Preprints
https://doi.org/10.5194/acp-2021-814
https://doi.org/10.5194/acp-2021-814

  26 Oct 2021

26 Oct 2021

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

Influence of Photochemical Loss of VOCs on Understanding Ozone Formation Mechanism

Wei Ma1, Zemin Feng1, Junlei Zhan1, Yongchun Liu1, Pengfei Liu2,4,5, Chengtang Liu2,4,5, Qingxin Ma2,4,5, Kang Yang3, Yafei Wang3, Hong He2,4,5, Markku Kulmala1,6, Yujing Mu2,4,5, and Junfeng Liu2,4,5 Wei Ma et al.
  • 1Aerosol and Haze Laboratory, Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China
  • 2Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
  • 3Beijing Institute of Petrochemical Technology, Beijing 102617, China
  • 4Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
  • 5University of Chinese Academy of Sciences, Beijing 100049, China
  • 6Institute for Atmospheric and Earth System Research, Faculty of Science, University of Helsinki, Helsinki, 00014, Finland

Abstract. Volatile organic compounds (VOCs) tend to be consumed by atmospheric oxidants, resulting in substantial photochemical loss during transport. An observation-based model is used to evaluate the influence of photochemical loss of VOCs on the sensitivity regime and mechanisms of ozone formation. Our results showed that a VOC-limited regime based on the observed VOC concentrations shifted to a transition regime with the photochemical initial concentration of VOCs (PIC-VOCs) in the morning. The net ozone formation rate was underestimated by 3 ppb h−1 (36 ppb day−1) based on the PIC-VOCs. The relative contribution of the RO2 path to ozone production based on the PIC-VOCs accordingly increased by 13.4 %, particularly, the contribution of alkenes derived RO2 increased around 10.2 %. The contribution of local photochemistry might be underestimated to both local and regional ozone pollution if the consumed VOCs was not accounted for, and policy-making on ozone pollution prevention should focus on high-reactivity VOCs.

Wei Ma et al.

Status: open (until 07 Dec 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-814', Anonymous Referee #1, 24 Nov 2021 reply
  • RC2: 'Comment on acp-2021-814', Anonymous Referee #2, 28 Nov 2021 reply

Wei Ma et al.

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Short summary
The influence of photochemical loss of VOCs on O3 formation has been investigated by an observation-based model. The sensitivity regime of ozone formation might be misdiagnosed due to the photochemical loss of VOCs in the atmosphere. The contribution of local photochemistry is underestimated to O3 pollution without considering the photochemical loss of VOCs.
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