Testing Remotely Sensed Evapotranspiration Estimates Using Airborne and Ground Measurements May 2004 Cressida Savige, Andrew French, Andrew Western, Jeffrey Walker, Mohammad Abuzar, Jorg Hacker and Jetse Kalma
Land Surface Satellite Satellite Image Aircraft LELE LELE MODEL
Surface Energy Balance R n = H + LE + G R nC LE C HSHS R nS LE S HCHC G 2-SOURCE G H RnRn LE 1-SOURCE
Irrigation Region 050 Km 25
Airborne Flux Measurements wi = 109 Wm -2 btw = 43 Wm -2 NR ~ 1
LE H B = 1.2 AIRBORNE B = SOURCE B = 1.2 SEBAL
Regional Fluxes 05 Km 2.5 B = 3.2 AIRBORNE B = SOURCE B = 1.7 SEBAL
Model Comparison Difference = 2-SOURCE - SEBAL Sensible Heat Flux DifferenceLatent Heat Flux Difference Wm Km Km 2.5
Findings… Model estimates are Scale of surface heterogeneity is important… Model agreement… Pasture: good Sparse cover: poor
This project was supported by: Australian Research Council University of Melbourne Hydrological Sciences Branch, NASA Goddard Space Flight Centre & Nanneella LandCare Group