Authors
Juan Pablo Guerschman, Albert IJM Van Dijk, Guillaume Mattersdorf, Jason Beringer, Lindsay B Hutley, Ray Leuning, Robert C Pipunic, Brad S Sherman
Publication date
2009/5/5
Journal
Journal of hydrology
Volume
369
Issue
1-2
Pages
107-119
Publisher
Elsevier
Description
We developed a new algorithm for estimating monthly actual evapotranspiration (AET) based on surface reflectance from MODIS-Terra and interpolated climate data. The algorithm uses monthly values of the Enhanced Vegetation Index (EVI) and the Global Vegetation Moisture Index (GVMI) derived from the MODIS nadir bidirectional reflectance distribution function – adjusted reflectance product (MOD43B4) to scale Priestley-Taylor potential evapotranspiration derived from the climate surfaces. The EVI is associated with evapotranspiration through its relationship with leaf area index. The GVMI allows separation between surface water and bare soil when EVI is low and provides information on vegetation water content when EVI is high. The model was calibrated using observed AET data from seven sites in Australia, including two forests, two open savannas, a grassland, a floodplain and a lake. Model outputs …
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