Estimation of Latent Heat Flux Using a Non-Parametric Method

The non-parametric (N-P) method expresses evapotranspiration as a function of net radiation, ground heat flux, air temperature, and surface temperature (Ts). This is relatively new attractive for estimating evapotranspiration, especially Ts measurements from remote sensing. purpose this study to investigate the limitations compare its performance with those Penman–Monteith (P–M) Priestley–Taylor (P–T) equations. Field experiments were carried out rates sensible fluxes above three different ecosystems: grassland, peat bog, forest. results show that grassland close equilibrium evaporation. Though forest humid (average humidity ≈ 89%; annual precipitation 2600 mm), was only 69% In terms model predictions, it found P–M P–T equations able predict water vapor well (R2 0.60–0.92; RMSE 30 W m−2) all sites if canopy resistance constant ecosystem given priori. However, N-P succeeded bog; failed site (RMSE 60 m−2). Our analyses field demonstrated be applicable, actual should within 0.89–1.05 times