Comparison of Three Remote Sensing Based Multi-Source Evapotranspiration Models
2020
V, Athira | Rajasekaran, Eswar | Boulet, Gilles | Indian Institute of Technology Bombay (IIT Bombay) | Centre d'études spatiales de la biosphère (CESBIO) ; Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) ; Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) ; Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) ; Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Indo-French Cell for Water Sciences = Cellule Franco Indienne de Recherche en Science de l’Eau (IFCWS = CEFIRSE) ; Indian Institute of Science [Bangalore] (IISc Bangalore)
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Show more [+] Less [-]English. Evapotranspiration (ET) links the energy, water and carbon cycles from local to global scales. Several remote sensing (RS) based models, with varying complexity and underlying physical concepts have been developed. Some of these models estimate total ET and some can partition ET into its constituent components. This study aims to compare three multi-source ET models, Priestley-Taylor-Jet Propulsion Lab (PT-JPL), Soil Plant Atmosphere and Remote Sensing Evapotranspiration (SPARSE) and Surface Temperature Initiated Closure (STIC) for their performance in simulating total ET and its components over four sites. The PT-JPL, SPARSE (layer), SPARSE (patch) and STIC models exhibited RMSE of 89.68, 57.3, 61.67 and 96.43 W m-2 respectively for the four sites taken together at half hourly time scales. In addition to differences in total ET simulated by the models, there was a remarkable difference between them in simulating the E and T components too. This clearly suggests that care must be taken when using these models to simulate ET and its components.
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