Preprints
https://doi.org/10.5194/acp-2020-1298
https://doi.org/10.5194/acp-2020-1298

  25 Feb 2021

25 Feb 2021

Review status: a revised version of this preprint is currently under review for the journal ACP.

OMI-observed HCHO in Shanghai, China during 2010–2019 and ozone sensitivity inferred by improved HCHO / NO2 ratio

Danran Li1, Shanshan Wang1,2, Ruibin Xue1, Jian Zhu1, Sanbao Zhang1, Zhibin Sun1, and Bin Zhou1,2,3 Danran Li et al.
  • 1Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan University, Shanghai, China
  • 2Institute of Eco-Chongming (IEC), No. 20 Cuiniao Road, Shanghai 202162, China
  • 3Institute of Atmospheric Sciences, Fudan University, Shanghai, 200433, China

Abstract. In recent years, satellite remote sensing has been increasingly used in the long-term observation of ozone (O3) precursors and its formation regime. In this work, formaldehyde (HCHO) data from Ozone Monitoring Instrument (OMI) were used to analyse the temporal and spatial distribution of HCHO vertical column densities (VCDs) in Shanghai from 2010 to 2019. HCHO VCDs exhibited the highest value in summer and the lowest in winter, the high-VCD concentrated in western Shanghai. Temperature largely influence HCHO by affecting the biogenic emissions and photochemical reactions, and industry was the major anthropogenic source. The satellite observed formaldehyde to nitrogen dioxide ratio (FNRSAT) reflects that the O3 formation regime had significant seasonal characteristics and gradually manifested as transitional ozone formation regime dominated in Shanghai. The uneven distribution in space was mainly reflected as the higher FNRSAT and surface O3 concentration in rural area. To compensate the shortcoming of FNRSAT that it can only characterize O3 formation around satellite overpass time, correction of FNRSAT was implemented with hourly surface FNR and O3 data. After correction, O3 formation regime showed the trend moving towards VOC-limited in both time and space, and regime indicated by FNRSAT can better reflect O3 formation for a day. This study can help us better understand HCHO characteristics and O3 formation regime in Shanghai, and also provide a method to improve FNRSAT for characterizing O3 formation in a day, which will be significant for developing O3 prevention and control strategies.

Danran Li et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2020-1298', Anonymous Referee #2, 05 Apr 2021
  • RC2: 'Comment on acp-2020-1298', Anonymous Referee #1, 09 May 2021

Danran Li et al.

Danran Li et al.

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