气候变化领域集成服务门户(CCPortal): Impact of control measures and typhoon weather on characteristics and formation of PM2.5 during the 2016 G20 summit in China

CCPortal

DOI	10.1016/j.atmosenv.2020.117312
	Impact of control measures and typhoon weather on characteristics and formation of PM2.5 during the 2016 G20 summit in China
	Zhang Y.; Hong Z.; Chen J.; Xu L.; Hong Y.; Li M.; Hao H.; Chen Y.; Qiu Y.; Wu X.; Li J.-R.; Tong L.; Xiao H.
发表日期	2020
ISSN	1352-2310
卷号	224
英文摘要	The implementation of strict emission control during the G20 summit in China and the occurrence of Typhoon Malarkas in September 2016 provided a valuable opportunity to examine the role of control measures and special weather condition in the formation of PM2.5. Water-soluble inorganic ions (WSII) were measured hourly in addition to PM2.5 mass concentration and black carbon (BC) and gaseous pollutants in Ningbo located in the Yangtze River Delta (YRD) region of China. Three distinct cases, i.e., a control case, a normal case, and a typhoon case, were investigated during the study period. PM2.5 was higher in the control case (37.5 μg m−3) than in the normal case (29.8 μg m−3), whereas the lowest PM2.5 (14.2 μg m−3) was observed in the typhoon case. The analyses of meteorology and backward trajectory suggested that stable weather and regional transport from inland regions accounted for the high PM2.5 under strict control. Only the concentrations of Ca2+ and NO3− decreased in the control case, while those of all water-soluble inorganic components (except Na+ and Mg2+) decreased substantially in the typhoon case. SO42− dominated the WSII, with the highest contribution, 62%, in the control case. This result was attributed to a stagnant atmosphere with a high relative humidity (RH), which was beneficial for the transformation of SO2 to SO42−. The control and typhoon cases both resulted in extremely low NO2, but the contribution of NO3− to PM2.5 was reduced in the control case and increased in the typhoon case. The close correlation of the NOR (nitrate oxidation ratio) with Na+ and Mg2+ in the typhoon case was indicative of sea salt associated with the typhoon which provided a surface for the heterogeneous formation of NO3−. The presented results facilitate a better understanding of the characteristics and formation of PM2.5 under the influence of artificial control and natural intervention. © 2020 Elsevier Ltd
关键词	Control measures Formation mechanism G20 Regional transport Secondary inorganic aerosol Typhoon
语种	英语
scopus关键词	Atmospheric movements; Emission control; Fog; River pollution; Storms; Control measures; Formation mechanism; Heterogeneous formation; High relative humidities; Inorganic components; Regional transport; Secondary inorganic aerosol; Water soluble inorganic ions; Hurricanes; black carbon; calcium; ion; magnesium; nitrate; sodium; aerosol; black carbon; emission control; oxidation; particulate matter; relative humidity; sea salt; transformation; typhoon; air pollution control; Article; atmosphere; China; concentration (parameter); control strategy; controlled study; humidity; hurricane; meteorology; oxidation; particulate matter; priority journal; China; Ningbo; Yangtze River; Zhejiang
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/249310
作者单位	Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; University of Chinese Academy of Sciences, Beijing, 100086, China; LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China
推荐引用方式 GB/T 7714	Zhang Y.,Hong Z.,Chen J.,et al. Impact of control measures and typhoon weather on characteristics and formation of PM2.5 during the 2016 G20 summit in China[J],2020,224.
APA	Zhang Y..,Hong Z..,Chen J..,Xu L..,Hong Y..,...&Xiao H..(2020).Impact of control measures and typhoon weather on characteristics and formation of PM2.5 during the 2016 G20 summit in China.ATMOSPHERIC ENVIRONMENT,224.
MLA	Zhang Y.,et al."Impact of control measures and typhoon weather on characteristics and formation of PM2.5 during the 2016 G20 summit in China".ATMOSPHERIC ENVIRONMENT 224(2020).