FastFind »   Lastname: doi:10.1029/ Year: | Advanced Search  

AGU: Global Biogeochemical Cycles

 

Keywords

  • agricultural systems
  • anthropogenic effects
  • DIN
  • nitrogen cycling
  • river export
  • surface water quality

Index Terms

  • Biogeosciences: Nitrogen cycling
  • Hydrology: Surface water quality
  • Hydrology: Anthropogenic effects
  • Biogeosciences: Agricultural systems

Abstract

GLOBAL BIOGEOCHEMICAL CYCLES, VOL. 19, GB4S02, 13 PP., 2005
doi:10.1029/2005GB002488

Global distribution and sources of dissolved inorganic nitrogen export to the coastal zone: Results from a spatially explicit, global model

E. Dumont

Environmental Systems Analyses Group, Wageningen University, Wageningen, Netherlands

J. A. Harrison

Institute of Marine and Coastal Sciences, Rutgers/NOAA CMER Program, Rutgers University, New Brunswick, New Jersey, USA

C. Kroeze

Environmental Systems Analyses Group, Wageningen University, Wageningen, Netherlands

E. J. Bakker

Mathematical and Statistical Methods Group, Wageningen University, Wageningen, Netherlands

S. P. Seitzinger

Institute of Marine and Coastal Sciences, Rutgers/NOAA CMER Program, Rutgers University, New Brunswick, New Jersey, USA

Here we describe, test, and apply a spatially explicit, global model for predicting dissolved inorganic nitrogen (DIN) export by rivers to coastal waters (NEWS-DIN). NEWS-DIN was developed as part of an internally consistent suite of global nutrient export models. Modeled and measured DIN export values agree well (calibration R2 = 0.79), and NEWS-DIN is relatively free of bias. NEWS-DIN predicts: DIN yields ranging from 0.0004 to 5217 kg N km−2 yr−1 with the highest DIN yields occurring in Europe and South East Asia; global DIN export to coastal waters of 25 Tg N yr−1, with 16 Tg N yr−1 from anthropogenic sources; biological N2 fixation is the dominant source of exported DIN; and globally, and on every continent except Africa, N fertilizer is the largest anthropogenic source of DIN export to coastal waters.

Received 17 February 2005; accepted 12 July 2005; published 14 October 2005.

Citation: Dumont, E., J. A. Harrison, C. Kroeze, E. J. Bakker, and S. P. Seitzinger (2005), Global distribution and sources of dissolved inorganic nitrogen export to the coastal zone: Results from a spatially explicit, global model, Global Biogeochem. Cycles, 19, GB4S02, doi:10.1029/2005GB002488.

Cited By

Please wait one moment ...