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We performed measurements of gaseous and particulate organic compounds using a state-of-the-art online mass spectrometer in urban air. Using the dataset, we provide a holistic chemical characterization of oxygenated organic compounds in the polluted urban atmosphere, which can serve as a reference for the future field measurements of organic compounds in cities.
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https://doi.org/10.5194/acp-2020-1187
https://doi.org/10.5194/acp-2020-1187

  25 Nov 2020

25 Nov 2020

Review status: this preprint is currently under review for the journal ACP.

Chemical characterization of oxygenated organic compounds in gas-phase and particle-phase using iodide-CIMS with FIGAERO in urban air

Chenshuo Ye1, Bin Yuan2,3, Yi Lin2,3, Zelong Wang2,3, Weiwei Hu4, Tiange Li2,3, Wei Chen4, Caihong Wu2,3, Chaomin Wang2,3, Shan Huang2,3, Jipeng Qi2,3, Baolin Wang5, Chen Wang5, Wei Song4, Xinming Wang4, E Zheng2,3, Jordan E. Krechmer6, Penglin Ye7, Zhanyi Zhang2,3, Xuemei Wang2,3, Douglas R. Worsnop6, and Min Shao2,3,1 Chenshuo Ye et al.
  • 1College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
  • 2Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China
  • 3Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou 511443, China
  • 4Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 511443, China
  • 5School of Environmental Science and Engineering, Qilu University of Technology, Jinan 250353, China
  • 6Aerodyne Research, Inc. 45 Manning Rd., Billerica, MA, USA
  • 7Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China

Abstract. The characterization of oxygenated organic compounds in urban areas remains a pivotal gap in our understanding of the evolution of organic carbon under polluted environments, as the atmospheric processes involving interactions between organics and inorganics, anthropogenic pollutants and natural emissions lead to formation of various and complex secondary products. Here, we describe measurements of an iodide chemical ionization time-of-flight mass spectrometer installed with a Filter Inlet for Gases and AEROsols (FIGAERO-I-CIMS) in both gas-phase and particle-phase at an urban site in Guangzhou, a typical mega-city in southern China, during the autumn of 2018. Abundant oxygenated organic compounds containing 2~5 oxygen atoms were observed, including organic acids, multi-functional organics typically emitted form biomass burning, oxidation products of biogenic hydrocarbons and aromatics. Photochemistry played dominant roles in the formation of gaseous organic acids and isoprene-derived organic nitrates, while nighttime chemistry contributed significantly to the formation monoterpene-derived organic nitrates and inorganics. Nitrogen-containing organic compounds occupied a significant fraction of the total signal in both gas and particle phases, with elevated fractions at higher molecular weights. Measurements of organic compounds in particle phase by FIGAERO-I-CIMS explained 24 % of the total organic aerosol mass measured by aerosol mass spectrometer (AMS), and the fraction increased for more aged organic aerosol. The systematically interpretation of mass spectra of the FIGAERO-I-CIMS in urban of Guangzhou provides a holistic view of numerous oxygenated organic compounds in the urban atmosphere, which can serve as a reference for the future field measurements by FIGAERO-I-CIMS in polluted urban regions.

Chenshuo Ye et al.

 
Status: open (until 20 Jan 2021)
Status: open (until 20 Jan 2021)
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Chenshuo Ye et al.

Chenshuo Ye et al.

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Short summary
We performed measurements of gaseous and particulate organic compounds using a state-of-the-art online mass spectrometer in urban air. Using the dataset, we provide a holistic chemical characterization of oxygenated organic compounds in the polluted urban atmosphere, which can serve as a reference for the future field measurements of organic compounds in cities.
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