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Discussion papers
https://doi.org/10.5194/acp-2019-362
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-362
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 23 Apr 2019

Submitted as: research article | 23 Apr 2019

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This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Atmospheric Chemistry and Physics (ACP) and is expected to appear here in due course.

Substantial ozone enhancement over the North China Plain from increased biogenic emissions due to heat waves and land cover in summer 2017

Mingchen Ma1, Yang Gao1,2, Yuhang Wang3, Shaoqing Zhang2,4, L. Ruby Leung5, Cheng Liu6,7,8,9, Shuxiao Wang10, Bin Zhao11, Xing Chang10, Hang Su12, Tianqi Zhang1, Lifang Sheng13, Xiaohong Yao1,14, and Huiwang Gao1,14 Mingchen Ma et al.
  • 1Key Laboratory of Marine Environment and Ecology, Ministry of Education/Institute for Advanced Ocean Study, Ocean University of China, Qingdao 266100, China
  • 2Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
  • 3School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332
  • 4Key Laboratory of Physical Oceanography, Ministry of Education/Institute for Advanced Ocean Study, Ocean University of China,Qingdao 266100, China
  • 5Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, Washington, 99354, USA
  • 6Key Lab of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China
  • 7School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China
  • 8Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China
  • 9Anhui Province Key Laboratory of Polar Environment and Global Change, USTC, Hefei, 230026, China
  • 10State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
  • 11Joint Institute for Regional Earth System Science and Engineering and Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA 90095, USA
  • 12Max Planck Institute for Chemistry, Multiphase Chemistry Department, D-55128 Mainz, Germany
  • 13College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China
  • 14Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China

Abstract. In the summer of 2017, heavy ozone pollution swamped most of the North China Plain (NCP), with the maximum regional average of daily maximum 8-h ozone concentration (MDA8) reaching almost 120 ppbv. In light of the continuing reduction of anthropogenic emissions in China, the underlying mechanisms for the occurrences of these regional extreme ozone episodes are elucidated from two perspectives: meteorology and biogenic emissions. The significant positive correlation between MDA8 and temperature, which is amplified during heat waves concomitant with stagnant air and no precipitation, supports the crucial role of meteorology in driving high ozone concentrations. We also find that biogenic emissions are enhanced due to factors previously not considered. During the heavy ozone pollution episodes in June 2017, biogenic emissions driven by high vapor pressure deficit (VPD), land cover change and urban landscape yield an extra mean MDA8 ozone of 3.08, 2.79 and 4.74 ppbv, respectively over the NCP, which together contribute as much to MDA8 ozone as biogenic emissions simulated using the land cover of 2003 and ignoring VPD and urban landscape. In Beijing, the biogenic emission increase due to urban landscape has a comparable effect on MDA8 ozone to the combined effect of high VPD and land cover change between 2003 and 2016. This study highlights the vital contributions of heat waves, land cover change and urbanization to the occurrence of extreme ozone episode, with significant implications for ozone pollution control in a future when heat wave frequency and intensity are projected to increase under global warming.

Mingchen Ma et al.
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Short summary
Ozone pollution has become severe in China, and extremely high ozone episodes occurred in summer 2017 over the North China Plain. While meteorology impacts are clear, we find that enhanced biogenic emissions, previously ignored by the community, driven by high vapor pressure deficit, land cover change and urban landscape contribute substantially to ozone formation. This study has significant implications for ozone pollution control with more frequent heat waves and urbanization growth in future.
Ozone pollution has become severe in China, and extremely high ozone episodes occurred in summer...
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