Testing Remotely Sensed Evapotranspiration Estimates Using Airborne and Ground Measurements May 2004 Cressida Savige, Andrew French, Andrew Western, Jeffrey.

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Presentation transcript:

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