Abstract
The ability of the Tropical Rainfall Measuring Mission Microwave Imager (TRMM/TMI) for remote sensing of cloud liquid water (CLW) has been demonstrated in this study. Due to the great sensitivity of the TMI 85.5 GHz channels to CLW, the CLW for non-precipitating clouds over land can be successfully estimated with the measurement data of TMI 85.5 GHz channels using the Vector DIScrete Ordinate Radiative Transfer (VDISORT) model based on the iteration steps. A numerical step-by-step method is proposed for the microwave surface emissivity estimate over land with the help of VDISORT model. The brightness temperature at 85.5 GHz in vertical polarization (TB85V) of TMI was further applied for the CLW estimates over land regions during the Huaihe River Basin Energy and Water Cycle Experiment (HUBEX) in China. The retrieval results based on TRMM/TMI data show reasonable agreement with the ground-based microwave radiometer measurements. It is proved that the physical method presented in this study for the CLW retrieval over land is feasible and valid.
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