气候变化领域集成服务门户(CCPortal): Rising frequency of ozone-favorable synoptic weather patterns contributes to 2015-2022 ozone increase in Guangzhou

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DOI	10.1016/j.jes.2023.09.024
	Rising frequency of ozone-favorable synoptic weather patterns contributes to 2015-2022 ozone increase in Guangzhou
	Liu, Nanxi; He, Guowen; Wang, Haolin; He, Cheng; Wang, Haofan; Liu, Chenxi; Wang, Yiming; Wang, Haichao; Li, Lei; Lu, Xiao; Fan, Shaojia
发表日期	2025
ISSN	1001-0742
EISSN	1878-7320
起始页码	148
卷号	148
英文摘要	Objective weather classification methods have been extensively applied to identify dominant ozone -favorable synoptic weather patterns (SWPs), however, the consistency of different classification methods is rarely examined. In this study, we apply two widely -used objective methods, the self -organizing map (SOM) and K -means clustering analysis, to derive ozone -favorable SWPs at four Chinese megacities in 2015-2022. We find that the two algorithms are largely consistent in recognizing dominant ozone -favorable SWPs for four Chinese megacities. In the case of classifying six SWPs, the derived circulation fields are highly similar with a spatial correlation of 0.99 between the two methods, and the difference in the mean frequency of each SWP is less than 7%. The six dominant ozone -favorable SWPs in Guangzhou are all characterized by anomaly higher radiation and temperature, lower cloud cover, relative humidity, and wind speed, and stronger subsidence compared to climatology mean. We find that during 2015-2022, the occurrence of ozone -favorable SWPs days increases significantly at a rate of 3.2 day/year, faster than the increases in the ozone exceedance days (3.0 day/year). The interannual variability between the occurrence of ozone -favorable SWPs and ozone exceedance days are generally consistent with a temporal correlation coefficient of 0.6. In particular, the significant increase in ozone -favorable SWPs in 2022, especially the Subtropical High type which typically occurs in September, is consistent with a long-lasting ozone pollution episode in Guangzhou during September 2022. Our results thus reveal that enhanced frequency of ozone -favorable SWPs plays an important role in the observed 2015-2022 ozone increase in Guangzhou. (c) 2024 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
英文关键词	Ozone(O3 ); Objective weather classification; methods; Synoptic weather patterns; Trends; Guangzhou
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:001171426100001
来源期刊	JOURNAL OF ENVIRONMENTAL SCIENCES
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/303066
作者单位	Sun Yat Sen University; Southern Marine Science & Engineering Guangdong Laboratory; Southern Marine Science & Engineering Guangdong Laboratory (Zhuhai); Sun Yat Sen University
推荐引用方式 GB/T 7714	Liu, Nanxi,He, Guowen,Wang, Haolin,et al. Rising frequency of ozone-favorable synoptic weather patterns contributes to 2015-2022 ozone increase in Guangzhou[J],2025,148.
APA	Liu, Nanxi.,He, Guowen.,Wang, Haolin.,He, Cheng.,Wang, Haofan.,...&Fan, Shaojia.(2025).Rising frequency of ozone-favorable synoptic weather patterns contributes to 2015-2022 ozone increase in Guangzhou.JOURNAL OF ENVIRONMENTAL SCIENCES,148.
MLA	Liu, Nanxi,et al."Rising frequency of ozone-favorable synoptic weather patterns contributes to 2015-2022 ozone increase in Guangzhou".JOURNAL OF ENVIRONMENTAL SCIENCES 148(2025).