a mountain-top site were investigated. Eight types of particles were identified, including sulfate-rich (S-rich), S-organic matter (OM), aged soot, aged mineral, aged fly ash, aged metal, fresh mixture, and aged mixture. A shift of dominant particle types from S-rich (29 %) and aged soot (27 %) in the INT to S-OM (24 %) and aged mixture (22 %) in the RES is observed. In particular, particles with organic shells are enriched in the RES (30 %) relative to the INT (12 %). Our results highlight the in-cloud formation of more oxidized organic shells on the activated particles. We also show that in-cloud processes may result in less compact soot, with the fractal dimensions (Df) of soot in the RES (1.82 ± 0.12) lower than those in the INT (2.11 ± 0.09). This research emphasizes the role of in-cloud processes on the chemistry and microphysical properties of individual particles. Given that organic coatings may determine the particle hygroscopicity, activation ability, and heterogeneous chemical reactivity, the increase of OM-shelled particles upon in-cloud processes should have considerable implications.

Yuzhen Fu et al.

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AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Interactive discussion

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Yuzhen Fu et al.

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Short summary
Based on the analysis of the morphology and mixing structure of the activated and un-activated particles, our results emphasize the role of in-cloud processes on the chemistry and microphysical properties of individual activated particles. Given that organic coatings may determine the particle hygroscopicity and heterogeneous chemical reactivity, the increase of OM-shelled particles upon in-cloud processes should have considerable implications in their evolution and climate impact.
Based on the analysis of the morphology and mixing structure of the activated and un-activated...
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