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Using surface meteorological and air quality observational data and the 5th Generation of ECMWF Reanalysis data（ERA5）, the characteristics of ozone（O3）pollution impact by the sea-land breezes（SLBs）over the Pearl River Estuary（PRE）in 2022 were studied. The results showed that the SLBs days in the seven cities of PRE were at the range of 40~64, and most of SLBs days occurred in spring and autumn. The averaged median of maximum daily 8-hour average of O3（O3-8h）and over-standard rate of regional SLBs days were 141µg/m3 and 38%, respectively, while only 74µg/m3 and 11% were found in non-SLBs days. The averaged O3-8h were 26%, 41% and 29%, respectively, higher in SLBs days than those of non-SLBs days in Zhuhai, Zhongshan and Jiangmen（ZZJ）, the three cities located in the western part of PRE, indicating that the impact of SLBs was the most significant in those areas. The averaged time of peak concentration in SLBs days was 0.5h later than that of non-SLBs days, with 29% increase in averaged peak concentration. When the sea breezes firstly occurred at 17:00 and 18:00, 72% and 41% of the hourly growth rates of ozone concentrations were positive, and the averaged growth rates were 5% and 7% higher, respectively, than those of non-SLBs days. But the growth rates declined obviously 1h after the occurrence of sea breezes. The averaged recirculation factor（RF）of SLBs days was 39% lower than those of north wind days and south wind days. RF of transition periods was 14% and 15% lower than those of land and sea breezes periods, respectively. Besides, compared to non-SLBs over-standard days, RF in SLBs over-standard days was 28%lower. The atmospheric diffusion capability was weakened by the SLBs, and that exacerbated the ozone pollution.
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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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