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Effective temperature for L-band radiometry

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HAL Id: hal-02815255

https://hal.inrae.fr/hal-02815255

Submitted on 6 Jun 2020

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Effective temperature for L-band radiometry

Patricia de Rosnay, Jean-Pierre Wigneron, Maria-José Escorihuela, Thomas Holmes, Yann H. Kerr, Jean-Christophe Calvet

To cite this version:

Patricia de Rosnay, Jean-Pierre Wigneron, Maria-José Escorihuela, Thomas Holmes, Yann H. Kerr, et al.. Effective temperature for L-band radiometry. 1. Workshop on Remote Sensing and Modeling of Surface Properties, Jun 2006, Paris, France. 1 p. �hal-02815255�

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1st Workshop on Remote Sensing and Modeling of Surface Properties 20-22 June 2006 , Paris, France

Observatoire de Paris 61 avenue de l'Observatoire 75014 Paris, France

Effective temperature for L-band radiometry

P. DE ROSNAY

1

, J-P WIGNERON

2

, ESCORIHUELA, M.J.

1

, T. HOLMES

2,3

, Y. KERR

1

, J.C. CALVET

4

1

CESBIO (CNRS, CNES, IRD, UPS), Toulouse, France

2

INRA, EPHYSE, Villenave d'Ornon, France

3

NASA/Goddard Space Flight Center, Greenbelt, USA

4

Météo-France/CNRM, Toulouse, France

Abstract: 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 three-year long data set of these surface variables from SMOSREX (Surface Monitoring Of the Soil Reservoir Experiment) makes it possible to study the features of the effective temperature at L-band and the IR temperature of the surface at the seasonal to the inter annual scale. This paper reviews the main parameterizations of the effective

temperature which have been proposed in the literature by Choudhury et al. (1982), Wigneron

et al. (2001) and Holmes et al. (2006). An inter-comparison and validation of the effective

temperature models at the inter-annual time scale is performed. Based on the SMOSREX data

set, the paper investigates the effective temperature dependency to soil moisture and the

effects on the retrieved soil emissivity. The 3-year long SMOSREX data set is used to

investigate the features of the L-band emissivity at both vertical and horizontal polarizations,

under various conditions of soil moisture soil temperature, and soil roughness.

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