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Outline
Under the unique topographic conditions of a deep basin, the Sichuan Basin was characterized by distinct air pollution complex patterns. A typical air pollution complex event and its meteorological drivers in the Sichuan Basin during spring 2024 were investigated, based on air pollutant monitoring data and ERA5 meteorological reanalysis. The results demonstrate that: (1) The southern part of the basin, particularly the region encompassing Yibin, Zigong, and Luzhou, was identified as a high-incidence area for air pollution complex of O3 and PM2.5. From March 22 to 24, 2024, the average near-surface maximum daily 8-h average (MDA8) O3 and daily average PM2.5 concentrations in these three cities were measured at 196.3μg/m3 and 66.6μg/m3, respectively, and synchronous variations in near-surface O3 and PM2.5 concentrations were observed. This episode was characterized as a typical air pollution complex event in southern Sichuan, with concurrently high levels of both O3 and PM2.5 (a "dual-high" pattern). (2) Compared to the same period in 2021~2023, the averages of near-surface O3 and PM2.5 concentrations in these three cities during March 22~24, 2024, were found to be abnormally elevated by 83.4μg/m3 (99.6%) and 26.9μg/m3 (77.3%), respectively, indicating an unusually anomalous spring air pollution complex event. (3) The typical air pollution complex of O3 and PM2.5 was significantly influenced by meteorological conditions. Local high air temperatures and strong solar radiation were identified as factors that promoted photochemical O3 generation and secondary PM2.5 formation. Additionally, the convergence of northeasterly surface winds from the basin at the southern edge of the Sichuan Basin was observed to exacerbate the local accumulation of air pollutants. Through this case study, the unique characteristics and meteorological mechanisms of air pollution complex of O3 and PM2.5 in the Sichuan Basin were elucidated, providing scientific support for regional joint prevention and control strategies.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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