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Calibration of the L-MEB Model Over a Coniferous and a Deciduous Forest.

Authors :
Grant, Jennifer P.
Saleh-Contell, Kauzar
Wigneron, Jean-Pierre
Guglielmetti, Massimo
Kerr, Yann H.
Schwank, Mike
Skou, Niels
De Griend, Adriaan A. Van
Source :
IEEE Transactions on Geoscience & Remote Sensing. Mar2008, Vol. 46 Issue 3, p808-818. 11p.
Publication Year :
2008

Abstract

In this paper, the L-band Microwave Emission of the Biosphere (L-MEB) model used in the Soil Moisture and Ocean Salinity (SMOS) Level 2 Soil Moisture algorithm is calibrated using L-band (1.4 GHz) microwave measurements over a coniferous (Pine) and a deciduous (mixed/Beech) forest. This resulted in working values of the main canopy parameters optical depth (τ), single scattering albedo (ω), and structural parameters tt(H) and tt(V), besides the soil roughness parameters HR and NR. Using these calibrated values in the forward model resulted in a root mean-square error in brightness temperatures from 2.8 to 3.8 K, depending on data set and polarization. Furthermore, the relationship between canopy optical depth and leaf area index is investigated for the deciduous site. Finally, a sensitivity study is conducted for the focus parameters, temperature, soil moisture, and precipitation. The results found in this paper will be integrated in the operational SMOS Level 2 Soil Moisture algorithm and used in future inversions of the L-MEB model, for soil moisture retrievals over heterogeneous, partly forested areas. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
01962892
Volume :
46
Issue :
3
Database :
Academic Search Index
Journal :
IEEE Transactions on Geoscience & Remote Sensing
Publication Type :
Academic Journal
Accession number :
32830566
Full Text :
https://doi.org/10.1109/TGRS.2007.914801