气候变化领域集成服务门户(CCPortal): Seasonal modeling analysis of nitrate formation pathways in Yangtze River Delta region, China

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DOI	10.5194/acp-22-12629-2022
	Seasonal modeling analysis of nitrate formation pathways in Yangtze River Delta region, China
	Sun, Jinjin; Qin, Momei; Xie, Xiaodong; Fu, Wenxing; Qin, Yang; Sheng, Li; Li, Lin; Li, Jingyi; Sulaymon, Ishaq Dimeji; Jiang, Lei; Huang, Lin; Yu, Xingna; Hu, Jianlin
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	12629
结束页码	12646
卷号	22 期号:18 页码:18
英文摘要	Nitrate (NO3-) has been the dominant and the least reduced chemical component of fine particulate matter (PM2.5) since the stringent emission controls implemented in China in 2013. The formation pathways of NO3- vary seasonally and differ substantially in daytime vs. nighttime. They are affected by precursor emissions, atmospheric oxidation capacity, and meteorological conditions. Understanding NO3 - formation pathways provides insights for the design of effective emission control strategies to mitigate NO3 - pollution. In this study, the Community Multiscale Air Quality (CMAQ) model was applied to investigate the impact of regional transport, predominant physical processes, and different formation pathways to NO3- and total nitrate (TNO3, i.e., HNO3+ NO3-) production in the Yangtze River Delta (YRD) region during the four seasons of 2017. NO3-/PM2.5 and NO3-/TNO3 are the highest in the winter, reaching 21 % and 94 %, respectively. The adjusted gas ratio (adjGR = ([NH3]+ [NO3-])/([HNO3]+ [NO3-])) in the YRD is generally greater than 2 in the four seasons across most areas in the YRD, indicating that YRD is mostly in the NH3 -rich regime and that NO3- is limited by HNO3 formation. Local emissions and regional transportation contribute to NO3- concentrations throughout the YRD region by 50 %-62 % and 38 %-50 %, respectively. The majority of the regional transport of NO3- concentrations is contributed by indirect transport (i.e., NO3- formed by transported precursors reacting with local precursors). Aerosol (AERO, including condensation, coagulation, new particle formation, and aerosol growth) processes are the dominant source of NO3- formation. In summer, NO3- formation is dominated by AERO and total transport (TRAN, sum of horizontal and vertical transport) processes. The OH + NO2 pathway contributes to 60 %-83 % of the TNO3 production, and the N2O5 heterogeneous (HET N2O5) pathway contributes to 10 %-36 % in the YRD region. HET N205 contribution becomes more important in cold seasons than warm seasons. Within the planetary boundary layer in Shanghai, the TNO3 production is dominated by the OH + NO2 pathway during the day (98 %) in the summer and spring and by the HET N2O5 pathway during the night (61 %) in the winter. Local contributions dominate the OH + NO2 pathway for TNO3 production during the day, while indirect transport dominates the HET N2O5 pathway at night.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000860759200001
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/273546
作者单位	Nanjing University of Information Science & Technology; Nanjing University of Information Science & Technology
推荐引用方式 GB/T 7714	Sun, Jinjin,Qin, Momei,Xie, Xiaodong,et al. Seasonal modeling analysis of nitrate formation pathways in Yangtze River Delta region, China[J],2022,22(18):18.
APA	Sun, Jinjin.,Qin, Momei.,Xie, Xiaodong.,Fu, Wenxing.,Qin, Yang.,...&Hu, Jianlin.(2022).Seasonal modeling analysis of nitrate formation pathways in Yangtze River Delta region, China.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(18),18.
MLA	Sun, Jinjin,et al."Seasonal modeling analysis of nitrate formation pathways in Yangtze River Delta region, China".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.18(2022):18.