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Recent-year variations in O3 pollution with high-temperature suppression over central China
Weikang Fu1, Tianliang Zhao1, Xiaoyun Sun2
1Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory of Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing, 210044, China.
Environmental Pollution (Barking, Essex : 1987)
|April 7, 2024
Summary
Ozone pollution is worsening in China's Twain-Hu Basin, with higher temperatures leading to ozone suppression. This trend varies across urban and mountainous regions, impacting pollution control strategies.
Area of Science:
- Environmental Science
- Atmospheric Chemistry
- Climate Science
Background:
- The Twain-Hu Basin (THB) in central China has emerged as a significant regional ozone (O3) pollution center.
- Recent years (2015-2022) show the highest increasing trend in O3 concentrations in the THB at 1.10 % yr-1.
- O3 pollution has been deteriorating in recent years within the THB.
Purpose of the Study:
- To investigate the spatiotemporal variations of O3 pollution in the THB.
- To explore the phenomenon of ozone suppression (OS) under high air temperatures across different geographical areas (metropolitan, small urban, mountainous).
- To understand the relationship between meteorological drivers and O3 pollution trends.
Main Methods:
- Analysis of environmental and meteorological monitoring data from 2015-2022.
- Examination of interannual trends in O3 concentrations, specifically the 90th percentile of daily maximum 8-h (MDA8-90) O3 concentrations.
- Identification of inflection points for OS and estimation of OS intensity in relation to air temperature across different area types.
Main Results:
- Bipolarized interannual trends were observed: increasing MDA8-90 O3 in polluted urban areas and decreasing MDA8-90 O3 in clean mountainous areas.
- Inflection points for OS were identified at 30.5°C (mountainous), 32.5°C (small urban), and 34.5°C (metropolitan).
- The intensity of OS was ranked: mountainous areas (-2.30 μg m-3 °C-1) > small urban areas (-1.96 μg m-3 °C-1) > metropolitan areas (-1.54 μg m-3 °C-1), with OS being more significant in lower-O3 mountainous regions.
Conclusions:
- Ozone pollution dynamics in the THB are complex, exhibiting distinct trends in urban versus mountainous areas.
- High air temperatures trigger ozone suppression, with varying temperature thresholds and intensity across different landscapes.
- Understanding these meteorological drivers is crucial for effective O3 pollution management and policy development in the region.
