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Open AccessArticle

Vegetation Water Use Based on a Thermal and Optical Remote Sensing Model in the Mediterranean Region of Doñana

1
Departamento de Ingeniería Agroforestal, ETSIAAB, Universidad Politécnica de Madrid, Avenida Complutense 3, 28040 Madrid, Spain
2
Department of Environmental Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
3
Departamento de Sistemas y Recursos Naturales, ETSIMFMN, Universidad Politécnica de Madrid, C/José Antonio Novais 10, 28040 Madrid, Spain
4
Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109, USA
5
German Centre for Integrative Biodiversity Research (iDiv) Halle-JenaLeipzig, Deutscher Platz 5e, 04103 Leipzig, Germany
6
International Research Institute for Climate and Society, The Earth Institute, Columbia University, Palisades, NY 10027, USA
*
Author to whom correspondence should be addressed.
Remote Sens. 2018, 10(7), 1105; https://doi.org/10.3390/rs10071105
Received: 8 May 2018 / Revised: 9 June 2018 / Accepted: 4 July 2018 / Published: 11 July 2018
(This article belongs to the Special Issue Advances in the Remote Sensing of Terrestrial Evaporation)
Terrestrial evapotranspiration (ET) is a central process in the climate system, is a major component in the terrestrial water budget, and is responsible for the distribution of water and energy on land surfaces especially in arid and semiarid areas. In order to inform water management decisions especially in scarce water environments, it is important to assess ET vegetation use by differentiating irrigated socio-economic areas and natural ecosystems. The global remote sensing ET product MOD16 has proven to underestimate ET in semiarid regions where ET is very sensitive to soil moisture. The objective of this research was to test whether a modified version of the remote sensing ET model PT-JPL, proven to perform well in drylands at Eddy Covariance flux sites using the land surface temperature as a proxy to the surface moisture status (PT-JPL-thermal), could be up-scaled at regional levels introducing also a new formulation for net radiation from various MODIS products. We applied three methods to track the spatial and temporal characteristics of ET in the World Heritage UNESCO Doñana region: (i) a locally calibrated hydrological model (WATEN), (ii) the PT-JPL-thermal, and (iii) the global remote sensing ET product MOD16. The PT-JPL-thermal showed strong agreement with the WATEN ET in-situ calibrated estimates (ρ = 0.78, ρ1month-lag = 0.94) even though the MOD16 product did not (ρ = 0.48). The PT-JPL-thermal approach has proven to be a robust remote sensing model for detecting ET at a regional level in Mediterranean environments and it requires only air temperature and incoming solar radiation from climatic databases apart from freely available satellite products. View Full-Text
Keywords: evapotranspiration; remote sensing; PT-JPL; WATEN; MOD16; hydrological model; thermal; Doñana; irrigation; wetland evapotranspiration; remote sensing; PT-JPL; WATEN; MOD16; hydrological model; thermal; Doñana; irrigation; wetland
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Moyano, M.C.; Garcia, M.; Palacios-Orueta, A.; Tornos, L.; Fisher, J.B.; Fernández, N.; Recuero, L.; Juana, L. Vegetation Water Use Based on a Thermal and Optical Remote Sensing Model in the Mediterranean Region of Doñana. Remote Sens. 2018, 10, 1105.

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