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Accounting for atmospheric boundary layer variability on flux estimation from RS observations Inra
Timmermans, W.J.; Bertoldi, G.; Albertson, J.D.; Olioso, A.; Su, Z.; Gieske, A.S.M..
A Large Eddy Simulation (LES) model is coupled to a remote-sensing-basedSVAT that accounts for soil and vegetation in order to study the feedback effectsbetween surface state and spatial variability in fluxes, through the induction ofspatial variability in the lower atmosphere. As such, this study focuses on sensibleheat flux exchange. The simulations indicated that changes are introduced to theflux distributions mainly at higher surface temperatures. A scale-dependentmethod is presented to account for feedback effects. This showed the mostsignificant correlation between surface and air temperature at scales from 500 to1000m and modulated the spatial variance of sensible heat flux. This suggeststhat feedback effects act to limit the spatial variability in...
Tipo: Journal Article Palavras-chave: REMOTE SENSING; MODELLING; LARGE EDDY SIMULATION; LES; SVAT; HEAT FLUX EXCHANGE.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200838de219f&uri=/notices/prodinra1/2008/09/
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Footprint issues in scintillometry over heterogeneous landscapes Inra
Timmermans, W.J.; Su, Z.; Olioso, A..
Scintillometry is widely recognized as a potential tool for obtaining spatially aggregated sensible heat fluxes. Although many investigations have been made over contrasting component surfaces, few aggregation schemes consider footprint contributions. In this paper an approach is 5 presented to infer average sensible heat flux over a very heterogeneous landscape by using a large aperture scintillometer. The methodology isdemonstrated on simulated data and tested on a time series of measurements obtained during the SPARC2004 experiment in Barrax, Spain. Results show that the two-dimensional footprint approach yields more accurate results of aggregated sensible heat flux than traditional methods
Tipo: Journal Article Palavras-chave: SCINTILLOMETRIE; HETEROGENEITE SPATIALE HEAT FLUXES; SCINTILLOMETRY; FOOTPRINT.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20095eca5c95&uri=/notices/prodinra1/2011/03/
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