Preprints
https://doi.org/10.5194/acp-2022-50
https://doi.org/10.5194/acp-2022-50
 
24 Jan 2022
24 Jan 2022
Status: a revised version of this preprint is currently under review for the journal ACP.

Observation-based Analysis of Ozone Production Sensitivity for Two Persistent Ozone Episodes in Guangdong, China

Kaixiang Song1, Run Liu1,2, Yu Wang1,2, Tao Liu1, Liyan Wei1, Yanxing Wu1, Junyu Zheng1,2, Boguang Wang1,2, and Shaw Chen Liu1,2 Kaixiang Song et al.
  • 1Institute for Environmental and Climate Research, Jinan University, Guangzhou, 511443, China
  • 2Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Guangzhou, 511443, China

Abstract. An observation-based method (OBM) is developed to investigate the sensitivity of ozone formation to precursors during two persistent elevated ozone episodes observed at 77 stations in Guangdong. Average OH concentrations derived at the 77 stations between 08:00 and 13:00 local time stay within a narrow range of 2.5 × 106 cm−3 to 5.5 × 106 cm−3 with a weak dependence on the NOx. These values are in good agreement with OH values observed at a rural station in Pearl River Delta (PRD) and a box model constrained by the ambient conditions. They also agree well with a box model constrained by the ambient conditions observed during the two episodes. The OBM has been used to evaluate the ozone production efficiency, ε(NOx or VOC), defined as the number of O3 molecules produced per molecule of NOx (or VOC) oxidized. Average values of ε(NOx) and ε(VOC) determined by the OBM are 3 and 2.1 ppb/ppb, respectively, both compared well with values in previous studies. Approximately 67 % of the station-days exhibit ozone formation sensitivity to NOx, approximately 20 % of the station-days are in the transitional regime sensitive to both NOx and VOC, only approximately 13 % of the station-days are sensitive to VOC. These results are in semi-quantitative agreement with the ozone formation sensitivity calculated by the box model constrained by ambient conditions observed during the two episodes. However, our OBM results differ from those of most previous investigations which suggested that limiting the emission of VOC rather than NOx would be more effective in reducing ozone reduction in Guangdong.

Kaixiang Song 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-2022-50', Anonymous Referee #1, 17 Mar 2022
  • RC2: 'Comment on acp-2022-50', Anonymous Referee #2, 10 Apr 2022

Kaixiang Song et al.

Kaixiang Song et al.

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Short summary
We developed an observation-based method to investigate the sensitivity of ozone formation to precursors during two elevated ozone episodes observed at 77 stations in Guangdong, China. We found approximately 67 % of the station-days exhibit ozone formation sensitivity to NOx, 20 % of the station-days are in the transitional regime sensitive to both NOx and VOC, only 13 % of the station-days are sensitive to VOC.
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