Evaluating Soil Resistance Formulations in Thermal‐Based Two‐Source Energy Balance (TSEB) Model: Implications for Heterogeneous Semiarid and Arid Regions
Visualitza/Obre
Autor/a
Li, Yan
Kustas, William P.
Huang, Chunlin
Nieto, Hector
Haghighi, Erfan
Anderson, Martha C.
Domingo, Francisco
Garcia, Monica
Scott, Russell L.
Data de publicació
2018-11-26ISSN
0043-1397
Resum
Relatively small fluctuations in the surface energy balance and evapotranspiration in semiarid and arid regions can be indicative of significant changes to ecosystem health. Therefore, it is imperative to have approaches for monitoring surface fluxes in these regions. The remote sensing‐based two‐source energy balance (TSEB) model is a suitable method for flux estimation over sparsely vegetated semiarid and arid landscapes since it explicitly considers surface energy flux contributions from soil and vegetation. However, previous studies indicate that TSEB generally underestimates sensible heat flux (H) and hence overestimates latent heat flux (LE) or evapotranspiration for these regions unless soil resistance coefficients are modified based on additional ground information. In this study, TSEB is applied over semiarid and arid regions on three continents using the original soil resistance formulation with modified coefficients and a recently developed physically based soil resistance formulation. Model sensitivity analysis demonstrates the high sensitivity of TSEB with original soil resistance formulation to soil resistance coefficients, while TSEB with the new soil resistance formulation has relatively low sensitivity to uncertainties in all coefficients. The performance of TSEB using different soil resistance formulations is evaluated by comparing modeled H against eddy covariance measurements in six semiarid and arid study sites and ranking the error statistics. Our results indicate that incorporating the new soil resistance formulation into TSEB would enhance its utility in flux estimation over heterogeneous landscapes by obviating its reliance on semiempirical coefficients and thus provide more robust fluxes over sparsely vegetated regions without model calibration and/or parameter tuning.
Tipus de document
Article
Versió del document
Versió publicada
Llengua
English
Matèries (CDU)
631 - Agricultura. Agronomia. Maquinària agrícola. Sòls. Edafologia agrícola
Pàgines
21
Publicat per
Wiley
Publicat a
Water Resources Research
Citació
Li, Yan, William P. Kustas, Chunlin Huang, Hector Nieto, Erfan Haghighi, Martha C. Anderson, Francisco Domingo, Monica Garcia, and Russell L. Scott. 2019. "Evaluating Soil Resistance Formulations In Thermal‐Based Two‐Source Energy Balance (TSEB) Model: Implications For Heterogeneous Semiarid And Arid Regions". Water Resources Research 55 (2): 1059-1078. doi:10.1029/2018wr022981.
Número de l'acord de la subvenció
MINECO/Programa Estatal de fomento de la investigación científica y técnica de excelencia/CGL2016‐78075‐P/ES/DINAMICA DE BIOCOSTRAS/DINCOS
Programa
Ús Eficient de l'Aigua en Agricultura
Aquest element apareix en la col·lecció o col·leccions següent(s)
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Drets
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