气候变化领域集成服务门户(CCPortal): Nonlinear responses of particulate nitrate to NOx emission controls in the megalopolises of China

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DOI	10.5194/acp-21-15135-2021
	Nonlinear responses of particulate nitrate to NOx emission controls in the megalopolises of China
	Li M.; Zhang Z.; Yao Q.; Wang T.; Xie M.; Li S.; Zhuang B.; Han Y.
发表日期	2021
ISSN	1680-7316
起始页码	15135
结束页码	15152
卷号	21 期号:19
英文摘要	Nitrate is an increasingly important component of fine particulate matter (PM2.5) in Chinese cities. The production of nitrate is not only related to the abundance of its precursor, but it is also supported by the atmospheric photochemical oxidants, raising a new challenge for the current emission control actions in China. This paper uses comprehensive measurements and a regional meteorology-chemistry model with optimized mechanisms to establish the nonlinear responses between particulate nitrate and the emission controls of nitrogen oxides (NOx) in the megalopolises of China. Nitrate is an essential component of PM2.5 in eastern China, accounting for 9.4g %-15.5g % and 11.5g %-32.1g % of the PM2.5 mass for the warm and cold seasons. The hypothetical NOx emission reduction scenarios (-10g % to-80g %) during summer-Autumn result in almost linearly lower PM2.5 by-2.2g % in Beijing-Tianjin-Hebei (BTH) and-2.9g % in Yangtze River Delta (YRD) per 10g % reduction of NOx emissions, whereas they lead to a rather complicated response of PM components in winter. Wintertime nitrate is found to increase by +4.1g % in BTH and +5.1g % in YRD per 10g % reduction of NOx emissions, with nearly unchanged nitric acid (HNO3) and higher dinitrogen pentoxide (N2O5) intermediate products produced from the increased atmospheric oxidant levels. An inflexion point appears at 30g %-50g % NOx emission reduction, and a further reduction in NOx emissions is predicted to cause-10.5g % reduction of nitrate for BTH and-7.7g % for YRD per 10g % reduction of NOx emissions. In addition, the 2012-2016 NOx control strategy actually leads to no changes or even increases of nitrate in some areas (8.8g % in BTH and 14.4g % in YRD) during winter. Our results also emphasize that ammonia (NH3) and volatile organic compounds (VOCs) are effective in controlling nitrate pollution, whereas decreasing the sulfur dioxide (SO2) and NOx emissions may have counterintuitive effects on nitrate aerosols. This paper helps understand the nonlinear aerosol and photochemistry feedbacks and defines the effectiveness of proposed mitigations for the increasingly serious nitrate pollution in China. © Copyright:
语种	英语
scopus关键词	aerosol; ammonia; atmospheric pollution; emission; nitrate; nitrogen oxides; particulate matter; photochemistry; sulfur dioxide; Beijing [Beijing (ADS)]; Beijing [China]; China; Hebei; Tianjin; Yangtze Delta
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246515
作者单位	School of Atmospheric Sciences, Nanjing University, Nanjing, 210023, China; Statistical Bureau of Qingjiangpu District, Huaian, 223001, China; Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, School of Atmospheric Sciences, Sun Yat-Sen University, Guangzhou, 510000, China
推荐引用方式 GB/T 7714	Li M.,Zhang Z.,Yao Q.,et al. Nonlinear responses of particulate nitrate to NOx emission controls in the megalopolises of China[J],2021,21(19).
APA	Li M..,Zhang Z..,Yao Q..,Wang T..,Xie M..,...&Han Y..(2021).Nonlinear responses of particulate nitrate to NOx emission controls in the megalopolises of China.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(19).
MLA	Li M.,et al."Nonlinear responses of particulate nitrate to NOx emission controls in the megalopolises of China".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.19(2021).