24 Aug 2021

24 Aug 2021

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

Dipole Pattern of Summer Ozone Pollution in the east of China and Its Connection with Climate Variability

Xiaoqing Ma1 and Zhicong Yin1,2,3 Xiaoqing Ma and Zhicong Yin
  • 1Key Laboratory of Meteorological Disaster, Ministry of Education/Joint International Research Laboratory of Climate and Environment Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science & Technology, Nanjing 210044, China
  • 2Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China
  • 3Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China

Abstract. Surface O3 pollution has become one of the most severe air pollution problems in China, which makes it of practical importance to understand O3 variability. A south-north dipole pattern of summer-mean O3 concentration in the east of China (DP-O3), which were centered at North China (NC) and the Pearl River Delta (PRD) respectively, has been identified from the simulation of a global 3-D chemical transport model for the period 1980–2019. Large-scale anticyclonic (cyclonic) and cyclonic (anticyclonic) anomalies over NC and the PRD resulted in a sharp contrast of meteorological conditions between the above two regions. The enhanced (restrained) photochemistry and natural emissions of O3 precursors in NC and restrained (enhanced) O3 production in the PRD contributed to the DP-O3. Decreased sea ice anomalies near the Franz Josef Land and associated warm sea surface in May enhanced the Rossby-wave source over northern Europe and West Siberia, which eventually induced an anomalous Eurasia-like pattern to influence the formation of the DP-O3. The thermodynamic signals of the southern Indian Ocean dipole were stored in the subsurface and influenced spatial pattern of O3 pollution in the east of China mainly through the Hadley circulation. The physical mechanisms behind the modulation of the atmospheric circulations and related DP-O3 by these two climate anomalies at different latitudes were evidently verified by large-scale ensemble simulations of the earth system model.

Xiaoqing Ma and Zhicong Yin

Status: open (until 05 Oct 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-613', Anonymous Referee #1, 16 Sep 2021 reply

Xiaoqing Ma and Zhicong Yin

Data sets

Hourly O3 concentration data Ministry of Environmental Protection of China

Sea surface temperature and Sea ice concentration data Met Office Hadley Centre

Xiaoqing Ma and Zhicong Yin


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Short summary
Severe ozone pollution frequently occurred in the east of China and obviously damages human health. The meteorological conditions effectively affect the variations in ozone pollution by modulating the natural emissions of ozone precursors and photochemical reactions in the atmosphere. In this study, a south-north dipole pattern of summer-mean ozone concentration in the east of China was identified and its connections with preceding climate variability at different latitudes were also examined.