气候变化领域集成服务门户(CCPortal): Impacts of synoptic circulations on summertime ozone pollution in Guanzhong Basin, northwestern China

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DOI	10.1016/j.atmosenv.2021.118660
	Impacts of synoptic circulations on summertime ozone pollution in Guanzhong Basin, northwestern China
	Yan Y.; Wang X.; Qu K.; Li X.; Shi W.; Peng Z.; Zhang Y.
发表日期	2021
ISSN	1352-2310
卷号	262
英文摘要	The Guanzhong Basin (GZB) has long been considered the most polluted city cluster in northwestern China with exposure to unhealthy levels of ozone (O3) in summer, which is strongly associated with adverse meteorological conditions and massive percussor emissions. In this study, four typical synoptic circulation types (CTs) were identified in the summers of 2014–2019 via the T-mode PCA classification method, including two polluted (southeast high and northeast ridge), one lightly polluted (east high), and one clean (northwest high) type. The impact of CTs on the atmospheric transport and diffusion conditions gradually weakened with decreasing altitude, while local circulation played a critical role near the ground, resulting in dominant northeast and southwest surface winds, high proportions of stagnation conditions (>50%). In particular, the meteorological conditions under the southeast high-type were marked by increasing influences of southerly airflow, high temperatures, low humidities, and the worst diffusion conditions, all of which were favorable for the local production of O3. While, the northeast ridge-type was characterized by easterly airflows in the upper air, which transported O3 and its precursors from upwind polluted areas. The regional transport model CAMx was applied to quantify the O3 sources over the GZB. The heaviest O3 pollution occurred under the southeast high-type, associated with the fast chemical formation rates and significant contributions from local emissions. The enhanced atmospheric oxidative capacity under the southeast high-type was suggested by elevated O3 and Ox (O3 + NO2) concentrations in the atmospheric boundary layer. Although the northeast ridge- and east high-type circulations led to similar chemical productions of O3, the cross-regional transport of O3 was increased under the northeast ridge-type and resulted in severe O3 pollution. This would serve to maximize regional O3 reduction under varying synoptic circulation conditions. © 2021 Elsevier Ltd
关键词	Guanzhong Basin Meteorological condition Ozone pollution Source apportionment Synoptic circulation
语种	英语
scopus关键词	Air pollution; Atmospheric boundary layer; Atmospheric chemistry; Atmospheric movements; Atmospheric transport; Classification methods; Condition; Guanzhong basin; Meteorological condition; Northwestern China; Ozone pollution; Source apportionment; Summertime ozone; Synoptic circulations; Ozone; atmospheric transport; climate classification; climate conditions; hydrometeorology; light pollution; meteorology; ozone; spatiotemporal analysis; summer; Guanzhong Plain
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248267
作者单位	State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China; International Joint Laboratory for Regional Pollution Control, Ministry of Education, Beijing, 100816, China; Beijing Innovation Center for Engineering Science and Advanced Technology, Peking University, Beijing, 100871, China; CAS Center for Excellence in Regional Atmospheric Environment, Chinese Academy of Sciences, Xiamen, 361021, China
推荐引用方式 GB/T 7714	Yan Y.,Wang X.,Qu K.,et al. Impacts of synoptic circulations on summertime ozone pollution in Guanzhong Basin, northwestern China[J],2021,262.
APA	Yan Y..,Wang X..,Qu K..,Li X..,Shi W..,...&Zhang Y..(2021).Impacts of synoptic circulations on summertime ozone pollution in Guanzhong Basin, northwestern China.ATMOSPHERIC ENVIRONMENT,262.
MLA	Yan Y.,et al."Impacts of synoptic circulations on summertime ozone pollution in Guanzhong Basin, northwestern China".ATMOSPHERIC ENVIRONMENT 262(2021).