Mean Annual Surface Runoff 1950 - 2000 Print E-mail
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Global gridded fields of long-term average (1950-2000) surface runoff (mm/yr).

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

DescriptionMean Annual Surface Runoff 1950 - 2000

This map shows average annual surface runoff for the globe on a 0.5 X 0.5 degree global grid. Runoff field represents a long term annual average runoff (mm/yr) computed from monthly modeled runoff for years 1950-2000.

Interpretation

This map illustrates the complexity of runoff patterns across the globe. High runoff levels are evident across the tropics driven by high radiant energy and moisture in these regions. Runoff is lowest in the arid regions of the globe including the Saharan region of Africa, central Asia and Australia and western regions of North America and southern regions of South America. 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. Of critical importance are the transitional zones between humid and arid zones such as the Sahelian region of Africa. Areas affected by seasonally precipitation patterns such as the monsoon region of India also represent climatically sensitive regions. 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

Modeled runoff data represents output from the UNH Water Systems Analysis Group Water Balance Model (Fekete et al., 2002).

Citation

Please cite this map as: "GWSP Digital Water Atlas (2008). Map 38: Mean Annual Surface Runoff 1950 - 2000 (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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