气候变化领域集成服务门户(CCPortal): Characterizing the spatiotemporal nitrogen stable isotopic composition of ammonia in vehicle plumes

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DOI	10.5194/acp-20-11551-2020
	Characterizing the spatiotemporal nitrogen stable isotopic composition of ammonia in vehicle plumes
	Walters W.W.; Song L.; Chai J.; Fang Y.; Colombi N.; Hastings M.G.
发表日期	2020
ISSN	1680-7316
起始页码	11551
结束页码	11567
卷号	20 期号:19
英文摘要	Vehicle emissions have been identified as an important urban source of ammonia (NH3). However, there are large uncertainties regarding the contribution of vehicle emissions to urban NH3 budgets, as well as the role of NH3 in spatiotemporal fine particulate matter (PM2.5) formation and nitrogen (N) deposition patterns. The N stable isotopic composition (δ15N) may be a useful observational constraint to track NH3 emission sources and chemical processing, but previously reported vehicle δ15N(NH3) emission signatures have reported a wide range of values, indicating the need for further refinement. Here we have characterized δ15N(NH3) spatiotemporal variabilities from vehicle plumes in stationary and on-road measurements in the USA and China using an active NH3 collection technique demonstrated to accurately characterize δ15N(NH3) on the order of hourly time resolution. Significant spatial and temporal δ15N(NH3) variabilities were observed and suggested to be driven by vehicle fleet composition and influences from NH3 dry deposition on tunnel surfaces. Overall, a consistent δ15N(NH3) signature of 6.6±2.1 ‰ (x±1σ; n = 80) was found in fresh vehicle plumes with fleet compositions typical of urban regions. Our recommended vehicle δ15N(NH3) signature is significantly different from previous reports. This difference is due to a large and consistent δ15N(NH3) bias of approximately −15.5 ‰ between commonly employed passive NH3 collection techniques and the laboratory-tested active NH3 collection technique. This work constrains the δ15N(NH3) urban traffic plume signature, which has important implications for tracking vehicle NH3 in urban-affected areas and highlights the importance of utilizing verified collection methods for accurately characterizing δ15N(NH3) values. © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
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/141078
作者单位	Department of Earth, Environmental, and Planetary Sciences, Brown University, Providence, RI 02912, United States; Institute at Brown for Environment and Society, Brown University, Providence, RI 02912, United States; CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, Liaoning, 110016, China; Key Laboratory of Stable Isotope Techniques and Applications, Shenyang, Liaoning, 110016, China; College of Sources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China; Department of Earth and Planetary Science, Harvard University, Cambridge, MA 02139, United States
推荐引用方式 GB/T 7714	Walters W.W.,Song L.,Chai J.,et al. Characterizing the spatiotemporal nitrogen stable isotopic composition of ammonia in vehicle plumes[J],2020,20(19).
APA	Walters W.W.,Song L.,Chai J.,Fang Y.,Colombi N.,&Hastings M.G..(2020).Characterizing the spatiotemporal nitrogen stable isotopic composition of ammonia in vehicle plumes.Atmospheric Chemistry and Physics,20(19).
MLA	Walters W.W.,et al."Characterizing the spatiotemporal nitrogen stable isotopic composition of ammonia in vehicle plumes".Atmospheric Chemistry and Physics 20.19(2020).