Trends and Variability of Ozone Pollution over the Mountain-Basin Areas in Sichuan Province during 2013–2020: Synoptic Impacts and Formation Regimes
Open Access
- 25 November 2021
- journal article
- research article
- Published by MDPI AG in Atmosphere
- Vol. 12 (12), 1557
- https://doi.org/10.3390/atmos12121557
Abstract
Sichuan Province, the most industrialized and populated region in southwestern China, has been experiencing severe ozone pollution in the boreal warm season (April–September). With a surface ozone monitoring network and reanalysis dataset, we find that nearly all cities in Sichuan Province showed positive increasing trends in the warm-season ozone levels. The warm-season daily maximum 8-h average (MDA8) ozone levels increased by 2.0 ppb (4.8%) year−1 as a whole, with slightly larger trends in some sites such as a site in Zigong (5.2 ppb year−1). Seasonally, the monthly ozone level in Sichuan peaks from May to August (varies with year). The predominant warm-season synoptic patterns were objectively identified based on concurrent hourly meteorological fields from ERA5. High-pressure systems promote ozone production and result in high ozone concentrations, due to strong solar radiation as well as hot and dry atmospheric conditions. The increased occurrence of high-pressure patterns probably drives the ozone increase in Sichuan. When ozone pollution is relatively weak (with MDA8 ozone around 170 μg m−3), the air quality standard could be achieved in the short term by a 25% reduction of NOx and VOCs emissions. Strengthened emission control is needed when ozone pollution is more severe. Our study provides implications for effective emission control of ozone pollution in Sichuan.Funding Information
- National Natural Science Foundation of China (41905049)
- National Key R&D Program of China (2018YFC0214000, K-2021-006)
This publication has 50 references indexed in Scilit:
- Health Benefits from Large-Scale Ozone Reduction in the United StatesEnvironmental Health Perspectives, 2012
- Long-Term Ozone Exposure and MortalityThe New England Journal of Medicine, 2009
- Classifications of Atmospheric Circulation PatternsAnnals of the New York Academy of Sciences, 2008
- Can principal component analysis provide atmospheric circulation or teleconnection patterns?International Journal of Climatology, 2007
- Decoupled direct 3D sensitivity analysis for particulate matter (DDM-3D/PM)Atmospheric Environment, 2006
- Review of the Governing Equations, Computational Algorithms, and Other Components of the Models-3 Community Multiscale Air Quality (CMAQ) Modeling SystemApplied Mechanics Reviews, 2006
- A circulation classification scheme applicable in GCM studiesTheoretical and Applied Climatology, 2000
- The effects of ozone and NOx on the deterioration of calcareous stoneScience of The Total Environment, 1999
- Fast, Direct Sensitivity Analysis of Multidimensional Photochemical ModelsEnvironmental Science & Technology, 1997
- Atmospheric classifications and synoptic climatologyProgress in Physical Geography: Earth and Environment, 1992