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Based on observational data of carbonaceous aerosols collected in Chengdu from June 15, 2020 to April 15, 2022, this study analyzed the temporal variation characteristics of their concentrations and optical properties, and explored the influence of different pollution processes on carbonaceous aerosol levels. The results show that the diurnal variations of carbonaceous aerosol components exhibited distinct bimodal patterns, primarily influenced by traffic rush hours and the development of the planetary boundary layer. The mass concentrations of total carbon (mTC), elemental carbon (mEC), and organic carbon (mOC) peaked in winter, with average values of 8.8 ± 6.4, 2.8 ± 2.1, and 6.0 ± 4.5 μg/m3, respectively, and were lowest in summer. During winter, the mean values of the mass ratio of OC to EC (mOC/mEC:2.8 ± 0.9), the absorption Ångström exponent (α:1.5), and the contribution of brown carbon (BrC) to total absorption at 370nm (PErC:34 ± 19%) all reached their seasonal maxima. Statistical analysis of the relationship between carbonaceous aerosol components and pollution levels indicates that air pollution in Chengdu is mainly driven by the accumulation and aging of primary emissions under stagnant meteorological conditions. As pollution becomes more severe, the proportion of primary components in carbonaceous aerosols increases. Firework emissions during the Spring Festival were found to increase the contribution of BrC, while emissions and accumulation from motor vehicles led to an increased contribution of black carbon (BC). The relative contribution of BC can serve as an indicator of primary emission accumulation and subsequent aging processes during pollution events. This study provides valuable data support for expanding the carbonaceous aerosol database in Chengdu and for understanding the formation mechanism of wintertime compound pollution in the region.
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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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