Abstract
C-band (5 GHz) active microwave instruments can be used to sense remotely the variations in space and time of soil moisture up to 5 or 10 cm below the surface. The thermal infrared radiance is also related to soil evaporation through the energy balance at the soil-air interface. If those two measurements are made simultaneously over a long period, it may be possible to monitor the actual evaporation and the soil water budget. Over a period of 10 days at the end of September 1983 airborne remote sensing equipment gave the surface temperature (from an infrared radiometer) and the surface water content (from a radar) of an essentially bare agricultural region. Using a Deardorff-like two-reservoir parameterization the evaporation and soil water budgets were derived from the remotely sensed data. To validate the results, the sensible heat fluxes derived are compared with regional fluxes measured using a vertical Doppler SODAR.
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