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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/acp-2020-750
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-750
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  30 Jul 2020

30 Jul 2020

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This preprint is currently under review for the journal ACP.

Characterization of Submicron Organic Particles in Beijing During Summertime: Comparison Between SP-AMS and HR-AMS

Junfeng Wang1,2, Jianhuai Ye2, Dantong Liu3, Yangzhou Wu3, Jian Zhao4, Weiqi Xu4, Conghui Xie4, Fuzhen Shen1, Jie Zhang5, Paul E. Ohno2, Yiming Qin2, Xiuyong Zhao6, Scot T. Martin2, Alex K. Y. Lee7, Pingqing Fu8, Daniel J. Jacob2, Qi Zhang9, Yele Sun4, Mindong Chen1, and Xinlei Ge1 Junfeng Wang et al.
  • 1Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, China
  • 2School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, United States
  • 3Department of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou, China
  • 4State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
  • 5Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States
  • 6State Environmental Protection Key Laboratory of Atmospheric Physical Modeling and Pollution Control, State Power Environmental Protection Research Institute, Nanjing, China
  • 7Department of Civil and Environmental Engineering, National University of Singapore, Singapore
  • 8Institute of Surface-Earth System Science, Tianjin University, Tianjin, China
  • 9Department of Environmental Toxicology, University of California Davis, Davis, CA, United States

Abstract. Black carbon (BC) particles in Beijing summer haze play an important role in regional radiation balance and related environmental processes. Understanding the factors that lead to variability in the impacts of BC remains limited. Here, we present observations by a soot-particle aerosol mass spectrometer of BC-containing submicron particulate matter (BC-PM1) in the summer of 2017 in Beijing, China. These observations were compared to concurrently measured total non-refractory submicron particulate matter (NR-PM1) by a high-resolution aerosol mass spectrometer (HR-AMS). Distinct properties were observed between NR-PM1 and BC-PM1 related to organic aerosol (OA) composition with hydrocarbon-like OA in BC-PM1 up to two-fold higher than that in NR-PM1 in fresh vehicle emissions, suggesting that a part of HOA in BC-PM1 may be overestimated due to the change of the collection efficiency of SP-AMS. Cooking-related OA was only identified in NR-PM1, whereas aged biomass burning OA (A-BBOA) was a unique factor only identified in BC-PM1. The A-BBOA was linked to those heavily coated BC, which may lead to enhancement of light absorption ability of BC by a factor of two via the “lensing effect”. More-oxidized oxygenated OA identified in BC-containing particles was found to be slightly different from that observed by HR-AMS, mainly due to the influence of A-BBOA. Overall, these findings highlight that BC in urban Beijing is partly of agricultural fire origin and, a unique biomass burning-related OA associated with BC may be ubiquitous in aged BC-PM1, and this OA may play a role in affecting air quality and climate that has not previously been fully considered.

Junfeng Wang et al.

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