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Discussion papers
https://doi.org/10.5194/acp-2019-143
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-143
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 26 Apr 2019

Research article | 26 Apr 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Enrichment of submicron sea salt-containing particles in small cloud droplets based on single particle mass spectrometry

Qinhao Lin1, Yuxiang Yang1,2, Yuzhen Fu1,2, Guohua Zhang1, Feng Jiang1,2, Long Peng1,2, Xiufeng Lian1,2, Fengxian Liu1,2,a, Xinhui Bi1, Lei Li3, Duohong Chen4, Mei Li3, Jie Ou5, Mingjin Tang1, Xinming Wang1, Ping’an Peng1, and Guoying Sheng1 Qinhao Lin et al.
  • 1State Key Laboratory of Organic Geochemistryand Guangdong Key Laboratory of Environmental Resources Utilization and Protection, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, PR China
  • 2University of Chinese Academy of Sciences, Beijing 100039, PR China
  • 3Institute of Mass Spectrometer and Atmospheric Environment, Jinan University, Guangzhou 510632, PR China
  • 4State Environmental Protection Key Laboratory of Regional Air Quality Monitoring, Guangdong Environmental Monitoring Center, Guangzhou 510308, PR China
  • 5Shaoguan Environmental Monitoring Center, Shaoguan 512026, PR China
  • apresent address: College of Economics and Management, Taiyuan University of Technology, Taiyuan 030024, PR China

Abstract. The effects of chemical composition and size of sea salt-containing particles on their cloud condensation nuclei (CCN) activity are incompletely understood. We used a ground-based counterflow virtual impactor (GCVI) coupled with a single particle aerosol mass spectrometer (SPAMS) to characterize chemical composition of submicron (dry diameter of 0.2–1.0 μm) and supermicron (dry diameter of 1.0–2.0 μm) sea salt-containing cloud residues (dried cloud droplets) at Mount Nanling, southern China. Seven cut sizes (7.5–14 μm) of cloud droplets were set in the GCVI system. Approximately 20 % (by number) of the submicron cloud residues included sea salt-containing particles at the cut size of 7.5 μm, which was significantly higher than the percentages at the cut sizes of 8–14 μm (below 2 %). This difference was likely to be involved in the change in the chemical composition. For the cut size of 7.5 μm, nitrate was internally mixed with over 90 % of the submicron sea salt-containing cloud residues, which was higher than sulfate (20 %), ammonium (below 1 %), amines (6 %), hydrocarbon organic species (2 %), and organic acids (4 %). However, nitrate, sulfate, ammonium, amines, hydrocarbon organic species, and organic acids were internally mixed with over 90 %, over 80 %, 39–84 %, 71–86 %, 52–90 %, and 32–77 %, respectively, of the submicron sea salt-containing cloud residues for the cut sizes of 8–14 μm. The proportion of sea salt-containing particles in the supermicron cloud residues generally increased as a function of cut size, and their CCN activity was less influenced by chemical composition. This study highlights the different distribution of the submicron and supermicron sea salt-containing particles in various cloud droplets, which might further influence their atmospheric residence time.

Qinhao Lin et al.
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Short summary
The effects of chemical composition and size of sea salt-containing particles on their cloud condensation nuclei activity are incompletely understood. Our results showed that submicron sea salt-containing particles can enrich in small cloud droplets, likely due to change in the chemical composition, while supermicron sea salt-containing particles tended in the large cloud droplets, less affected by chemical composition. This difference might further influence their atmospheric residence time.
The effects of chemical composition and size of sea salt-containing particles on their cloud...
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