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contributor authorHoedjes, J. C. B.
contributor authorChehbouni, A.
contributor authorEzzahar, J.
contributor authorEscadafal, R.
contributor authorDe Bruin, H. A. R.
date accessioned2017-06-09T17:14:09Z
date available2017-06-09T17:14:09Z
date copyright2007/04/01
date issued2007
identifier issn1525-755X
identifier otherams-81567.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4224584
description abstractEddy 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.
publisherAmerican Meteorological Society
titleComparison of Large Aperture Scintillometer and Eddy Covariance Measurements: Can Thermal Infrared Data Be Used to Capture Footprint-Induced Differences?
typeJournal Paper
journal volume8
journal issue2
journal titleJournal of Hydrometeorology
identifier doi10.1175/JHM561.1
journal fristpage144
journal lastpage159
treeJournal of Hydrometeorology:;2007:;Volume( 008 ):;issue: 002
contenttypeFulltext


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