Preprints
https://doi.org/10.5194/acp-2022-479
https://doi.org/10.5194/acp-2022-479
 
23 Aug 2022
23 Aug 2022
Status: this preprint is currently under review for the journal ACP.

Ozone pollution in China affected by stratospheric quasi-biennial oscillation

Mengyun Li1, Yang Yang1, Hailong Wang2, Huimin Li1, Pinya Wang1, and Hong Liao1 Mengyun Li et al.
  • 1Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing, Jiangsu, China
  • 2Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, Washington, USA

Abstract. In recent years, near-surface ozone (O3) level has been rising fast in China, with increasing damages to human health and ecosystems. In this study, the impact of stratospheric quasi-biennial oscillation (QBO) on interannual variations in summertime tropospheric O3 over China is investigated based on GEOS-Chem model simulations and satellite retrievals. QBO has a significant positive correlation with near-surface O3 concentrations over central China (92.5°–112.5° E, 26°–38° N) when the sea surface temperature (SST) over the eastern tropical Pacific is warmer than normal, with a correlation coefficient of 0.53, but QBO has no significant effect on O3 under the cold SST anomaly. Compared to the easterly phase of QBO, the near-surface O3 concentrations have an increase of up to 3 ppb (5 % relative to the average) over central China during its westerly phase under the warm SST anomaly. O3 also increases above the surface and up to the upper troposphere, with a maximum increase of 2–3 ppb (3–5 %) in 850–500 hPa over central China comparing westerly phase to easterly phase. Process-based analysis and sensitivity simulations suggest that the O3 increase over central China is mainly attributed to the anomalous downward transport of O3 during the westerly phase of QBO when a warm SST anomaly occurs in the eastern tropical Pacific, while the local chemical reactions and horizontal transport processes partly offset the O3 increase. This work suggests a potentially important role of QBO and the related vertical transport process in affecting near-surface O3 air quality, with an indication for O3 pollution prediction and prevention.

Mengyun Li et al.

Status: open (until 04 Oct 2022)

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Mengyun Li et al.

Mengyun Li et al.

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Short summary
Using the GEOS-Chem model, the impact of Quasi-Biennial Oscillation (QBO) on summertime tropospheric O3 in China has been investigated. In the warm phases of sea surface temperature anomalies over the eastern tropical Pacific, QBO has a significant positive correlation with near-surface O3 concentrations over central China. The QBO impacts on O3 pollution in China mainly through changing vertical transport of O3.
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