Influence of Component Temperature Derivation from Dual Angle Thermal Infrared Observations on TSEB Flux Estimates Over an Irrigated Vineyard

• Published in: Acta geophysica Vol. 63; no. 6; pp. 1540 - 1570
• Main Authors: Andreu, Ana, Timmermans, Wim J., Skokovic, Drazen, Gonzalez-Dugo, Maria P.
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.12.2015; De Gruyter Open; Springer Nature B.V
• Subjects: Atmospheric sciences; available energy; Canopies; component temperatures; Earth and Environmental Science; Earth Sciences; Geophysics/Geodesy; Geotechnical Engineering & Applied Earth Sciences; Hydrology; Latent heat; resistance schemes; Structural Geology; Temperature; Two Source Energy Balance (TSEB) model; Wineries & vineyards; resistance schemes; Two Source Energy Balance (TSEB) model; component temperatures; available energy
• ISSN: 1895-6572; 1895-7455
• DOI: 10.1515/acgeo-2015-0037

ab]Abstract A two-source model for deriving surface energy fluxes and their soil and canopy components was evaluated using multi-angle airborne observations. In the original formulation (TSEB1), a single temperature observation, Priestley—Taylor parameterization and the vegetation fraction are used to derive the component fluxes. When temperature observations are made from different angles, soil and canopy temperatures can be extracted directly. Two dual angle model versions are compared versus TSEB1: one incorporating the Priestley—Taylor parameterization (TSEB2I) and one using the component temperatures directly (TSEB2D), for which data from airborne campaigns over an agricultural area in Spain are used. Validation of TSEB1 versus ground measurements showed RMSD values of 28 and 10 Wm −2 for sensible and latent heat fluxes, respectively. Reasonable agreement between TSEB1 and TSEB2I was found, but a rather low correlation between TSEB1 and TSEB2D was observed. The TSEB2D estimates appear to be more realistic under the given conditions.