Mechanisms of O3 and PM2.5 evolution along the cold wave passage in Eastern China
Abstract Cold wave (CW) systems in China, driven by strong northerly winds, typically clean the atmosphere but can also transport pollutants. However, elevated PM2.5 and O3 levels often precede CW events, with key processes remaining unclear. This study analyzes over 2000 in-situ observations (2014–...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-05-01
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| Series: | npj Climate and Atmospheric Science |
| Online Access: | https://doi.org/10.1038/s41612-025-01088-8 |
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| author | Min Shao Changhui Xu Shun Lv Xueren Jin Qing Mu Jialei Zhu |
| author_facet | Min Shao Changhui Xu Shun Lv Xueren Jin Qing Mu Jialei Zhu |
| author_sort | Min Shao |
| collection | DOAJ |
| description | Abstract Cold wave (CW) systems in China, driven by strong northerly winds, typically clean the atmosphere but can also transport pollutants. However, elevated PM2.5 and O3 levels often precede CW events, with key processes remaining unclear. This study analyzes over 2000 in-situ observations (2014–2022), atmospheric reanalysis, and WRF-CAMx simulations to examine CW impacts on air pollution over eastern China. A three-day compressional heating period before CW events alters planetary boundary layer (PBL) dynamics, influencing pollutant levels. PM2.5 is driven by wind speed, PBL height (PBLH), and mean sea level pressure (MSLP), while O3 is influenced by temperature, humidity, solar radiation, PBLH, and MSLP. Though CWs generally clean the air on the day of its arrival, ~18% of cases show increased PM2.5 due to enhanced secondary formation and suppressed PBLH. Numerical simulations reveal CW-induced long-range pollutant transport and highlight critical meteorological-pollution interactions before CW events. |
| format | Article |
| id | doaj-art-903d8aabb44748eb8a3eac7202573be7 |
| institution | Kabale University |
| issn | 2397-3722 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Climate and Atmospheric Science |
| spelling | doaj-art-903d8aabb44748eb8a3eac7202573be72025-08-20T03:48:18ZengNature Portfolionpj Climate and Atmospheric Science2397-37222025-05-018111410.1038/s41612-025-01088-8Mechanisms of O3 and PM2.5 evolution along the cold wave passage in Eastern ChinaMin Shao0Changhui Xu1Shun Lv2Xueren Jin3Qing Mu4Jialei Zhu5School of Environment, Nanjing Normal UniversitySchool of Environment, Nanjing Normal UniversitySchool of Environment, Nanjing Normal UniversitySchool of Environment, Nanjing Normal UniversityDepartment of Health and Environmental Sciences, Xi’an Jiaotong-Liverpool UniversityInstitute of Surface-Earth System Science, School of Earth System Science, Tianjin UniversityAbstract Cold wave (CW) systems in China, driven by strong northerly winds, typically clean the atmosphere but can also transport pollutants. However, elevated PM2.5 and O3 levels often precede CW events, with key processes remaining unclear. This study analyzes over 2000 in-situ observations (2014–2022), atmospheric reanalysis, and WRF-CAMx simulations to examine CW impacts on air pollution over eastern China. A three-day compressional heating period before CW events alters planetary boundary layer (PBL) dynamics, influencing pollutant levels. PM2.5 is driven by wind speed, PBL height (PBLH), and mean sea level pressure (MSLP), while O3 is influenced by temperature, humidity, solar radiation, PBLH, and MSLP. Though CWs generally clean the air on the day of its arrival, ~18% of cases show increased PM2.5 due to enhanced secondary formation and suppressed PBLH. Numerical simulations reveal CW-induced long-range pollutant transport and highlight critical meteorological-pollution interactions before CW events.https://doi.org/10.1038/s41612-025-01088-8 |
| spellingShingle | Min Shao Changhui Xu Shun Lv Xueren Jin Qing Mu Jialei Zhu Mechanisms of O3 and PM2.5 evolution along the cold wave passage in Eastern China npj Climate and Atmospheric Science |
| title | Mechanisms of O3 and PM2.5 evolution along the cold wave passage in Eastern China |
| title_full | Mechanisms of O3 and PM2.5 evolution along the cold wave passage in Eastern China |
| title_fullStr | Mechanisms of O3 and PM2.5 evolution along the cold wave passage in Eastern China |
| title_full_unstemmed | Mechanisms of O3 and PM2.5 evolution along the cold wave passage in Eastern China |
| title_short | Mechanisms of O3 and PM2.5 evolution along the cold wave passage in Eastern China |
| title_sort | mechanisms of o3 and pm2 5 evolution along the cold wave passage in eastern china |
| url | https://doi.org/10.1038/s41612-025-01088-8 |
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