Preprints
https://doi.org/10.5194/egusphere-2023-2723
https://doi.org/10.5194/egusphere-2023-2723
27 Nov 2023
 | 27 Nov 2023

Aggravated surface O3 pollution primarily driven by meteorological variation in China during the early COVID-19 pandemic lockdown period

Zhendong Lu, Jun Wang, Yi Wang, Daven K. Henze, Xi Chen, Tong Sha, and Kang Sun

Abstract. Due to the lockdown during the COVID-19 pandemic in China from late January to early April in 2020, a significant reduction of primary air pollutants has been identified by satellite and ground observations. However, this reduction is in contrast with the increase of surface O3 concentration in many parts of China during the same period. The reasons for this contrast are studied here from two perspectives: emission changes and inter-annual meteorological variations. Based on top-down constraints of NOx emissions from TROPOMI measurements and GEOS-Chem model simulations, our analysis reveals that NOx and volatile organic compound (VOC) emission reductions as well as meteorological variations lead to 8 %, -3 %, and 1 % changes in O3 over North China, respectively. In South China, however, we find that meteorological variations cause ~30 % increases in O3, which is much larger than -1 % and 2 % changes due to VOC and NOx emission reductions, respectively, and the overall O3 increase is consistent with the surface observations. The higher temperature is the main reason that leads to the surface O3 increase in South China. Overall, inter-annual meteorological variations have a larger impact than emission reductions on the aggravated surface O3 pollution in China during the early lockdown period of COVID-19 pandemic.

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Journal article(s) based on this preprint

10 Jul 2024
Aggravated surface O3 pollution primarily driven by meteorological variations in China during the 2020 COVID-19 pandemic lockdown period
Zhendong Lu, Jun Wang, Yi Wang, Daven K. Henze, Xi Chen, Tong Sha, and Kang Sun
Atmos. Chem. Phys., 24, 7793–7813, https://doi.org/10.5194/acp-24-7793-2024,https://doi.org/10.5194/acp-24-7793-2024, 2024
Short summary
Zhendong Lu, Jun Wang, Yi Wang, Daven K. Henze, Xi Chen, Tong Sha, and Kang Sun

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-2723', Anonymous Referee #1, 11 Dec 2023
    • AC1: 'Reply on RC1', Zhendong Lu, 21 Apr 2024
  • RC2: 'Comment on egusphere-2023-2723', Anonymous Referee #2, 29 Feb 2024
    • AC2: 'Reply on RC2', Zhendong Lu, 21 Apr 2024

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2023-2723', Anonymous Referee #1, 11 Dec 2023
    • AC1: 'Reply on RC1', Zhendong Lu, 21 Apr 2024
  • RC2: 'Comment on egusphere-2023-2723', Anonymous Referee #2, 29 Feb 2024
    • AC2: 'Reply on RC2', Zhendong Lu, 21 Apr 2024

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
AR by Zhendong Lu on behalf of the Authors (22 Apr 2024)  Author's response   Author's tracked changes   Manuscript 
ED: Publish subject to minor revisions (review by editor) (04 May 2024) by Hang Su
AR by Zhendong Lu on behalf of the Authors (12 May 2024)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (18 May 2024) by Hang Su
AR by Zhendong Lu on behalf of the Authors (20 May 2024)

Journal article(s) based on this preprint

10 Jul 2024
Aggravated surface O3 pollution primarily driven by meteorological variations in China during the 2020 COVID-19 pandemic lockdown period
Zhendong Lu, Jun Wang, Yi Wang, Daven K. Henze, Xi Chen, Tong Sha, and Kang Sun
Atmos. Chem. Phys., 24, 7793–7813, https://doi.org/10.5194/acp-24-7793-2024,https://doi.org/10.5194/acp-24-7793-2024, 2024
Short summary
Zhendong Lu, Jun Wang, Yi Wang, Daven K. Henze, Xi Chen, Tong Sha, and Kang Sun
Zhendong Lu, Jun Wang, Yi Wang, Daven K. Henze, Xi Chen, Tong Sha, and Kang Sun

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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

Short summary
In contrast with the past work showing the reduction of emission as the dominant factor for nation-wide increase of surface O3 during the lockdown in China, this study finds that the variation in meteorology (temperature and other parameters) plays a more important role. This result is obtained through sensitivity simulations using a chemical transport model constrained by satellite (TROPOMI) and calibrated with surface observation.