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AGU: Geophysical Research Letters

 

Index Terms

  • Hydrology: Remote sensing
  • Hydrology: Soil moisture
  • Hydrology: Instruments and techniques: monitoring

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 33, L07405, 4 PP., 2006
doi:10.1029/2006GL025724

A new parameterization of the effective temperature for L band radiometry

T. R. H. Holmes

Centre d'Etudes Spatiales de la Biosphère, UMR 5126, UPS, CNRS, CNES, IRD, Toulouse, France

P. de Rosnay

Centre d'Etudes Spatiales de la Biosphère, UMR 5126, UPS, CNRS, CNES, IRD, Toulouse, France

R. de Jeu

Department of Hydrology and Geo-Environmental Sciences, Faculty of Earth and Life Sciences, Vrije Universiteit Amsterdam, Amsterdam, Netherlands

R. J.-P. Wigneron

Institut National de la Recherche Agronomiques, Ecologie Fonctionnelle et Physique de l'Environnement, Bordeaux, France

Y. Kerr

Centre d'Etudes Spatiales de la Biosphère, UMR 5126, UPS, CNRS, CNES, IRD, Toulouse, France

J.-C. Calvet

Météo France, CNRM, GAME, URA CNRS 1357, Toulouse, France

M. J. Escorihuela

Centre d'Etudes Spatiales de la Biosphère, UMR 5126, UPS, CNRS, CNES, IRD, Toulouse, France

K. Saleh

Institut National de la Recherche Agronomiques, Ecologie Fonctionnelle et Physique de l'Environnement, Bordeaux, France

F. Lemaître

Office National d'Etudes et de Recherches Aérospatiales, Toulouse, France

An accurate value of the effective temperature is critical for soil emissivity retrieval, and hence soil moisture content retrieval, from passive microwave observations. Computation of the effective temperature needs fine profile measurements of soil temperature and soil moisture. The availability of a two year long data set of these surface variables from SMOSREX (Surface Monitoring Of the Soil Reservoir EXperiment) makes it possible to study the effective temperature at the seasonal to interannual scale. This study shows that present parameterizations do not adequately describe the seasonal variations in sensing depth. Therefore, a new parameterization is proposed that is stable at the seasonal to interannual scales while retaining simplicity.

Received 10 January 2006; accepted 1 March 2006; published 13 April 2006.

Citation: Holmes, T. R. H., P. de Rosnay, R. de Jeu, R. J.-P. Wigneron, Y. Kerr, J.-C. Calvet, M. J. Escorihuela, K. Saleh, and F. Lemaître (2006), A new parameterization of the effective temperature for L band radiometry, Geophys. Res. Lett., 33, L07405, doi:10.1029/2006GL025724.

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