Change search
ReferencesLink to record
Permanent link

Direct link
Future Riverine Nitrogen Export to Coastal Regions in the United States: Prospects for Improving Water Quality
National Research Council, National Academies of Science, USA; Washington State University, USA.ORCID iD: 0000-0002-8570-2831
Washington State University, USA.
Western Ecology Division, USEPA, USA.
2015 (English)In: Journal of Environmental Quality, ISSN 0047-2425, E-ISSN 1537-2537, Vol. 44, no 2, 345-355 p.Article in journal (Refereed) Published
Abstract [en]

Nitrogen (N) fluxes generated by an increasing human population have the potential to increase coastal riverine N loading, with implications for areas already degraded by elevated nutrient loads. Here we examine contemporary (year 2005) and future (year 2030) loading of total dissolved N (TDN) in the continental United States using the Nutrient Export from WaterSheds model (NEWS2US–TDN). Model-derived TDN estimates compared well with measured export of 29 catchments that represent 65% of land surface area for the continental United States (Nash–Sutcliffe efficiency = 0.83). Future output is based on scenarios that reflect future population growth and “business as usual” (BAU) and “ambitious” (AMB) approaches to nutrient management. Model-derived TDN export was 2.1 Tg N yr−1 in 2005 and 2.2 and 1.6 Tg N yr−1 in 2030 for the BAU and AMB scenarios, respectively. Depending on year and scenario, agriculture supplies 44 to 48% of coastal TDN, atmospheric N deposition supplies 14 to 17%, human sewage supplies 13 to 18%, and background sources supply 21 to 29%. The AMB scenario suggests that reducing nutrient loads to coastal areas will require aggressive actions, including a 25% improvement in agricultural nutrient use efficiency, a 20% reduction in N runoff from croplands, a 30% reduction in ammonia emissions from agriculture, and a 40% reduction in nitrogen oxide emissions from vehicles. Together, these aggressive actions could reduce year 2030 TDN export by 24% from 2005 levels, even with a 20% larger population.

Place, publisher, year, edition, pages
2015. Vol. 44, no 2, 345-355 p.
National Category
Environmental Sciences
URN: urn:nbn:se:su:diva-122377DOI: 10.2134/jeq2014.02.0081OAI: diva2:865919
Available from: 2015-10-29 Created: 2015-10-29 Last updated: 2015-11-13Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
McCrackin, Michelle L.
In the same journal
Journal of Environmental Quality
Environmental Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 13 hits
ReferencesLink to record
Permanent link

Direct link