Simple model of the bare soil microwave emission at L-band

被引:103
作者
Escorihuela, Maria Jose
Kerr, Yann H.
de Rosnay, Patricia
Wigneron, Jean-Pierre
Calvet, Jean-Christophe
Lemaitre, Francois
机构
[1] Univ Toulouse 3, CESBIO, UMR 5126,Inst Rech Dev, CNRS,Ctr Natl Etud Spatiales, F-31401 Toulouse 9, France
[2] INRA, Bordeaux, France
[3] Meteo France, CNRS 1357, CNMR, F-1057 Toulouse, France
[4] Off Natl Etud & Rech Aerosp, F-31055 Toulouse 4, France
来源
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING | 2007年 / 45卷 / 07期
关键词
bare soil; emissivity; L-band radiometry; soil moisture; surface roughness;
D O I
10.1109/TGRS.2007.894935
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
A simple reflectivity model of a bare soil at L-band is developed to account for the effects of soil roughness at different angles and polarizations. This model was developed using a long-term dataset acquired over the bare soil in the framework of the Surface Monitoring Of the Soil Reservoir EXperiment (SMOSREX). It is shown that the roughness effects are different depending on the measurement configuration, in terms of incidence angle and polarization. However, in this paper, a simple parameterization that is based on a single roughness parameter was calibrated in order to account for this angular and polarization dependencies. This parameter was found to be dependent on soil moisture: drier conditions were associated to higher "roughness" conditions. The root-mean-square error between the measured and modeled reflectivities on days when no precipitation events were detected at vertical polarization (V-pol) is 0.0275, and at horizontal polarization (H-pol), the rmse is 0.0237; all incidence angles were considered. When all data are considered, the rmsd for V-pol is 0.0350, and for H-pol, the rinse is 0.0373. This new simple model is suitable for soil moisture retrieval from Soil Moisture and Ocean Salinity data. By means of this simple parameterization, almost two years of soil moisture data were retrieved with a good accuracy. The SMOSREX dataset allowed to ensure a long-term suitability of the proposed parameterization.
引用
收藏
页码:1978 / 1987
页数:10
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