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Mean Annual Evapotranspiration 1950 - 2000 Print E-mail
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Global gridded fields of long-term average (1950-2000) evapotranspiration (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 Evapotranspiration 1950 - 2000

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

Interpretation

Evapotranspiration (ET) represents the transmission of soil and shallow groundwater into the atmosphere via surface evaporation and plant transpiration processes driven by temperature and moisture availability. ET levels are highest in warmer and wetter regions such as the tropics. ET decreases in colder regions and is lowest in arid regions due to low moisture availability. Climate change associated with greenhouse gas warming would impact ET levels due to changes in precipitation or temperature patterns. 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

Monthly evapotranspiration is computed from Shuttleworth and Wallace (1985) PET estimates (Vorosmarty et al, 1998) and used for input to the UNH Water Systems Analysis Group Water Balance Model (WBM) (Fekete et al., 2002) as well as ongoing analysis.

Citation

Please cite this map as: "GWSP Digital Water Atlas (2008). Map 37: Mean Annual Evapotranspiration 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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