四川盆地大气氨与氮氧化物排放对细颗粒物污染的影响及减排潜力

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Abstract In this study, satellite data derived from IASI, OMI and TROPOMI were adopted to infer the trend of ammonia and NO_x emissions over 2008~2019 and the weather research forecast model (WRF) and the Community Multiscale Air Quality (CMAQ) were used to assess the environmental consequence of ammonia emissions over the Sichuan Basin in the winter of 2019. Furthermore, sensitivity experiments were performed to evaluate impacts of ammonia or NO_x emission reduction and ammonia and nitrogen oxides coordinated emission reduction scenarios on fine particles. The results show that nitrogen oxides emissions increased interannually from 2008 to 2012 and then decreased rapidly from 2013 to 2019, while ammonia columns were relatively stable over 2008~2013 and increased significantly from 2014 onwards. The hotspots of ammonia emissions in the Sichuan Basin were mainly concentrated in southern Sichuan city cluster and Chengdu and surrounding areas where anthropogenic activities were intense. The elevated ammonia emissions were also observed in the northwestern Sichuan city cluster dominated by agricultural sources. Ammonia ions accounted for a relatively high fraction of PM_2.5 in southern Sichuan city cluster, up to 11.4%, while its contribution to PM_2.5 in the cities of western Sichuan were relatively low. Sensitivity experiments indicate that the coordinated emission regulation in simultaneously reducing 50% NO_x and ammonia could effectively diminish the concentrations of ammonium nitrate and ammonium sulfate in PM_2.5, therefore reduce fine particulate pollution and improve the regional ambient air quality across the Sichuan Basin.

Key words： ammonia fine particle matter(PM_2.5) Sichuan Basin WRF-CMAQ

Received: 24 January 2022

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X513

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	Articles by authors
	YANG Xian-yu
	LYU Ya-qiong
	SHAO Ping
	PAN Yue-peng
	FAN Jin
	WANG Shi-gong
	ZHANG Xiao-ling
	YI Jia-jun
	QIAO Yu-hong
	WU Kai

Cite this article:

YANG Xian-yu,LYU Ya-qiong,SHAO Ping等. Impacts of ammonia and nitrogen oxides emissions on fine particle matter pollution and mitigation potential over the Sichuan Basin[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(8): 3502-3511.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I8/3502

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