Daily Evapotranspiration Estimations by Direct Calculation and Temporal Upscaling Based on Field and MODIS Data

Daily evapotranspiration (ET) integration is essential to various applications of agricultural water planning and management, ecohydrology, energy balance studies. The constant reference evaporative fraction (EFr) temporal upscaling method has been proven be efficient in extrapolating instantaneous ET a daily timescale. Unlike methods, the direct calculation (DC) developed our previous study directly estimates without calculating ET. present aimed compare estimations using EFr DC methods based on field MODIS data at site from ChinaFLUX network. estimation results were validated by eddy covariance (EC) both with correction imbalance. Based data, show that (i) performed higher accuracy when compared uncorrected EC measurements, while was overestimated; (ii) still better after corrected Residual Energy scheme, overestimations significantly decreased; (iii) best Bowen Ratio scheme. satellite reveal overestimated mean-bias-error (MBE) 5.6 W/m2, root-mean-square error (RMSE) 18.6 W/m2; underestimated smaller MBE −4.8 W/m2 an RMSE 22.5 W/m2. Therefore, similar or performance than widely used can estimate effectively.