29 Oct 2021

29 Oct 2021

Review status: this preprint is currently under review for the journal ACP.

Atmospheric oxidation capacity and ozone pollution mechanism in a coastal city of Southeast China: Analysis of a typical photochemical episode by Observation-Based Model

Taotao Liu1,2,3, Youwei Hong1,2, Mengren Li1,2, Lingling Xu1,2, Jinsheng Chen1,2, Yahui Bian1,2, Chen Yang1,2,3, Yangbin Dan1,2, Yingnan Zhang4, Likun Xue4, Min Zhao4, Zhi Huang5, and Hong Wang6 Taotao Liu et al.
  • 1Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China
  • 2Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China
  • 3University of Chinese Academy of Sciences, Beijing, China
  • 4Environment Research Institute, Shandong University, Jinan, Shandong, China
  • 5Xiamen Institute of Environmental Science, Xiamen, China
  • 6Fujian Meteorological Science Institute, Fujian Key Laboratory of Severe Weather, Fuzhou, China

Abstract. A typical multi-day ozone (O3) pollution event was chosen to explore the atmospheric oxidation capacity (AOC), OH reactivity, radical chemistry, and O3 pollution mechanism in a coastal city of Southeast China, with an Observation-Based Model coupled to the Master Chemical Mechanism (OBM-MCM). The hydroxyl radical (OH) was the predominant oxidant (91±23 %) for daytime AOC, while NO3 radical played an important role for AOC during the nighttime (64±11 %). Oxygenated volatile organic compounds (OVOCs, 30±8 %), NO2 (29±8 %) and CO (25±5 %) were the dominant contributors to OH reactivity, accelerating the production of O3 and recycling of ROx radicals (ROx=OH+HO2+RO2). Photolysis of nitrous acid (HONO, 33±14 %), O3 (25±13 %), formaldehyde (HCHO, 20±5 %), and other OVOCs (17±2 %) were the important primary sources of ROx radicals, which played initiation roles in atmospheric oxidation processes. O3 formation was VOC-sensitive, and controlling emissions of aromatics, alkenes, and long-chain alkanes were benefit for ozone pollution mitigation. Combined with regional transport analysis, the reasons for this O3 episode were the accumulation of local photochemical production and regional transport. The results of sensitivity analysis showed that VOCs were the limiting factor of radical recycling and O3 formation, and the 5 % reduction of O3 would be achieved by decreasing 20 % anthropogenic VOCs. The findings of this study have significant guidance for emission reduction and regional collaboration on future photochemical pollution control in the relatively clean coastal cities of China and similar countries.

Taotao Liu et al.

Status: open (until 10 Dec 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-764', Anonymous Referee #2, 15 Nov 2021 reply

Taotao Liu et al.


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Short summary
Based on the OBM-MCM model analyses, the study aims to clarify (1) the pollution characteristics of O3 and its precursors, (2) the atmospheric oxidation capacity and radical chemistry, and (3) the O3 formation mechanism and sensitivity analysis. The results are expected to enhance the understanding of O3 formation mechanism with low O3 precursor levels, and provide scientific evidence for O3 pollution control in the coastal cities.