Preprints
https://doi.org/10.5194/acp-2022-716
https://doi.org/10.5194/acp-2022-716
 
01 Nov 2022
01 Nov 2022
Status: this preprint is currently under review for the journal ACP.

Assessment of the impacts of cloud chemistry on surface SO2 and sulfate levels in typical regions of China

Jian-yan Lu1, Sunling Gong1,5, Chun-hong Zhou1, Jian Zhang1, Jian-min Chen2,3,4, and Lei Zhang1 Jian-yan Lu et al.
  • 1State Key Laboratory of Severe Weather, Key Laboratory of Atmospheric Chemistry of CMA, Institute of Atmospheric Composition, Chinese Academy of Meteorological Sciences, Beijing 100081, China
  • 2Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan Tyndall Centre, Institute of Atmospheric Sciences, Fudan University, Shanghai, China
  • 3Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Science, Xiamen, China
  • 4Shanghai Institute of Eco-Chongming (SIEC), No.3663 Northern Zhongshan Road, Shanghai 200062, China
  • 5National Observation and Research Station of Coastal Ecological Environments in Macao, Macao Environmental Research Institute, Macau University of Science and Technology, Macao SAR 999078, China

Abstract. A regional online chemical weather model WRF/ CUACE (China Meteorological Administration Unified Atmospheric Chemistry Environment) was used to assess the contributions of cloud chemistry to the SO2 and sulfate levels in typical regions in China. By comparing with several time series of in-situ cloud chemical observations on Mountain Tai in Shandong Province of China, the CUACE cloud chemistry scheme was found to well reproduce the cloud processing the consumptions of H2O2, O3 and SO2, and consequently was used in the regional assessment for a heavy pollution episode and monthly average in December 2016. During cloud availability in heavy pollution episode, the sulfate production increases 40–80 % and SO2 reduces over 80 %. During the heavy pollution episode, it is found that the cloud chemistry mainly affects the middle and lower troposphere below 5 km as well as within the boundary layer, and contributes significantly to SO2 reduction and sulfate increase in east-central China. Among the regions of North China Plain (NCP), Yangtze River Delta (YRD) and Sichuan Basin (SCB), the SCB is mostly affected by the cloud chemistry, with the average SO2 abatement up to about 1–15 ppb and sulfate increase up to more than 50 μg m-3, followed by YRD where the contribution of cloud chemistry is still significant, averaging up to 1–3 ppb for SO2 abatement and 5–20 μg/m3 for sulfate increase. The cloud chemistry contribution to PRD and NCP are not significant and weaker than other two regions due to lighter pollution and less water vapor, respectively. In addition, the average contribution of cloud chemistry during the pollution period was significantly greater than that for all December. This study provides a way to analyze the over-estimate phenomenon of SO2 in many chemical transport models.

Jian-yan Lu et al.

Status: open (until 13 Dec 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Jian-yan Lu et al.

Jian-yan Lu et al.

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Short summary
A regional online chemical weather model WRF/ CUACE was used to assess the contributions of cloud chemistry to the SO2 and sulfate levels in typical regions in China. The cloud chemistry scheme in CUACE was evaluated, and well reproduces the cloud chemistry processes. During cloud availability in a heavy pollution episode, the sulfate production increases 40–80 % and SO2 reduces over 80 %. This study provides a way to analyze the over-estimate phenomenon of SO2 in many chemical transport models.
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