Home arrow Maps ... arrow alphabetic list arrow Nitrogen Load (Mobilizable)
Nitrogen Load (Mobilizable) Print E-mail
Go to: DescriptionDataset
Interactive Map

Mobilizable nitrogen loads (kgN/km2/yr per 0.5 degree grid cell) representing the amount of nitrogen on the land surface that is available to be transported to aquatic systems.

Map description and dataset provided by: Water Systems Analysis Group, Complex System Research Center, Institute for the Study of Earth, Oceans and Space, University of New Hampshire, USA

DescriptionNitrogen Load (Mobilizable)

Global, continental, regional, and coastline-specific estimates of nitrogen loadings onto the continental land mass are derived by applying a mass balance assessment of nitrogen loads to the landscape providing an accounting of nitrogen sources, uptake, transport and leakages to terrestrial and riverine systems. Nitrogen loads to the land mass include sewered and non-sewered human wastes, atmospheric deposition, fixation from natural vegetation and cropland, industrial fertilizers, and livestock emissions. Largest contemporary loads are seen in central and eastern North America, throughout Europe, and in southern and southeastern Asia. For the contemporary state the largest mobilizable nitrogen load contributors continue to be fixation followed by livestock, fertilizer, deposition and human loading, in that order.

Interpretation

This indicator provides a measure of potential water pollution by explicitly mapping out the extent of both natural and anthropogenic nitrogen loading to the land and aquatic systems. Compared to the pre-industrial condition, nitrogen loading to the landmass has doubled due to anthropogenic activities. This is particularly evident in the industrialized areas of the globe where contemporary levels of nitrogen loading have increased up to 6-fold in many areas. The quantity of nitrogen loaded to the landscape has shifted from a chiefly fixation-based system (89% of total loads) in the pre-industrial state to a heterogeneous mix in contemporary times where fertilizer (15%), livestock (24%) and atmospheric deposition (15%) dominate in many parts of the industrialized and developing world.

Source

The dataset for this map was provided by: Charles J. Vörösmarty, Water Systems Analysis Group, Complex System Research Center, Institute for the Study of Earth, Oceans and Space, University of New Hampshire, USA

Background

This dataset was developed in support of analysis outlined in Green et al., 2004 and was initially spearheaded as a part of the International SCOPE Nitrogen Project, which received support from both the Mellon Foundation and from the National Center for Ecological Analysis and Synthesis (NCEAS) in Santa Barbara, California.

Citation

Please cite this map as: "GWSP Digital Water Atlas (2008). Map 48: Nitrogen Load (Mobilizable) (V1.0). Available online at http://atlas.gwsp.org."

Contact Information

Charles J. Vörösmarty, Water Systems Analysis Group, Complex System Research Center, Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, NH USA 03824, This e-mail address is being protected from spam bots, you need JavaScript enabled to view it , Phone: +01.603.862.0850, Fax: +01.603.8

 
< Prev   Next >
© 2017 GWSP Digital Water Atlas
Joomla! is Free Software released under the GNU/GPL License.