A GIS analysis of the spatial relation between evapotranspiration and pan evaporation in the United States

Sami Khanal, Shrinidhi Ambinakudige and John Rodgers

Water International, 2013, vol. 38, issue 3, 353-360

Abstract: Despite increases in global temperature, studies have observed a decrease in evaporation in the Northern Hemisphere. To examine whether a decrease in pan evaporation also indicates decreased evapotranspiration (ET), ET rates were modelled in a geographic information system by integrating climatic data and water-balance data from 1997 to 2007. Average monthly ET values were compared with National Climatic Data Center pan-evaporation (PE) data. PE and ET were significantly related, but the degree of significance and the direction of the relation (positive or negative) varied across eco-divisions and seasons. Thus, decreased pan evaporation does not necessarily imply that ET will decrease as well.

Date: 2013
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DOI: 10.1080/02508060.2013.769075

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