气候变化领域集成服务门户(CCPortal): Quantifying the importance of vehicle ammonia emissions in an urban area of northeastern USA utilizing nitrogen isotopes

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DOI	10.5194/acp-22-13431-2022
	Quantifying the importance of vehicle ammonia emissions in an urban area of northeastern USA utilizing nitrogen isotopes
	Walters, Wendell W.; Karod, Madeline; Willcocks, Emma; Baek, Bok H.; Blum, Danielle E.; Hastings, Meredith G.
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	13431
结束页码	13448
卷号	22 期号:20 页码:18
英文摘要	Atmospheric ammonia (NH3) is a critical component of our atmosphere that contributes to air quality degradation and reactive nitrogen deposition; however, our knowledge of NH3 in urban environments remains limited. Year-long ambient NH3 and related species were measured for concentrations and the nitrogen isotopic compositions (delta N-15) of NH3 and particulate ammonium (pNH(4)(+)) were measured to understand the temporal sources and chemistry of NH3 in a northeastern US urban environment. We found that urban NH3 and pNH(4)(+ )concentrations were elevated compared to regional rural background monitoring stations, with seasonally significant variations. Local and transported sources of NHx (NH(3)(+)pNH(4)(+)) were identified using polar bivariate and statistical back trajectory analysis, which suggested the importance of vehicles, volatilization, industry, and stationary fuel combustion emissions. Utilizing a uniquely positive delta N-15(NH3) emission source signature from vehicles, a Bayesian stable isotope mixing model (SIMMR) indicates that vehicles contribute 46.8 +/- 3.5% (mean +/- 1 sigma) to the annual background level of urban NHx , with a strong seasonal pattern with higher relative contribution during winter (56.4 +/- 7.6%) compared to summer (34.1 +/- 5.5%). The decrease in the relative importance of vehicle emissions during the summer was suggested to be driven by temperature-dependent NH3 emissions from volatilization sources, seasonal fuel-combustion emissions related to energy generation, and change in seasonal transport patterns based on wind direction, back trajectory, and NH3 emission inventory analysis. This work highlights that reducing vehicle NH3 emissions should be considered to improve wintertime air quality in this region.
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:000869126000001
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/273145
作者单位	Brown University; Brown University; Simmons University; Brown University; George Mason University; Brown University
推荐引用方式 GB/T 7714	Walters, Wendell W.,Karod, Madeline,Willcocks, Emma,et al. Quantifying the importance of vehicle ammonia emissions in an urban area of northeastern USA utilizing nitrogen isotopes[J],2022,22(20):18.
APA	Walters, Wendell W.,Karod, Madeline,Willcocks, Emma,Baek, Bok H.,Blum, Danielle E.,&Hastings, Meredith G..(2022).Quantifying the importance of vehicle ammonia emissions in an urban area of northeastern USA utilizing nitrogen isotopes.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(20),18.
MLA	Walters, Wendell W.,et al."Quantifying the importance of vehicle ammonia emissions in an urban area of northeastern USA utilizing nitrogen isotopes".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.20(2022):18.