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Evaluation and calibration of a microwave emission model using the Southern Great Plains 1999 experiment data set

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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.

Das Mikrowellen-Emissionsmodell LSMEM für Landoberflächen (Land Surface Microwave Emission Model) wird anhand von Messungen des Southern Great Plains 1999 Experimentes (SGP99) für Frequenzen zwischen 1.4 und 19.4 GHz kalibriert und getestet. Insbesondere wenn Vegetation berücksichtigt werden muss, werden für die Lösung der Strahlungstransportgleichung komplexere Modelle wie beispielsweise das LSMEM benötigt, deren Parameter allerdings nicht immer vollständig aus Beobachtungen abgeschätzt werden können. In der vorliegenden Studie werden zwei fehlende Parameter, der Vegetationsstrukturparameter und die Rauhigkeitshöhe der Oberfläche durch eine Modellkalibration bestimmt. Die Kalibration führt zu modifizierten und frequenzabhängigen Parametrisierungen, die physikalisch konsistente Strahlungstransportmodellierungen in einem weiten Frequenzbereich ermöglichen. Bei horizontaler Polarisation sind diese Parametrisierungen in guter Übereinstimmung mit früheren Messungen und theoretischen Studien. Die Fehler der kalibrierten Größen werden durch eine Kreuzvalidation abgeschätzt.

Document Type: Research Article


Publication date: April 1, 2007

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  • Meteorologische Zeitschrift (originally founded in 1866) is the joint periodical of the meteorological societies of Austria, Germany and Switzerland. It accepts high-quality peer-reviewed manuscripts on all aspects of observational, theoretical and computational research out of the entire field of meteorology, including climatology. Meteorologische Zeitschrift represents a natural forum for the meteorological community of Central Europe and worldwide.
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