Contemporary and pre-industrial global reactive nitrogen budgets

  title={Contemporary and pre-industrial global reactive nitrogen budgets},
  author={Elisabeth Holland and Frank Dentener and Bobby H. Braswell and James M. Sulzman},
Increases and expansion of anthropogenic emissions of both oxidized nitrogen compounds, NOx, and a reduced nitrogen compound, NH3, have driven an increase in nitrogen deposition. We estimate global NOx and NH3 emissions and use a model of the global troposphere, MOGUNTIA, to examine the pre-industrial and contemporary quantities and spatial patterns of wet and dry NOy and NHx deposition. Pre-industrial wet plus dry NOx and NHx deposition was greatest for tropical ecosystems, related to soil… Expand
Physical and biogeochemical controls over terrestrial ecosystem responses to nitrogen deposition
Anthropogenic perturbations to the global nitrogen (N) cycle nowexceed those to any other major biogeochemical cycle on Earth, yet ourability to predict how ecosystems will respond to the rapidlyExpand
Atmospheric N Deposition Increases Organic N Loss from Temperate Forests
Atmospheric deposition of nitrogen (N) resulting from fossil fuel combustion has increased N inputs to temperate forests worldwide with large consequences for forest productivity and water quality.Expand
Spatial and temporal patterns of nitrogen deposition in China: Synthesis of observational data
[1] Anthropogenic nitrous pollutant emissions in China significantly increased during the last decades, which contributed to the accelerated nitrogen ( N) deposition. In order to characterize spatialExpand
Nitrogen loss from unpolluted South American forests mainly via dissolved organic compounds
Stream chemistry data from 100 unpolluted primary forests in temperate South America is reported, and it is suggested that organic nitrogen losses should be considered in models of forest nutrient cycling, which could help to explain observations of nutrient limitation in temperates forest ecosystems. Expand
Atmospheric deposition of nitrogen: Implications for nutrient over-enrichment of coastal waters
Atmospheric deposition of nitrogen (AD-N) is a significant source of nitrogen enrichment to nitrogen (N)-limited estuarine and coastal waters downwind of anthropogenic emissions. Along the easternExpand
Anthropogenic nitrogen sources and relationships to riverine nitrogen export in the northeastern U.S.A.
The understanding of the sources of N in landscapes is provided, and how human activities impact N cycling in the northeast region is highlighted, which makes agriculture the largest overall source of N. Expand
Nitrogen deposition sources and patterns in the Greater Yellowstone Ecosystem determined from ion exchange resin collectors, lichens, and isotopes.
This study measured Ndep amounts and δ15N in montane conifer forests of the Greater Yellowstone Ecosystem using canopy throughfall and bulk monitors and lichens and examined patterns of C:N ratios in lichens as a possible indicator of lichen physiological condition. Expand
Lichen-based critical loads for atmospheric nitrogen deposition in Western Oregon and Washington Forests, USA.
Tight linear correlation between lichen and IMPROVE data suggests a simple screening tool for CL exceedance in US Class I areas, and the total N model replicated several US and European lichen CLs and may therefore be helpful in estimating other temperate-forest lichenCLs. Expand
Evaluating the effects of nitrogen and sulfur deposition and ozone on tree growth and mortality in California using a spatially comprehensive forest inventory
Abstract Although nitrogen deposition and tropospheric ozone have impacted California forests for decades, broad scale studies of these impacts on forest growth and mortality are lacking. Because ofExpand
Molecular nitrogen is a highly abundant element in the atmosphere; it is stable and not very reactive. Anthropogenic activities have caused greater concentrations of nitrogencontaining compounds thatExpand