Wind Speed-Independent Two-Source Energy Balance Model Based on a Theoretical Trapezoidal Relationship between Land Surface Temperature and Fractional Vegetation Cover for Evapotranspiration Estimation
Joint Authors
Chen, Xiaohong
Wang, Wen
Wang, Xiao-Gang
Kang, Qing
Fu, Qing-Hua
Source
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-22, 22 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-02-14
Country of Publication
Egypt
No. of Pages
22
Main Subjects
Abstract EN
An accurate estimation of terrestrial evapotranspiration over heterogeneous surfaces using satellite imagery and few meteorological observations remains a challenging task.
Wind speed (u), which is known to exhibit high temporal-spatial variation, is a significant constraint in the abovementioned task.
In this study, a wind speed-independent two-source energy balance (WiTSEB) model is proposed on the basis of a theoretical land surface temperature (Tr)-fractional vegetation coverage (fc) trapezoidal space and a two-stage evapotranspiration decomposing method.
The temperatures in theoretically driest boundaries of the Tr-fc trapezoid are iteratively calculated without u by using an assumption of the absence of sensible heat exchange between water-saturated surface and atmosphere in the vertical direction under the given atmospheric condition.
The WiTSEB was conducted in HiWATER-MUSOEXE-12 in the middle reaches of the Heihe watershed across eight landscapes by using ASTER images.
Results indicate that WiTSEB provides reliable estimates in latent heat flux (LE), with root-mean-square-errors (RMSE) and coefficient of determination of 68.6 W m−2 and 0.88, respectively.
The RMSE of the ratio of the vegetation transpiration component to LE is 5.7%.
Sensitivity analysis indicates WiTSEB does not aggravate the sensitivity on meteorological and remote sensing inputs in comparison with other two-source models.
The errors of estimated Tr and observed soil heat flux result in LE overestimation/underestimation over parts of landscapes.
The two-stage evapotranspiration decomposing method is carefully verified by ground observation.
American Psychological Association (APA)
Wang, Xiao-Gang& Kang, Qing& Chen, Xiaohong& Wang, Wen& Fu, Qing-Hua. 2020. Wind Speed-Independent Two-Source Energy Balance Model Based on a Theoretical Trapezoidal Relationship between Land Surface Temperature and Fractional Vegetation Cover for Evapotranspiration Estimation. Advances in Meteorology،Vol. 2020, no. 2020, pp.1-22.
https://search.emarefa.net/detail/BIM-1126943
Modern Language Association (MLA)
Wang, Xiao-Gang…[et al.]. Wind Speed-Independent Two-Source Energy Balance Model Based on a Theoretical Trapezoidal Relationship between Land Surface Temperature and Fractional Vegetation Cover for Evapotranspiration Estimation. Advances in Meteorology No. 2020 (2020), pp.1-22.
https://search.emarefa.net/detail/BIM-1126943
American Medical Association (AMA)
Wang, Xiao-Gang& Kang, Qing& Chen, Xiaohong& Wang, Wen& Fu, Qing-Hua. Wind Speed-Independent Two-Source Energy Balance Model Based on a Theoretical Trapezoidal Relationship between Land Surface Temperature and Fractional Vegetation Cover for Evapotranspiration Estimation. Advances in Meteorology. 2020. Vol. 2020, no. 2020, pp.1-22.
https://search.emarefa.net/detail/BIM-1126943
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1126943