DOI: 10.1016/j.atmosenv.2017.12.023
Scopus记录号: 2-s2.0-85039437537
论文题名: Spatial and temporal variation in sources of atmospheric nitrogen deposition in the Rocky Mountains using nitrogen isotopes
作者: Nanus L ; , Campbell D ; H ; , Lehmann C ; M ; B ; , Mast M ; A
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 176 起始页码: 110
结束页码: 119
语种: 英语
英文关键词: Air quality
; Ammonium
; Atmospheric deposition
; Nitrate
; Nitrogen isotope
; Rocky Mountains
Scopus关键词: Agriculture
; Air quality
; Atmospheric chemistry
; Ecology
; Ecosystems
; Environmental protection
; Fossil fuels
; Fuels
; Isotopes
; Meteorological problems
; Nitrates
; Nitrogen
; Ammonium
; Atmospheric depositions
; Atmospheric nitrogen deposition
; National atmospheric deposition programs
; Nitrogen isotopes
; Rocky Mountains
; Southern rocky mountains
; Spatial and temporal variation
; Landforms
; fossil fuel
; nitrogen
; air quality
; ammonium
; atmospheric deposition
; atmospheric gas
; atmospheric pollution
; data set
; environmental policy
; fossil fuel
; human activity
; nitrate
; nitrogen isotope
; pollutant source
; seasonal variation
; snowpack
; spatiotemporal analysis
; temporal variation
; wet deposition
; Article
; atmospheric deposition
; Colorado
; combustion
; cycling
; ecosystem
; environmental policy
; nitrogen deposition
; priority journal
; seasonal variation
; summer
; wet deposition
; winter
; Wyoming
; Colorado
; Rocky Mountains
; United States
; Utah
; Wyoming
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: Variation in source areas and source types of atmospheric nitrogen (N) deposition to high-elevation ecosystems in the Rocky Mountains were evaluated using spatially and temporally distributed N isotope data from atmospheric deposition networks for 1995-2016. This unique dataset links N in wet deposition and snowpack to mobile and stationary emissions sources, and enhances understanding of the impacts of anthropogenic activities and environmental policies that mitigate effects of accelerated N cycling across the Rocky Mountain region. δ15N−NO3 − at 50 U.S. Geological Survey Rocky Mountain Snowpack (Snowpack) sites ranged from −3.3‰ to +6.5‰ with a mean value of +1.4‰. At 15 National Atmospheric Deposition Program (NADP)/National Trends Network wet deposition (NADP Wetfall) sites, summer δ15N−NO3 − is significantly lower ranging from −7.6‰ to −1.3‰ while winter δ15N−NO3 − ranges from −2.6‰ to +5.5‰ with a mean value of +0.7‰ during the cool season. The strong seasonal difference in NADP Wetfall δ15N−NO3 − is due in part to variation in the proportion of N originating from source regions at different times of the year due to seasonal changes in weather patterns. Snowpack NO3 − and δ15N−NO3 − are significantly related to NADP Wetfall (fall and winter) suggesting that bulk snowpack samples provide a reliable estimate at high elevations. Spatial trends show higher NO3 − concentrations and δ15N−NO3 − in the Southern Rocky Mountains located near larger anthropogenic N emission sources compared to the Northern Rocky Mountains. NADP Wetfall δ15N−NH4 + ranged from −10‰ to 0‰ with no observed spatial pattern. However, the lowest δ15N−NH4 +(−9‰), and the highest NH4 + concentration (35 μeq/L) were observed at a Utah site dominated by local agricultural activities, whereas the higher δ15N−NH4 + observed in Colorado and Wyoming are likely due to mixed sources, including fossil fuel combustion and agricultural sources. These findings show spatial and seasonal variation in N isotope data that reflect differences in sources of anthropogenic N deposition to high-elevation ecosystems and have important implications for environmental policy across the Rocky Mountain region. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83021
Appears in Collections: 气候变化事实与影响
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作者单位: San Francisco State University, San Francisco, CA, United States; U.S. Geological Survey, Denver Federal Center, Denver, CO, United States; National Atmospheric Deposition Program, Illinois State Water Survey, Champaign, IL, United States
Recommended Citation:
Nanus L,, Campbell D,H,et al. Spatial and temporal variation in sources of atmospheric nitrogen deposition in the Rocky Mountains using nitrogen isotopes[J]. Atmospheric Environment,2018-01-01,176