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Spatialization of sensible heat flux over a heterogeneous landscape

Abstract : Two methods for retrieving sensible heat flux over a bare soil/wheat composite surface are compared. The first one is based on field measurements using large aperture scintillometers. The comparison with reference fluxes obtained from eddy correlation technique shows that scintillometry-derived fluxes are overestimated by 10%. A numerical experiment demonstrates this is induced by the non-uniform sensitivity of the scintillometer to C $_{\rm N}^2$ along the path length which follows a `bell-shaped' curve. The second method is based on the use of a simple surface energy balance model, SEBAL, supplied with high spatial resolution remote sensing data from two airborne sensors in visible, near infrared and TIR bands. A comparison with scintillometry-derived fluxes shows important discrepancies. These result from large errors in the estimation of the roughness length z 0 in the model. This demonstrates that the use of an empirical relationship based on NDVI only is inadequate for inferring this key parameter in SEBAL.
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https://hal.inrae.fr/hal-02681070
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Jean-Pierre Lagouarde, Frederic Jacob, Xing Fa Fa Gu, Albert Olioso, Jean-Marc Bonnefond, et al.. Spatialization of sensible heat flux over a heterogeneous landscape. Agronomie, EDP Sciences, 2002, 22 (6), pp.627-633. ⟨10.1051/agro:2002032⟩. ⟨hal-02681070⟩

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