Abstract:
From November 2006 to June 2007 a field experiment ‘Tanashi Experiment’ was conducted in a farm
of the University of Tokyo, Japan. The scientific objectives are presented in this paper and the
corresponding experiment set-up is described. The influences of soil moisture and vegetation layer on the
brightness of various frequencies are analyzed. The sensitivity of higher frequencies on the soil moisture
changing is identified. The TB of all frequencies and polarization is found to be saturated and reach same
values when vegetation water content larger than 4 kg/m
. A Land Data Assimilation System developed
by the University of Tokyo (LDAS-UT) is validated by using data obtained from this experiment. And
one important merit of LDAS-UT, parameter optimization, is verified through the comparison of
optimized parameters with the in situ observed ones. The difference between the optimized parameters
and the observed ‘real’ ones reveals the potential source of uncertainty in the system due to the limitation
of current Radiative Transfer Model (RTM) and Land Surface Scheme (LSS).
