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Outline
Given the ozone (O3) pollution events in the Pearl River Delta (PRD) region frequently occur in autumn and the increasing application of objective weather classification methods in urban agglomeration pollution studies, this study employed the Self-Organizing Map (SOM) method to classify the sea level pressure fields in the PRD and to investigate the impacts of different weather patterns on severe autumn O3 pollution. The results indicated that 15weather patterns identified from sea level pressure fields could be categorized into four groups based on O3 pollution levels: heavy pollution, moderate pollution, light pollution, and clean. Among them, heavy and moderate pollution weather patterns exhibited distinct seasonal distributions, with the weak cold high-pressure combined with typhoon and subtropical high pattern (T12) (The average O3 concentration was 118.2 μg/m3, with an exceedance rate of 22.4%) was associated with the most severe O3 pollution. Autumn O3 exceedance days under heavy pollution patterns were generally accompanied by high solar radiation (554.1kJ/m2 above the mean), high temperature (3.1℃ above the mean), and low relative humidity (9.2% below the mean), which were highly favorable for O3 formation. Using the circulation field of heavy pollution weather patterns with autumn O3 exceedance day as a reference, the study found that the number of days favorable for O3 exceedance during 2015~2024 was significantly correlated with autumn O3 concentration. Furthermore, the number of favorable days under similar circulation conditions showed a significant increasing trend during 1995~2060 (with an average growth rate of 0.14d/a).
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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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