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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-1160
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
02 Jan 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
Impacts of Biogenic Emissions on Summertime Ozone Formation in the Guanzhong Basin, China
Nan Li1,2, Qingyang He2,3, Jim Greenberg4, Alex Guenther5, Junji Cao2,6, Jun Wang7, Hong Liao1, and Qiang Zhang8 1Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Engineering Technology Research Center of Environmental Cleaning Materials, Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China
2Key Lab of Aerosol Chemistry & Physics, SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, 710061, China
3Nanjing Star-jelly Environmental Consultants Co., Ltd, Nanjing, 210013, China
4National Center for Atmospheric Research, CO, USA
5Department of Earth System Science, University of California, Irvine, Irvine CA 92697-3100, USA
6Institute of Global Environmental Change, Xi’an Jiaotong University, Xi’an, 710049, China
7Center of Global and Regional Environmental Research, Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, Iowa, USA
8Department of Earth System Science, Tsinghua University, Beijing, 100084, China
Abstract. This study is the first attempt to understand the synergistic impact of anthropogenic and biogenic emissions on summertime ozone (O3) formation in the Guanzhong (GZ) basin where Xi’an, the oldest and the most populous city (with a population of 9 million) in the northwest China, is located. Month-long (August 2011) WRF-Chem simulations with different sensitivity experiments were conducted and compared with near-surface measurements. Biogenic volatile organic compounds (VOCs) concentrations were characterized from 6 surface sites among the Qinling Mountains, and urban air composition was measured in the Xi’an city at a tower 100 m above the surface. The WRF-Chem control experiment reasonably reproduced the magnitudes and variations of observed O3, VOCs, NOx, PM2.5 and meteorological parameters, with normalized mean biases for each parameter within ±21 %. Subsequent analysis employed the factor separation approach (FSA) to quantitatively disentangle the pure and synergistic impacts of anthropogenic and/or biogenic sources on summertime O3 formation. The impact of anthropogenic sources alone was found to be dominant for O3 formation. Although anthropogenic particles reduced NO2 photolysis by up to 60 %, the anthropogenic sources contributed 19.1 ppb O3 formation on average for urban Xi’an. The abundant biogenic VOCs from the nearby forests promoted O3 formation in urban areas by interacting with the anthropogenic NOx. The calculated synergistic contribution (from both biogenic and anthropogenic sources) was up to 14.4 ppb in urban Xi’an, peaking in the afternoon. Our study reveals that the synergistic impact of individual source contributions to O3 formation should be considered in the formation of air pollution control strategies, especially for big cities in the vicinity of forests.

Citation: Li, N., He, Q., Greenberg, J., Guenther, A., Cao, J., Wang, J., Liao, H., and Zhang, Q.: Impacts of Biogenic Emissions on Summertime Ozone Formation in the Guanzhong Basin, China, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-1160, in review, 2018.
Nan Li et al.
Nan Li et al.

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Short summary
O3 pollution has been increasing in most Chinese cities in recent years, and in some highly urbanized areas in China, the O3 pollution increased by up to 100 % from 2013–2017. Our study reveals that the synergistic impact of individual source contributions to O3 formation should be considered in the formation of air pollution control strategies, especially for big cities in the vicinity of forests.
O3 pollution has been increasing in most Chinese cities in recent years, and in some highly...
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