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As a key determinant of atmospheric oxidation capacity, the hydroxyl radicals (·OH) govern the removal of primary pollutants and the formation of secondary pollutants. This study estimated ·OH levels from 2015 to 2023 using a parameterization approach based on surface air pollutant observations and reanalysis meteorological data. The results showed that daytime ·OH concentration (08:00~18:00) exhibited a single-peak seasonal pattern, with the highest levels occurring in summer and the lowest in winter. The annual mean daytime ·OH concentration displayed a significant upward trend (0.05×106cm-3a-1). Spatially, the most rapid increases were found in Handan and Tangshan, while Tianjin exhibited relatively smaller increases. Among seasons, the summertime trend was the most pronounced (0.07×106cm-3a-1). At present, ·OH concentrations in the BTH region lie on the declining branch of the nonlinear response curve to nitrogen dioxide (NO2). Under the present NO2 levels, continued reductions in NO2 weaken the dominant ·OH sink reactions, constituting the key chemical mechanism driving the net increase in ·OH concentrations.
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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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