海陆风对环珠江口地区臭氧污染的影响

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Abstract Using surface meteorological and air quality observational data and the 5^th 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.

Key words： sea-land breezes Pearl River Estuary ozone pollution recirculation factor

Received: 02 August 2024

PACS:

X51

Corresponding Authors: 邓涛,研究员,tdeng@gd121.cn E-mail: tdeng@gd121.cn

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	MAI Jian-hua
	YU Ling-ling
	DENG Tao
	WU Dao-hang
	QING Peng-cheng
	YU Xin-yang

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MAI Jian-hua,YU Ling-ling,DENG Tao等. Impact of sea-land breezes on the ozone pollution over the Pearl River Estuary[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(3): 1198-1209.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I3/1198

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