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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-785
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
25 Aug 2017
Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Atmospheric Chemistry and Physics (ACP) and is expected to appear here in due course.
The single-particle mixing state and cloud scavenging of black carbon at a high-altitude mountain site in southern China
Guohua Zhang1, Qinhao Lin1,2, Long Peng1,2, Xinhui Bi1, Duohong Chen3, Mei Li4,5, Lei Li4,5, Fred J. Brechtel6, Jianxin Chen7, Weijun Yan7, Xinming Wang1, Ping’an Peng1, Guoying Sheng1, and Zhen Zhou3 1State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Resources Utilization and Protection, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, PR China
2Graduate University of Chinese Academy of Sciences, Beijing 100039, PR China
3State Environmental Protection Key Laboratory of Regional Air Quality Monitoring, Guangdong Environmental Monitoring Center, Guangzhou 510308, PR China
4Institute of Mass Spectrometer and Atmospheric Environment, Jinan University, Guangzhou 510632, China
5Guangdong Provincial Engineering Research Center for on-line source apportionment system of air pollution, Guangzhou 510632, China
6Brechtel Manufacturing Inc., Hayward, 94544, California, USA
7Shaoguan Environmental Monitoring Center, Shaoguan 512026, PR China
Abstract. In the present study, a ground-based counterflow virtual impactor (GCVI) was used to sample cloud droplet residual (cloud RES) particles, while a parallel PM2.5 inlet was used to sample cloud-free or cloud interstitial (cloud INT) particles. The mixing state of black carbon (BC)-containing particles in a size range of 0.1–1.6 µm and the mass concentrations of BC in the cloud-free, RES and INT particles were investigated using a single particle aerosol mass spectrometer (SPAMS) and two aethalometers, respectively, at a mountain site (1690 m a.s.l.) in southern China. The measured BC-containing particles were internally mixed extensively with sulfate, and were activated into cloud droplets to the same extent as all the measured particles. The results indicate the preferential activation of larger particles and/or that the production of secondary compositions shifts the BC-containing particles towards larger sizes. BC-containing particles with an abundance of both sulfate and organics were activated less than those with sulfate but limited organics, implying the importance of the mixing state on the incorporation of BC-containing particles into cloud droplets. The mass scavenging efficiency of BC with an average of 33 % was similar for different cloud events independent of the air mass. This is the first time that both the mixing state and cloud scavenging of BC in China have been reported. Since limited information on BC-containing particles in the free troposphere is available, the results also provide an important reference for the representation of BC concentrations, properties, and climate impacts in modeling studies.

Citation: Zhang, G., Lin, Q., Peng, L., Bi, X., Chen, D., Li, M., Li, L., Brechtel, F. J., Chen, J., Yan, W., Wang, X., Peng, P., Sheng, G., and Zhou, Z.: The single-particle mixing state and cloud scavenging of black carbon at a high-altitude mountain site in southern China, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-785, in review, 2017.
Guohua Zhang et al.
Guohua Zhang et al.

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Short summary
The mixing state of black carbon (BC)-containing particles and the mass scavenging efficiency of BC in cloud were investigated at a mountain site (1690 m a.s.l.) in southern China. The measured BC-containing particles were internally mixed extensively with sulfate, and were activated into cloud droplets to the same extent as all the measured particles. The mass scavenging efficiency of BC with an average of 33 % was similar for different cloud events independent of the air mass.
The mixing state of black carbon (BC)-containing particles and the mass scavenging efficiency of...
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