An enhanced two-source evapotranspiration model for land (ETEML): Algorithm and evaluation
By Yongmin Yang, Hongbo Su, Renhua Zhang, Jing Tian, Lu Li. 2015
67 citations recorded by the source corpus.
Satellite remote sensing provides a promising way to estimate regional evapotranspiration (ET) in a spatially distributed manner. In this study, an enhanced two-source evapotranspiration model for land (ETEML) is proposed based on a trapezoid framework of the vegetation fractional cover and land surface temperature (VFC/LST) space. In ETEML, a VFC/LST trapezoid space is theoretically defined for each pixel, and a pixel-wise mixed surface temperature decomposition method is proposed. ETEML is based on a two-source scheme, and the crop water stress index (CWSI) concept is applied to parameterize the soil evaporation and the vegetation transpiration separately. The proposed model was applied to the Soil Moisture-Atmosphere Coupling Experiment (SIVIACEX) site in central Iowa, USA. Evaluation with a remotely sensed dataset from Landsat was carried out to assess the performance of ETEML. Compared with the tower observations, the mean absolute deviation (MAD) and the root mean square deviation (RMSD) for the ETEML estimated latent heat flux (LE) are, respectively, 49 W/m(2) and 59 W/m(2), comparable to retrieval accuracies published in other studies. Comparison between ETEML and variations on a simpler trapezoid interpolation model (TIM1 and TIM2) indicates that ETEML reduces the subjectivity and uncertainties involved in TIM1 and TIM2. Overall, the results suggest that ETEML is promising and can expand the application of the trapezoid framework-based ET modeling approaches to heterogeneous surfaces. (C) 2015 Elsevier Inc. All rights reserved.
Subfields: Civil and Structural Engineering, Global and Planetary Change, Soil Science
View Paper: https://www.semanticscholar.org/paper/8fc617f654671f414414a82709fc4af58f9664a8
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In Global and Planetary Change
Citations in the corpus
- A Universal Ts‐VI Triangle Method for the Continuous Retrieval of Evaporative Fraction From MODIS Products (2017, background): “The development of a universal trapezoid model is a promising solution to overcome this weakness (Long et al., 2012; Long & Singh, 2012; Yang et al., 2015; Yang & Shang, 2013).”