Comparison of Large Aperture Scintillometer and Eddy Covariance Measurements: Can Thermal Infrared Data Be Used to Capture Footprint-Induced Differences?

Autor: H. A. R. De Bruin, A.G. Chehbouni, J.C.B. Hoedjes, R. Escadafal, Jamal Ezzahar
Přispěvatelé: Centre d'études spatiales de la biosphère (CESBIO), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Laboratoire de Mécanique des Fluides et Energétique (LMFE), Faculté des Sciences Semlalia [Marrakech], Université Cadi Ayyad [Marrakech] (UCA)-Université Cadi Ayyad [Marrakech] (UCA), Meteorology and Air Quality Department [Wageningen] (MAQ), Wageningen University and Research [Wageningen] (WUR), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Faculté des Sciences Semlalia Marrakech
Rok vydání: 2007
Předmět:
Meteorologie en Luchtkwaliteit
Atmospheric Science
stable boundary-layer
structure parameter
Meteorology and Air Quality
010504 meteorology & atmospheric sciences
sensible heat-flux
water-vapor
0207 environmental engineering
Eddy covariance
02 engineering and technology
Sensible heat
01 natural sciences
law.invention
Advanced Spaceborne Thermal Emission and Reflection Radiometer
[SDV.EE.ECO]Life Sciences [q-bio]/Ecology
environment/Ecosystems
law
Radiative transfer
Satellite imagery
020701 environmental engineering
0105 earth and related environmental sciences
Remote sensing
WIMEK
flevoland field experiment
convective conditions
13. Climate action
Scintillometer
atmospheric surface-layer
Environmental science
Spatial variability
frequency-response corrections
scintillation measurements
monin-obukhov similarity
Water vapor
Zdroj: Journal of Hydrometeorology, 8(2), 144-159
Journal of Hydrometeorology 8 (2007) 2
Journal of Hydrometeorology
Journal of Hydrometeorology, 2007, 8 (2), pp.194-206. ⟨10.1175/JHM561.1⟩
Journal of Hydrometeorology, American Meteorological Society, 2007, 8 (2), pp.194-206. ⟨10.1175/JHM561.1⟩
ISSN: 1525-7541
1525-755X
Popis: Eddy covariance (EC) and large aperture scintillometer (LAS) measurements were collected over an irrigated olive orchard near Marrakech, Morocco. The tall, sparse vegetation in the experimental site was relatively homogeneous, but during irrigation events spatial variability in soil humidity was large. This heterogeneity caused large differences between the source area characteristics of the EC system and the LAS, resulting in a large scatter when comparing sensible heat fluxes obtained from LAS and EC. Radiative surface temperatures were retrieved from thermal infrared satellite images from the Landsat Enhanced Thematical Mapper+ and Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) satellites. Using these images in combination with an analytical footprint model, footprint-weighted radiative surface temperatures for the footprints of the LAS and the EC system were calculated. Comparisons between the difference in measured sensible heat fluxes and the difference in footprint-weighted radiative surface temperature showed that for differences between the footprint-weighted radiative surface temperatures larger than ±0.5 K, correlations with the difference in measured sensible heat flux were good. It was found that radiative surface temperatures, obtained from thermal infrared satellite imagery, can provide a good indication of the spatial variability of soil humidity, and can be used to identify differences between LAS and EC measurements of sensible heat fluxes resulting from this variability.
Databáze: OpenAIRE
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