Full
Outline
To investigate the causes of ozone (O3) pollution in the Pearl River Delta (PRD) region under non-high-temperature conditions, this study analyzed differences in O3 pollution characteristics between high-temperature days (daily maximum temperature ≥28℃) and non-high-temperature days (daily maximum temperature <28℃) using air quality and meteorological data from 2015 to 2023. The key findings are as follows: O3 pollution in the PRD primarily occurred on high-temperature days, yet 17.2% of total polluted cities were observed during non-high-temperature days. High-temperature pollution was concentrated in central and southwestern PRD, while non-high-temperature pollution predominantly occurred in the southwest. Non-high-temperature O3 pollution typically occurred under conditions of daily maximum temperature (25.0~27.2℃), relative humidity (44.9%~56.8%), and sunshine duration (7.7~9.8h). Compared to high-temperature pollution days, non-high-temperature pollution days exhibited 6.0% lower relative humidity and a more concentrated distribution of sunshine duration in higher intervals. The SHAP method demonstrated that relative humidity is the most influential meteorological factor affecting O3 concentrations. On high-temperature days and non-high-temperature days, the contribution of relative humidity to the O3_8h concentration can reach up to 30 and 60μg/m3, respectively. Low relative humidity (<65%) paired with prolonged sunshine duration synergistically promoted O3 formation, whereas high relative humidity (>65%) combined with reduced sunshine suppressed it. Additionally, the pronounced impact of sunshine duration under non-high-temperature conditions highlights sufficient solar radiation as a prerequisite for O3 generation. Under non-high-temperature conditions, NO2 exerts a weaker influence on O3 concentrations compared to high-temperature days, with its contribution to O3 concentration variations quantified at approximately 15 μg/m3.
79
18
| 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 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62662699(Operation and Technical Support)
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
