DOI: 10.1016/j.atmosenv.2016.11.039
Scopus记录号: 2-s2.0-85005976227
论文题名: Spatial and temporal patterns of nitrogen isotopic composition of ammonia at U.S. ammonia monitoring network sites
作者: Felix J ; D ; , Elliott E ; M ; , Gay D ; A
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 150 起始页码: 434
结束页码: 442
语种: 英语
英文关键词: Air monitoring
; Air quality
; Ammonia
; Ammonium
; Emissions
; Isotope
; Nitrogen
; Reactive nitrogen
Scopus关键词: Agriculture
; Air quality
; Coal
; Fossil fuel power plants
; Isotopes
; Nitrogen
; Particulate emissions
; Agricultural activities
; Air monitoring
; Ammonium
; Coal-fired power plant
; Fertilizer applications
; Reactive nitrogen
; Spatial and temporal patterns
; Spatial and temporal trends
; Ammonia
; ammonia
; nitrogen
; air quality
; ammonia
; ammonium
; concentration (composition)
; emission control
; emission inventory
; European Union
; isotopic composition
; nitrogen
; particle size
; particulate matter
; pollutant source
; pollution monitoring
; spatiotemporal analysis
; air quality
; Article
; chemical composition
; coal power
; fertilizer application
; fractionation
; particulate matter
; priority journal
; seasonal variation
; volatilization
; Midwest
; United States
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Ammonia (NH3) emissions and ammonium (NH4 +) deposition can have harmful effects on the environment and human health but remain generally unregulated in the U.S. PM2.5 regulations require that an area not exceed an annual average PM2.5 value of 12 μg/m3 (averaged over three years), and since NH3 is a significant precursor to PM2.5 formation these are the closest indirect regulations of NH3 emissions in the U.S. If the U.S. elects to adopt NH3 emission regulations similar to those applied by the European Union, it will be imperative to first adequately quantify NH3 emission sources and transport, and also understand the factors causing varying emissions from each source. To further investigate NH3 emission sources and transport at a regional scale, NH3 was sampled monthly at a subset of nine Ammonia Monitoring Network (AMoN) sites and analyzed for nitrogen isotopic composition of NH3 (δ15N-NH3). The observed δ15N-NH3 values ranged from −42.4 to +7.1‰ with an average of −15.1 ± 9.7. The observed δ15N-NH3 values reported here provide insight into the spatial and temporal trends of the NH3 sources that contribute to ambient [NH3] in the U.S. In regions where agriculture is prevalent (i.e., U.S. Midwest), low and seasonally variable δ15N-NH3 values are observed and are associated with varying agricultural sources. In comparison, rural nonagricultural areas have higher and more seasonally consistent δ15N-NH3 values associated with a constant “natural” (e.g. soil, vegetation, bi-directional flux, ocean) NH3 source. With regards to temporal variation, the peak in U.S. spring agricultural activity (e.g. fertilizer application, livestock waste volatilization) is accompanied by a decrease in δ15N-NH3 values at a majority of the sites, whereas higher δ15N-NH3 values in other seasons could be due to shifting sources (e.g. coal-fired power plants) and/or fractionation scenarios. Fractionation processes that may mask NH3 source signatures are discussed and require further investigation to optimize the utility of the nitrogen isotopic composition to determine NH3 sources and dynamics. © 2016 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82260
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Physical and Environmental Science, Texas A & M University – Corpus Christi, 6300 Ocean Drive, Corpus Christi, TX, United States; Department of Geology & Environmental Science, University of Pittsburgh, 4107 O'Hara Street, Pittsburgh, PA, United States; National Atmospheric Deposition Program, University of Illinois-Urbana Champaign, 2204 Griffith Drive, Champaign, IL, United States
Recommended Citation:
Felix J,D,, Elliott E,et al. Spatial and temporal patterns of nitrogen isotopic composition of ammonia at U.S. ammonia monitoring network sites[J]. Atmospheric Environment,2017-01-01,150