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Outline
Due to the unclear evolution characteristics of single high-temperature event days (OHT days), single stagnation event days (OAS days), and their compound event days (HT-AS days) and their impact mechanisms on O3 pollution, based on hourly O3 concentration and meteorological reanalysis data in the warm season (May to September) of the Beijing-Tianjin-Hebei (BTH) region from 2015 to 2024, the interannual variation characteristics of the three types of meteorological event days were systematically analyzed, and the response degree of O3 pollution to these three types of event days was evaluated. Results show that the daily maximum 8-hour average O3 concentration (MDA8O3) during HT-AS event days, OHT event days, OAS event days, and other event days reached (195.3±32.5), (185.1±37.1), (151.9±33.8) and (136.6±34.1)μg/m3, respectively. On an interannual scale, the frequency of HT-AS compound event days was significantly positively correlated with both the number of O3 exceedance days (MDA8O3≥160 μg/m3) and the regional average O3 concentration, with correlation coefficients of 0.65 and 0.66, respectively. This indicates that such compound event days are the primary meteorological drivers of interannual O3 pollution variability in this region. Compared with OHT and OAS event days, HT-AS event days are characterized by more unfavorable meteorological conditions, including intense solar radiation, high temperatures, low cloud cover, and weak winds, constituting the key meteorological background for O3 pollution formation in BTH. During these days, O3 concentration is significantly modulated by solar radiation, temperature and cloud cover contributing 37.5%, 21.0% and 20.2% to O3 variability, respectively.
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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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