An estimation of brightness temperature for vegetated surface using SMEX02 data

Many soil moisture retrieval approaches treat vegetation simply as a uniform layer without considering its multiple scattering effects, which is valid under lower frequencies. In this paper, a brightness temperature model with wider frequencies range is proposed for AMSR-E, in order to improve the accuracy of soil moisture retrieval. The multiscattering inside vegetation and that between the vegetation and surface boundary is accounted for by matrix doubling method, the emission front surface is obtained by IEM. Preliminary simulation of crop from L to Ku band seems to be reasonable, and good agreements are achieved by comparison simulation results with PALS data at L-band in SMEX02 for soybean, and earlier PSR data at C-band for corn. In addition AMSR-E data at X and Ku-band for wheat also indicate good agreements