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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Due to their lower diffusion capacities and higher conversion capacities, urban areas in Xi’an experienced severe ozone pollution in the summer, and the concentration and proportion of oxygenated VOCs increased significantly during ozone pollution days. Xi'an has a strong local emission source of VOCs, and vehicle exhaust was the primary VOC source. In addition, alkenes, aromatics, and OVOCs played a dominant role in secondary transformations.
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https://doi.org/10.5194/acp-2020-704
https://doi.org/10.5194/acp-2020-704

  27 Aug 2020

27 Aug 2020

Review status: a revised version of this preprint is currently under review for the journal ACP.

Spatiotemporal Variation, Sources, and Secondary Transformation Potential of VOCs in Xi’an, China

Mengdi Song1, Xin Li1, Suding Yang1, Xuena Yu1, Songxiu Zhou1, Yiming Yang1, Shiyi Chen1, Huabin Dong1, Keren Liao1, Qi Chen1, Keding Lu1, Ningning Zhang2, Junji Cao2, Liming Zeng1, and Yuanhang Zhang1 Mengdi Song et al.
  • 1State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
  • 2Key laboratory of Aerosol Chemistry and Physics, SKLLQG, Institute of Earth Environment, Chinese Academy of Science, Xi’an 710061, China

Abstract. As a critical precursors of ozone (O3) and secondary organic aerosols, volatile organic compounds (VOCs) play a vital role in air quality, human health, and climate change. In this study, a campaign of comprehensive field observations and VOC grid sampling was conducted in Xi’an, China from June 20 to July 20, 2019 to identify the spatiotemporal concentration levels, sources, and secondary transformation potential of VOCs. During the observation period, the average VOC concentrations at the Chanba (CB), Di Huan Suo (DHS), Qinling (QL), and gridded sampling sites were 27.8 ± 8.9, 33.8 ± 10.5, 15.5 ± 5.8, and 29.1 ± 8.4 ppb, respectively. Vehicle exhaust was the primary source of VOC emissions in Xi’an, and the contributions of vehicle exhaust to VOCs at the CB, DHS, and QL sites were 41.3 %, 30.6 %, and 23.6–41.4 %, respectively. While industrial emissions were the second-largest source of VOCs in urban areas, contributions from ageing sources were high in rural areas. High potential source contribution function values primarily appeared in eastern and southern Xi’an near the sampling site, which indicates that Xi'an exhibits a strong local VOC source. Moreover, alkenes, aromatics, and oxygenated VOCs played a dominant role in secondary transformation, which is a major concern in reducing O3 pollution in Xi’an.

Mengdi Song et al.

 
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Mengdi Song et al.

Mengdi Song et al.

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Short summary
Due to their lower diffusion capacities and higher conversion capacities, urban areas in Xi’an experienced severe ozone pollution in the summer, and the concentration and proportion of oxygenated VOCs increased significantly during ozone pollution days. Xi'an has a strong local emission source of VOCs, and vehicle exhaust was the primary VOC source. In addition, alkenes, aromatics, and OVOCs played a dominant role in secondary transformations.
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