کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8864123 | 1620298 | 2018 | 39 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Spatial and temporal variation in sources of atmospheric nitrogen deposition in the Rocky Mountains using nitrogen isotopes
ترجمه فارسی عنوان
تنوع فضایی و زمانی در منابع رسوب نیتروژن جو در کوه های راکی با استفاده از ایزوتوپ های نیتروژن
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کلمات کلیدی
رسوبات جوی، ایزوتوپ نیتروژن، آمونیوم، نیترات، کوه های راکی، کیفیت هوا،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علم هواشناسی
چکیده انگلیسی
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. δ15NâNO3â at 50 U.S. Geological Survey Rocky Mountain Snowpack (Snowpack) sites ranged from â3.3â° to +6.5â°, with a mean value of +1.4â°. At 15 National Atmospheric Deposition Program (NADP)/National Trends Network wet deposition (NADP Wetfall) sites, summer δ15NâNO3â is significantly lower ranging from â7.6â° to â1.3â° while winter δ15NâNO3â ranges from â2.6â° to +5.5â°, with a mean value of +0.7â° during the cool season. The strong seasonal difference in NADP Wetfall δ15NâNO3â 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 NO3â and δ15NâNO3â 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 NO3â concentrations and δ15NâNO3â in the Southern Rocky Mountains located near larger anthropogenic N emission sources compared to the Northern Rocky Mountains. NADP Wetfall δ15NâNH4+ ranged from â10â° to 0â°, with no observed spatial pattern. However, the lowest δ15NâNH4+(â9â°), and the highest NH4+ concentration (35 μeq/L) were observed at a Utah site dominated by local agricultural activities, whereas the higher δ15NâNH4+ 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Atmospheric Environment - Volume 176, March 2018, Pages 110-119
Journal: Atmospheric Environment - Volume 176, March 2018, Pages 110-119
نویسندگان
Leora Nanus, Donald H. Campbell, Christopher M.B. Lehmann, M. Alisa Mast,