Methods to aggregate turbulent fluxes over heterogeneous surfaces: Application to SALSA data set in Mexico

A. Chehbouni, C. Watts, Y. H. Kerr, G. Dedieu, J. C. Rodriguez, F. Santiago, P. Cayrol, G. Boulet, D. C. Goodrich

Research output: Contribution to conferencePaper

38 Scopus citations

Abstract

The issue of using remotely sensed surface temperature to estimate the area-average sensible heat flux over surfaces made up of different vegetated patches has been investigated. The performance of three aggregation procedures, ranging from physically based through semi-empirical, to entirely empirical has been assessed by comparing measured and simulated area-average sensible heat flux. The results show that the physically based scheme perform very well. The performance of the entirely empirical scheme was reasonable but that of the semi-empirical scheme, which actually takes full advantage of remotely sensed data, was very poor. This result suggests that unlike the case of surface fluxes, it is not appropriate to use relationships between model and observational variables (here radiative and aerodynamic surface temperature) that were developed and calibrated at a local/patch scale, for an application at a larger/grid scale just by scaling the parameters. Therefore, future research should be directed towards building robust relationships between model and observational variables directly at the large-scale. (C) 2000 Elsevier Science B.V.
Original languageAmerican English
Pages133-144
Number of pages12
DOIs
StatePublished - 20 Nov 2000
EventAgricultural and Forest Meteorology -
Duration: 20 Nov 2000 → …

Conference

ConferenceAgricultural and Forest Meteorology
Period20/11/00 → …

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