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Volume 18, issue 19
Atmos. Chem. Phys., 18, 14569-14583, 2018
https://doi.org/10.5194/acp-18-14569-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue: Quadrennial Ozone Symposium 2016 – Status and trends...

Atmos. Chem. Phys., 18, 14569-14583, 2018
https://doi.org/10.5194/acp-18-14569-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 11 Oct 2018

Research article | 11 Oct 2018

Ozone seasonal evolution and photochemical production regime in the polluted troposphere in eastern China derived from high-resolution Fourier transform spectrometry (FTS) observations

Youwen Sun1, Cheng Liu1,2,3,4, Mathias Palm5, Corinne Vigouroux6, Justus Notholt5, Qihou Hu1, Nicholas Jones7, Wei Wang1, Wenjing Su2, Wenqiang Zhang2, Changong Shan1, Yuan Tian1, Xingwei Xu1, Martine De Mazière6, Minqiang Zhou6, and Jianguo Liu1 Youwen Sun et al.
  • 1Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
  • 2School of Earth and Space Sciences, University of Science and Technology of China, Hefei, 230026, China
  • 3Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China
  • 4Anhui Province Key Laboratory of Polar Environment and Global Change, USTC, Hefei, 230026, China
  • 5University of Bremen, Institute of Environmental Physics, P.O. Box 330440, 28334 Bremen, Germany
  • 6Royal Belgian Institute for Space Aeronomy (BIRA-IASB), Brussels, Belgium
  • 7School of Chemistry, University of Wollongong, Northfields Ave, Wollongong, NSW, 2522, Australia

Abstract. The seasonal evolution of O3 and its photochemical production regime in a polluted region of eastern China between 2014 and 2017 has been investigated using observations. We used tropospheric ozone (O3), carbon monoxide (CO), and formaldehyde (HCHO, a marker of VOCs (volatile organic compounds)) partial columns derived from high-resolution Fourier transform spectrometry (FTS); tropospheric nitrogen dioxide (NO2, a marker of NOx (nitrogen oxides)) partial column deduced from the Ozone Monitoring Instrument (OMI); surface meteorological data; and a back trajectory cluster analysis technique. A broad O3 maximum during both spring and summer (MAM/JJA) is observed; the day-to-day variations in MAM/JJA are generally larger than those in autumn and winter (SON/DJF). Tropospheric O3 columns in June are 1.55×1018moleculescm−2 (56DU (Dobson units)), and in December they are 1.05×1018moleculescm−2 (39 DU). Tropospheric O3 columns in June were  ∼ 50% higher than those in December. Compared with the SON/DJF season, the observed tropospheric O3 levels in MAM/JJA are more influenced by the transport of air masses from densely populated and industrialized areas, and the high O3 level and variability in MAM/JJA is determined by the photochemical O3 production. The tropospheric-column HCHO∕NO2 ratio is used as a proxy to investigate the photochemical O3 production rate (PO3). The results show that the PO3 is mainly nitrogen oxide (NOx) limited in MAM/JJA, while it is mainly VOC or mixed VOC–NOx limited in SON/DJF. Statistics show that NOx-limited, mixed VOC–NOx-limited, and VOC-limited PO3 accounts for 60.1%, 28.7%, and 11% of days, respectively. Considering most of PO3 is NOx limited or mixed VOC–NOx limited, reductions in NOx would reduce O3 pollution in eastern China.

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The seasonal evolution of O3 and its photochemical production regime in a polluted region of eastern China between 2014 and 2017 was investigated using FTS observations. We observed a broad summer O3 maximum in Hefei, China, and the ozone production is mainly NOx limited in spring and summer and is mainly VOC or mixed VOC–NOx limited in autumn and winter.
The seasonal evolution of O3 and its photochemical production regime in a polluted region of...
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