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L-band Microwave Emission of the Biosphere (L-MEB) Model: Description and calibration against experimental data sets over crop fields

Jean-Pierre Wigneron 1 Yann H. Kerr 2 Philippe Waldteufel 3 Kauzar Saleh Contell 1 Maria-José Escorihuela 2 Philippe Richaume 2 Paolo Ferrazzoli 4 Patricia de Rosnay 2 Robert Gurney 5 Jean-Christophe Calvet 6 Jennifer P. Grant 7 Massimo Guglielmetti 8 Brian K. Hornbuckle 9 Christian Matzler 10 Thierry Pellarin 11 Mike Schwank 8
1 EPHYSE - Écologie fonctionnelle et physique de l'environnement
2 CESBIO - Centre d'études spatiales de la biosphère
3 SA - Service d'aéronomie
4 Università degli Studi di Roma Tor Vergata [Roma]
5 NERC - Natural Environment Research Council
6 CNRM - Centre national de recherches météorologiques
7 FALW - Faculty of Earth and Life Sciences [Amsterdam]
8 D-INFK - Department of Computer Science [ETH Zürich]
9 ISU - Iowa State University
10 IAP - Institute of Applied Physics [Bern]
11 LTHE - Laboratoire d'étude des transferts en hydrologie et environnement
Abstract : In the near future, the SMOS (Soil Moisture and Ocean Salinity) mission will provide global maps of surface soil moisture (SM). The SMOS baseline payload is an L-band (1.4 GHz) two dimensional interferometric microwave radiometer which will provide multi-angular and dual-polarization observations. In the framework of the ground segment activities for the SMOS mission an operational SMOS Level 2 Soil Moisture algorithm was developed. The principle of the algorithm is to exploit multi-angular data in order to retrieve simultaneously several surface parameters including soil moisture and vegetation characteristics. The algorithm uses an iterative approach, minimizing a cost function computed from the differences between measured and modelled brightness temperature (TB) data, for all available incidence angles. In the algorithm, the selected forward model is the so-called L-MEB (L-band Microwave Emission of the Biosphere) model which was the result of an extensive review of the current knowledge of the microwave emission of various land covers. This model is a key element in the SMOS L2 algorithm and could be used in future assimilation studies. There is thus a strong need for a reference study, describing the model and its implementation. In order to address these needs a detailed description of soil and vegetation modelling in L-MEB is given in this study. In a second step, the use of L-MEB in soil moisture retrievals is evaluated for several experimental data sets over agricultural crops. Calibrations of the soil and vegetation L-MEB parameters are investigated for corn, soybean and wheat. Over the different experiments, very consistent results are obtained for each vegetation type in terms of calibration and soil moisture retrievals.
keyword : Inversion Modelling Soil moisture Passive microwave SMOS Soil Vegetation L-MEB Algorithm
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https://hal-insu.archives-ouvertes.fr/insu-00387991
Contributor : Thierry Pellarin Connect in order to contact the contributor
Submitted on : Tuesday, May 26, 2009 - 11:10:56 AM
Last modification on : Monday, May 16, 2022 - 8:20:27 AM

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INSU | METEO | CNRS | INRA | OMP-CESBIO | OMP | UPMC | UVSQ | AERONOMIE | SORBONNE-UNIVERSITE | UNIV-TLSE3 | IRSTEA | UNIV-SAVOIE | INRAE | UGA

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Jean-Pierre Wigneron, Yann H. Kerr, Philippe Waldteufel, Kauzar Saleh Contell, Maria-José Escorihuela, et al.. L-band Microwave Emission of the Biosphere (L-MEB) Model: Description and calibration against experimental data sets over crop fields. Remote Sensing of Environment, Elsevier, 2007, 107 (4), pp.639 à 655. ⟨10.1016/j.rse.2006.10.014⟩. ⟨insu-00387991⟩

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