Vegetation water use based on a thermal and optical remote sensing model in the mediterranean region of Doñana

Research output: Research - peer-reviewJournal article – Annual report year: 2018

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DOI

  • Author: Moyano, Maria C.

    Universidad Politecnica de Madrid, Spain

  • Author: Garcia, Monica

    Air, Land & Water Resources, Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet, 2800, Kgs. Lyngby, Denmark

  • Author: Palacios-Orueta, Alicia

    Universidad Politecnica de Madrid, Spain

  • Author: Tornos, Lucia

    Universidad Politecnica de Madrid, Spain

  • Author: Fisher, Joshua B.

    California Institute of Technology, United States

  • Author: Fernandez, Nestor

    German Centre for Integrative Biodiversity Research, Germany

  • Author: Recuero, Laura

    Universidad Politecnica de Madrid, Spain

  • Author: de Juana, Luis

    Universidad Politecnica de Madrid, Spain

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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 theWATEN ET in-situ calibrated estimates (r = 0.78, ρ1month-lag = 0.94) even though the MOD16 product did not (r = 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.
Original languageEnglish
Article number1105
JournalRemote Sensing
Volume10
Issue number7
Number of pages23
ISSN2072-4292
DOIs
StatePublished - 2018
CitationsWeb of Science® Times Cited: 0

    Research areas

  • Evapotranspiration;, Remote sensing, PT-JPL, WATEN, MOD16, Hydrological model, Termal, Doñana, Irrigation, Wetland
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