气候变化领域集成服务门户(CCPortal): Sources of ammonium in seasonal wet deposition at a coastal New England city

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DOI	10.1016/j.atmosenv.2021.118557
	Sources of ammonium in seasonal wet deposition at a coastal New England city
	Le Roy E.; Walters W.W.; Joyce E.E.; Hastings M.G.
发表日期	2021
ISSN	1352-2310
卷号	260
英文摘要	National monitoring networks have reported an increase in ammonium (NH4+) deposition, such that NH4+ now dominates inorganic nitrogen deposition across most of the United States. Atmospheric deposition of fixed nitrogen has significant environmental consequences, including acidification and eutrophication. Thus, understanding source contributions is critical for formulating policies to mitigate the effects of excess nitrogen in sensitive ecosystems. Here, we investigated sources of wet-deposited NH4+ (w-NH4+) in Providence, RI, U.S.A., a mid-sized coastal city at the head of Narragansett Bay. We utilized concentration measurements, nitrogen stable isotopes (δ15N), and air mass back trajectory analysis for precipitation events and intra-event samples collected between January–November 2018. There was a general lack of seasonality in δ15N(w-NH4+). Air mass origin had a strong influence on [w-NH4+], but [w-NH4+] was not related to δ15N(w-NH4+), suggesting the potential dominance of a single NH3 emission source type. An average δ15N(w-NH4+) of −3.7 ± 3.5‰ (n = 42) was measured for daily-based precipitation. This value is consistent with previous measurements in the U.S. over the past 40 years, indicating a similar source of NH3 across the U.S. likely derived from agricultural activities. Intra-event analysis from precipitation events collected throughout the year found frequent mid- and end-event [w-NH4+] peaks that were suggested to be related to in-cloud [w-NH4+] changes rather than changes in below-cloud scavenging due to a consistent corresponding shift in precipitation intensity. Large intra-event δ15N(w-NH4+) variations as high as 15.9‰ were also observed. However, the cumulative mass-weighted δ15N(w-NH4+) of the intra-event series tended to converge to a similar value (−4.8 ± 1.3‰; n = 6). Overall, our results indicate that long-range transport via in-cloud scavenging tended to play a stronger role in shaping w-NH4+ patterns compared to local emissions at our study site. © 2021 Elsevier Ltd
关键词	Ammonium Deposition Long-range transport Precipitation Stable isotope Wet scavenging
语种	英语
scopus关键词	Ammonia; Deposition; Eutrophication; Isotopes; Meteorological problems; Nitrogen; $+15$/N; Ammonium; Long range transport; Monitoring network; New England; NH$-3$; Precipitation events; Stable isotopes; Wet deposition; Wet scavenging; Precipitation (chemical); ammonia; nitrogen; stable isotope; ammonium; coastal zone; environmental impact; environmental impact assessment; environmental monitoring; inorganic nitrogen; seasonality; wet deposition; agriculture; air; Article; bay; city; cloud; controlled study; environmental policy; exhaust gas; mass; nitrogen deposition; precipitation; seashore; seasonal variation; United States; urban area; wet deposition; New England; United States
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248345
作者单位	Department of Earth, Environmental, and Planetary Sciences, And Institute at Brown for Environment and Society, Brown University, Providence, RI 02912, United States
推荐引用方式 GB/T 7714	Le Roy E.,Walters W.W.,Joyce E.E.,et al. Sources of ammonium in seasonal wet deposition at a coastal New England city[J],2021,260.
APA	Le Roy E.,Walters W.W.,Joyce E.E.,&Hastings M.G..(2021).Sources of ammonium in seasonal wet deposition at a coastal New England city.ATMOSPHERIC ENVIRONMENT,260.
MLA	Le Roy E.,et al."Sources of ammonium in seasonal wet deposition at a coastal New England city".ATMOSPHERIC ENVIRONMENT 260(2021).