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	An enhanced two-source evapotranspiration model for land (ETEML): Algorithm and evaluation
	Yang Y. M.; Su, H. B.; Zhang, R. H.; Tian, J.; Li, L.
	2015
关键词	Evapotranspiration Remote sensing Two-source model Trapezoid surface-energy-balance latent-heat flux remote-sensing data triangle method regional evapotranspiration mapping evapotranspiration temperature observations agricultural landscape evaporative fraction canopy temperature
英文摘要	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.
出处	Remote Sensing of Environment
卷	168
页	54-65
收录类别	SCI
语种	英语
ISSN号	0034-4257
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/38975]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Yang Y. M.,Su, H. B.,Zhang, R. H.,et al. An enhanced two-source evapotranspiration model for land (ETEML): Algorithm and evaluation. 2015.

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