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Content archived on 2024-04-15

SPATIAL VARIABILITY OF LAND-SURFACE PROCESSES

Objective



FIVE MAIN STEPS WILL BE FOLLOWED. WE WILL :

I) USE FINER-SCALE, HIGHER-FREQUENCY, RADIOSOUNDING NETWORK ON THE ONE HAND, AND MESO-SCALE ANALYSIS AND MODEL-ASSIMILATION ON THE OTHER HAND, IN ORDER TO BETTER DESCRIBE THE "LARGE-SCALE" ATMOSPHERIC FORCING ACTING ON LAND-SURFACE PROCESSES ;

II) USE THE ABOVE LARGE-SCALE ATMOSPHERIC FORCING AND THE 13 LOCAL MEASUREMENTS OF EVAPORATION FLUXES AND RELATED SURFACE PARAMETERS TAKEN AT THE SPECIALLY INSTRUMENTED MICROMETEOROLOGICAL STATIONS AND THE FOREST MAST, TO CALIBRATE UP TO 13 VERSIONS OF A SIMPLE ONE-DIMENSIONAL LAND-SURFACE MODEL ;

III) USE SURFACE FIELDS OF VARIOUS PARAMETERS, E.G. ALBEDO, EMISSIVITY, TYPE OF SOIL, TYPE AND MATURITY OF VEGETATION,... TO DISTINGUISH BETWEEN AT MOST 13 DIFFERENT CLASSES OF SURFACE CHARACTERISTICS, EACH OF WHICH BEING POSSIBLY DESCRIBED BY ONE OF THE ABOVE LAND-SURFACE MODELS ;

IV) IMPLEMENT THE THREE-DIMENSIONAL NUMERICAL MODEL WITH SURFACE FEATURES AND PARAMETERIZATION SCHEMES VARYING HORIZONTALLY ACCORDING TO STEPS (II) AND (III), AND ESTIMATE FROM IT THE TOTAL EVAPORATION FLUX OVER THE HM86 NETWORK AS WELL AS THE EFFECTIVE EVAPORATION FLUX CORRESPONDING TO THE FLIGHT PATH OF THE INSTRUMENTED AIRPLANE ;

V) COMPARE THE "MODEL" AIRPLANE FLUX TO THE OBSERVED ONE, AND RESOLVE POSSIBLE DISCREPENCIES BY GOING BACK TO STEP (I) FOR DEFINING THE ATMOSPHERIC FORCING OR TO STEP (III) FOR MODIFYING THE PORTION OF THE TOTAL AREA WHERE A GIVEN TRANSFER MODEL IS SUPPOSED TO BE REPRESENTATIVE.

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Coordinator

Centre National de la Recherche Scientifique (CNRS)
EU contribution
No data
Address
16 avenue Édouard-Belin
31054 Toulouse
France

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Total cost

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Participants (6)

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