气候变化领域集成服务门户(CCPortal): Influence of Wind Flows on Surface O3 Variation over a Coastal Province in Southeast China

CCPortal

DOI	10.3390/atmos15030262
	Influence of Wind Flows on Surface O3 Variation over a Coastal Province in Southeast China
	Shen, Yukun; Liu, Jane; Chen, Zhixiong; Yang, Mengmiao; Shu, Lei; Gai, Chende; Jiang, Yongcheng
发表日期	2024
EISSN	2073-4433
起始页码	15
结束页码	3
卷号	15 期号:3
英文摘要	Surface ozone (O-3) is influenced not only by anthropogenic emissions but also by meteorological factors, with wind direction being one of the most overlooked factors. Here, we combine the observational data of both O-3 and wind flow to compare the variation in surface O-3 with wind direction between coastal and inland regions of Fujian, a province in the southeast coast of China with complicated topography. We further conduct a numerical simulation using a global chemical transport model, GEOS-Chem, to interpret the observational results, explore the linkages between these O-3 variations and wind flows, and identify the dominant processes for the occurrence of high O-3 that varies with wind flows. The results from the observations over 2015-2021 suggest that, over coastal regions, surface O-3 concentrations show a strong dependence on wind flow changes. On average, during the daytime, when southeasterly winds prevail, the mean of O-3 concentrations reaches 83.5 mu g/m(3), which is 5.0 mu g/m(3) higher than its baseline values (the mean O-3 concentrations), while the northwesterly winds tend to reduce surface O-3 by 6.4 mu g/m(3). The positive O-3 anomalies with southeasterly wind are higher in the autumn and summer than in the spring and winter. During the nighttime, the onshore northeasterly winds are associated with enhanced O-3 levels, likely due to the airmass containing less NO2, alleviating the titration effects. Over inland regions, however, surface O-3 variations are less sensitive to wind flow changes. The GEOS-Chem simulations show that the prevailing southeasterly and southwesterly winds lead to the positive anomaly of chemical reactions of O-3 over coastal regions, suggesting enhanced photochemical production rates. Furthermore, southeasterly winds also aid in transporting more O-3 from the outer regions into the coastal regions of Fujian, which jointly results in elevated surface O-3 when southeasterly winds dominates. When affected by wind flows in different directions, the chemical reaction and transport in the inland regions do not exhibit significant differences regarding their impact on O-3. This could be one of the reasons for the difference in O-3 distribution between coastal and inland regions. This study could help to deepen our understanding of O-3 pollution and aid in providing an effective warning of high-O-3 episodes.
英文关键词	O-3 concentration; southeast China; wind flow
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:001192028500001
来源期刊	ATMOSPHERE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/306050
作者单位	Fujian Normal University; University of Toronto
推荐引用方式 GB/T 7714	Shen, Yukun,Liu, Jane,Chen, Zhixiong,et al. Influence of Wind Flows on Surface O3 Variation over a Coastal Province in Southeast China[J],2024,15(3).
APA	Shen, Yukun.,Liu, Jane.,Chen, Zhixiong.,Yang, Mengmiao.,Shu, Lei.,...&Jiang, Yongcheng.(2024).Influence of Wind Flows on Surface O3 Variation over a Coastal Province in Southeast China.ATMOSPHERE,15(3).
MLA	Shen, Yukun,et al."Influence of Wind Flows on Surface O3 Variation over a Coastal Province in Southeast China".ATMOSPHERE 15.3(2024).