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Published byLorin Ray Modified over 9 years ago
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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
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Land Surface Satellite Satellite Image Aircraft LELE LELE MODEL
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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
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Irrigation Region 050 Km 25
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Airborne Flux Measurements wi = 109 Wm -2 btw = 43 Wm -2 NR ~ 1
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LE H B = 1.2 AIRBORNE B = 1.2 2-SOURCE B = 1.2 SEBAL
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Regional Fluxes 05 Km 2.5 B = 3.2 AIRBORNE B = 2.8 2-SOURCE B = 1.7 SEBAL
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Model Comparison Difference = 2-SOURCE - SEBAL Sensible Heat Flux DifferenceLatent Heat Flux Difference -1601600Wm -2 05 Km 2.505 Km 2.5
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Findings… Model estimates are Scale of surface heterogeneity is important… Model agreement… Pasture: good Sparse cover: poor
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This project was supported by: Australian Research Council University of Melbourne Hydrological Sciences Branch, NASA Goddard Space Flight Centre & Nanneella LandCare Group
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