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Using the hourly atmospheric visibility and relative humidity observations in Chengdu from October to December 2017, along with simultaneous data of black carbon (BC), particulate matter (PM), and nitrogen dioxide (NO2) mass concentrations, the response of aerosol extinction coefficients to the changes of multiple factors was analyzed through correlation analysis, variance inflation factor analysis and the GAM model. The results revealed that the explanatory variable set for aerosol extinction coefficients included ρPM2.5, RH, ρBC/ρPM2.5, ρPM1/ρPM2.5, and ρPM2.5/ρPM10 (where ρBC, ρPM1, ρPM2.5, and ρPM10 represent the mass concentrations of BC, PM1, PM2.5, and PM10, respectively). Each variable demonstrated a significant nonlinear relationship with aerosol extinction coefficients. Compared to traditional bivariate models, the multivariate GAM model incorporating ρPM2.5, RH, ρBC/ρPM2.5, ρPM1/ρPM2.5, and ρPM2.5/ρPM10 as explanatory variables significantly improved simulation accuracy, particularly in reducing high-humidity-related biases. The adjusted R2 values of the GAM models were 0.659, 0.683, 0.738, and 0.938 for slight, light, moderate, and heavy haze conditions, respectively. The coefficient of determination (R2) values were 0.686, 0.737, 0.777, and 0.961, with mean relative errors (MRE) of 0.091, 0.041, 0.071, and 0.016. The above results revealed the complexity of the multifactorial influence of the aerosol extinction coefficient and its intrinsic relationship with the change of haze intensity.
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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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