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Based on high-resolution measurements of aerosol number concentration and meteorological data that had been obtained at Tangkou Meteorological Station on Mts. Huangshan from April to June 2023, the wet scavenging efficiency of submicron aerosol particles (with a particle diameter range of 0.01~1μm) across the four modes (nucleation mode, Aitken mode, condensation mode, and droplet mode) and its influencing factors were analyzed in this study. The results showed that the number concentration of submicron aerosol particles on precipitation days was averagely 27.8% lower as compared to non-precipitation days (the difference even reached 36.32% for particles in the diameter range of 0.1~1μm), and the scavenging efficiency was found to increase with aerosol particle size. It was also shown that the differences in precipitation intensity influenced the scavenging efficiency of different size particles differently. During light rainfall events, the impact of precipitation intensity on the removal rate of particles larger than 0.1μm was observed to weaken as particle size increased, whereas heavy rain was found to exhibit a higher overall removal efficiency as compared to moderate rain. The scavenging effect was found to vary with initial particle concentration and precipitation duration: Under high initial concentrations, the removal efficiency of particles larger than 0.03μm was shown to increase significantly, while prolonged precipitation (39h) was found to enhance the scavenging effect across all four modes. At different stages of the precipitation process, the removal and resuspension of smaller particles (with a particle size<0.1μm) were determined to be correlated with temperature and local wind speed at the beginning and end of precipitation events. Accumulation-mode particles (0.1~1μm) were more effectively removed during the periods of high rainfall intensity, with particles larger than 0.6μm being observed to show no significant concentration rebound after precipitation. This study revealed the efficiency of precipitation in removing submicron aerosols and its environmental dependence, and provided theoretical support for understanding the wet removal mechanism of atmospheric aerosols.
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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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