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Global annual river discharge for a 0.5 degree resolution digital river network (blended, km3/yr per grid cell).

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

DescriptionAnnual River Discharge

This map shows annual river discharge for the globe on a 0.5 X 0.5 degree global river network. Blended river flow represents a composite of observed river discharge from the Global Runoff Data Centre and modeled river flow.

Interpretation

River discharge represents the accumulation of surface waters into river conduits ultimately conveyed to the ocean or other receiving water body. Discharge volumes are correlated with upstream drainage area and average upstream runoff. Larger and wetter basins typically have higher discharge rates. Climate change associated with greenhouse gas warming could result in a potential acceleration of the hydrologic cycle leading to greater frequency and intensity of extreme events like floods and drought. Drainage basins located in transitional zones between humid and arid zones such as the Sahelian region of Africa may be most vulnerable to shifts in climate. Areas affected by seasonally precipitation patterns such as the monsoon region of India also represent climatically sensitive drainage basins. A monthly climatology of the dataset is also available.

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

River discharge was computed as flow accumulated runoff along a 30-minute resolution digital river network (Fekete et al., 2001, Vörösmarty et al, 2000a,b). Observed river discharge records were obtained from the Global Runoff Data Centre, (Koblenz, Germany).

Citation

Please cite this map as: "GWSP Digital Water Atlas (2008). Map 39: Annual River Discharge (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

 
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