Abstract
A Land Surface Microwave Emission Model (LSMEM) is calibrated and tested for frequencies between 1.4 and 19.4 GHz using observations of the Southern Great Plains 1999 Experiment (SGP99). Models of medium complexity like LSMEM are needed to solve the radiative transfer equation especially when vegetation is present. Such models involve, however, parameters which can not always be determined by direct observations. In the present study two missing parameters, the so-called vegetation structure parameter and the surface roughness height are determined by a calibration procedure. The calibration results in modified and frequency dependent parameterizations that allow physically consistent radiative transfer calculations for a large frequency range. For horizontal polarization these parameterizations are in good agreement with previous observational and theoretical studies. Errors for the calibrated parameters are estimated by cross-validation.
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