Attributes for MRB_E2RF1 Catchments by Major River Basins in the Conterminous United States: Average Atmospheric (Wet) Deposition of Inorganic Nitrogen, 2002

Data Series ◽  
2010 ◽  
Author(s):  
Michael Wieczorek ◽  
Andrew E. LaMotte
Keyword(s):  
United States ◽  
Wet Deposition ◽  
Inorganic Nitrogen ◽  
River Basins ◽  
Major River

scholarly journals Streamflow contributions from tribal lands to major river basins of the United States

PLoS ONE ◽  
2018 ◽  
Vol 13 (9) ◽  
pp. e0203872
Author(s):  
Kyle Blasch ◽  
Stephen Hundt ◽  
Patrick Wurster ◽  
Roy Sando ◽  
Antony Berthelote
Keyword(s):  
United States ◽  
River Basins ◽  
The United States ◽  
Major River ◽  
Tribal Lands

scholarly journals Increasing importance of deposition of reduced nitrogen in the United States

2016 ◽  
Vol 113 (21) ◽  
pp. 5874-5879 ◽  
Author(s):  
Yi Li ◽  
Bret A. Schichtel ◽  
John T. Walker ◽  
Donna B. Schwede ◽  
Xi Chen ◽  
...  
Keyword(s):  
United States ◽  
Nitrogen Deposition ◽  
Wet Deposition ◽  
Inorganic Nitrogen ◽  
Rapid Development ◽  
The United States ◽  
Natural Ecosystems ◽  
Nitrogen Emissions ◽  
Reduced Nitrogen ◽  
Reactive Nitrogen Emissions

Rapid development of agriculture and fossil fuel combustion greatly increased US reactive nitrogen emissions to the atmosphere in the second half of the 20th century, resulting in excess nitrogen deposition to natural ecosystems. Recent efforts to lower nitrogen oxides emissions have substantially decreased nitrate wet deposition. Levels of wet ammonium deposition, by contrast, have increased in many regions. Together these changes have altered the balance between oxidized and reduced nitrogen deposition. Across most of the United States, wet deposition has transitioned from being nitrate-dominated in the 1980s to ammonium-dominated in recent years. Ammonia has historically not been routinely measured because there are no specific regulatory requirements for its measurement. Recent expansion in ammonia observations, however, along with ongoing measurements of nitric acid and fine particle ammonium and nitrate, permit new insight into the balance of oxidized and reduced nitrogen in the total (wet + dry) US nitrogen deposition budget. Observations from 37 sites reveal that reduced nitrogen contributes, on average, ∼65% of the total inorganic nitrogen deposition budget. Dry deposition of ammonia plays an especially key role in nitrogen deposition, contributing from 19% to 65% in different regions. Future progress toward reducing US nitrogen deposition will be increasingly difficult without a reduction in ammonia emissions.

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