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

The issue of using remotely sensed surface temperature to estimate the area -average sensible heat flux over surfaces made up of different vegetated pa tches has been investigated. The performance of three aggregation procedure s, ranging from physically based through semi-empirical, to entirely empiri cal has been assessed by comparing measured and simulated area-average sens ible heat flux. The results show that the physically based scheme perform v ery well. The performance of the entirely empirical scheme was reasonable b ut that of the semi-empirical scheme, which actually takes full advantage o f 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. Ther efore, future research should be directed towards building robust relations hips between model and observational variables directly at the large-scale. (C) 2000 Elsevier Science B.V. All rights reserved.