Using The Cloud And Radiative Transfer Model Of Convective Precipitation Cloud Microphysical And Microwave Radiation Characteristics

In this thesis a three-dimensional cloud model-microwave radiation transfer model combination is used to study the relations among the precipitation, other microphysical characteristics of a convective cloud system and the upwelling radiance at pertinent microwave frequencies. The results of the model are preliminarily compared with TRMM products.The cloud model gives a complete structure of the partical microphysics of a convective cloud system over Chinese Mainland. A comparison between microphysical characteristics derived from 3-D cloud model and the results from TRMM TMI and PR products show that the selected cloud model gives a relatively realistic hydrometeor profiles. The hydrometeor information from the cloud model is then used as input into a 3-D microwave radiation transfer model that calculates the upwelling radiance received by the rediometer aboard the satellite. The resulting brightness temperature (Tb), hydrometeor structure, and surface rainfall rate relations show that the ice hydrometeor, espatially the ice at the top of the precipitating cloud, decreases the brightness temperature significantly at 85. 5GHz by scattering radiance. The brightness temperature is highly related to the density of ice hydrometeor. Since the convective cloud system is tilted, and the viewing angle is oblique, the area displacement between ice hydrometeor and the surface rainfall rate makes the relation between Tb and surface rainfall rate is relatively small.