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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/acp-2020-152
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-152
© 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.

Measurement Report: important contributions of oxygenated compounds to emissions and chemistry of VOCs in urban air

Caihong Wu1,2, Chaomin Wang1,2, Sihang Wang1,2, Wenjie Wang3, Bin Yuan1,2, Jipeng Qi1,2, Baolin Wang5, Hongli Wang6, Chen Wang5, Wei Song4, Xinming Wang4, Weiwei Hu4, Shengrong Lou6, Chenshuo Ye3, Yuwen Peng1,2, Zelong Wang1,2, Yibo Huangfu1,2, Yan Xie7, Manni Zhu7, Junyu Zheng1,2, Xuemei Wang1,2, Bin Jiang1,2, Zhanyi Zhang1,2, and Min Shao1,2 Caihong Wu et al.
  • 1Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China
  • 2Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou 511443, China
  • 3State Joint Key Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
  • 4The State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
  • 5School of Environmental Science and Engineering, Qilu University of Technology,Jinan 250353, China
  • 6State Environmental Protection Key Laboratory of Formation and Prevention of Urban Air Pollution Complex, Shanghai Academy of Environmental Sciences, Shanghai 200233, China
  • 7College of Environment and Energy, South China University of Technology, Guangzhou 510006, China

Abstract. Volatile organic compounds (VOCs) play important roles in the tropospheric atmosphere. In this study, VOCs were measured at an urban site in Guangzhou, one of the mega-cities in Pearl River Delta (PRD) using a gas chromatograph mass spectrometer/flame ionization detection (GC-MS/FID) and a proton transfer reaction time-of-flight mass spectrometer (PTR-ToF-MS). Diurnal profile analyses show that stronger chemical removal by OH radicals for more reactive hydrocarbons during the daytime. Diurnal profiles of OVOCs indicate evidence of contributions from secondary formation. Detailed source analyses of OVOCs using a photochemical age-based parameterization method suggest important contributions from both primary emissions and secondary formation for measured OVOCs. During the campaign, around 1700 ions were detected in PTR-ToF-MS mass spectra, among of which 462 ions with noticeable concentrations. VOCs signals from these ions without calibration in PTR-TOF-MS are quantified based on sensitivities of available VOCs species. OVOC-related ions dominated PTR-ToF-MS mass spectra with an average contribution of 77.2 %. Combining measurements from PTR-ToF-MS and GC-MS/FID, OVOCs contribute 57.4 % to the total concentration of VOCs. Using concurrent measurement of OH reactivity, OVOCs measured by PTR-ToF-MS contribute greatly to the OH reactivity (19.3 %). In comparison, hydrocarbons account for 20.0 % of OH reactivity. Adding up the contributions from inorganic gases (47.9 %), ∼ 12 % of the OH reactivity remains as missing. Our results demonstrate the important roles of OVOCs in the emission and evolution budget of VOCs in urban atmosphere.

Caihong Wu et al.

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Caihong Wu et al.

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Latest update: 28 Oct 2020
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Short summary
Based on measurements from an online mass spectrometer, we quantify volatile organic compounds (VOCs) concentrations from numerous ions of the mass spectrometer, using information from laboratory obtained calibration results. We find that most of these concentrations are from oxygenated VOCs (OVOCs). We further show that these OVOCs also contribute significantly to OH reactivity. Our results suggest the important roles of OVOCs in VOCs emission and chemistry in urban air.
Based on measurements from an online mass spectrometer, we quantify volatile organic compounds...
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