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Discussion papers
https://doi.org/10.5194/acp-2019-875
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-875
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 08 Nov 2019

Submitted as: research article | 08 Nov 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Ozone Pollution over China and India: Seasonality and Sources

Meng Gao1,2, Jinhui Gao3, Bin Zhu4, Rajesh Kumar5, Xiao Lu2, Shaojie Song2, Yuzhong Zhang2, Peng Wang6, Gufran Beig7, Jianlin Hu8, Qi Ying6, Hongliang Zhang9, Peter Sherman10, and Michael B. McElroy2,10 Meng Gao et al.
  • 1Department of Geography, Hong Kong Baptist University, Hong Kong SAR, China
  • 2John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, United States
  • 3Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen, China
  • 4Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing, China
  • 5National Center for Atmospheric Research, Boulder, CO, USA
  • 6Zachry Department of Civil Engineering, Texas A&M University, College Station, TX 77843-3136, USA
  • 7Indian Institute of Tropical Meteorology, Pune, India
  • 8School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, 219 Ningliu Road, Nanjing 210044, China
  • 9Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China
  • 10Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States

Abstract. A regional fully coupled meteorology-chemistry Weather Research and Forecasting model with Chemistry (WRF-Chem) was employed to study the seasonality of ozone (O3) pollution and its sources in both China and India. Observations and model results suggest that O3 in the North China Plain (NCP), Yangtze River Delta (YRD), Pearl River Delta (PRD) and India exhibit distinctive seasonal features, which are linked to the influence of summer monsoons. Through a factor separation approach, we examined the sensitivity of O3 to individual anthropogenic, biogenic, and biomass burning emissions. We found that summer O3 formation is more sensitive to industrial sources than to other source sectors for China, while the transport vehicle sector is more important in all seasons for India. For India, in addition to transport, the residential sector also plays an important role in winter when O3 concentrations peak. Tagged simulations suggest that sources in east China play an important role in the formation of the summer O3 peak in the NCP, but sources from Northwest China should not be neglected to control summer O3 in the NCP. For the YRD region, prevailing winds and cleaner air from the ocean in summer lead to reduced transport from polluted regions, and the major source region in addition to local sources is Southeast China. For the PRD region, the upwind region is replaced by contributions from polluted east China as autumn approaches, leading to an autumn peak. The major upwind regions in autumn for the PRD are YRD (11 %) and Southeast China (10 %). For India, sources in North India are more important than sources in the south. These analyses emphasize the relative importance of source sectors and regions as they change with seasons, providing important implications for O3 control strategies.

Meng Gao et al.
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Short summary
A regional fully coupled meteorology-chemistry Weather Research and Forecasting model with Chemistry (WRF-Chem) was employed to study the seasonality of ozone (O3) pollution and its sources in both China and India.
A regional fully coupled meteorology-chemistry Weather Research and Forecasting model with...
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