2008 年 52 巻 p. 13-18
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 4kg/m2. 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).
