Trmm Is The Observation Of The 9914 Typhoon Precipitation Analysis

Three Dimensional structure of rainfall rate and the response of visible/infrared, microwave brightness temperature (or radiance) to precipitation distribution and intensity during Typhoon Dan's life period are studied based on the data from TRMM PR, TMI and VIRS.Firstly, rainfall rate structure in horizontal and vertical of Typhoon Dan's precipitation cloud system at 3 different times during its life period is studied based on the data from PR 2A25 data. Results show that stratiform rain occupies more area and contributes more rainfall to the total than convective rain does at the 3 times. The average rainfall rate of stratiform rain and convective rain has a considerable increase with the intensification of typhoon. In vertical structure, the profiles of convective rain and stratiform rain are obviously different while the profiles of their own rain type among the 3 times have little difference. The profile of convective rain can be separated into three sects according to the slope, the rainfall rate decreases with the altitude and the highest deceleration is at the altitude from 5 to 6km. The profile of stratiform rain can be divided into four sects, and there is a distinct bright band structure near the altitude of 4.5km.The response of visible/infrared parameters to typhoon's precipitation distribution and intensity is analyzed by using 2A25 and 1B01 data. Results show that Chl/Ch2, Ch4 TBB and BTD45 can response the precipitation distribution while there is no stable and obvious relation between precipitation intensity and the parameters.The response of microwave brightness temperature parameters to typhoon's precipitation distribution and intensity is analyzed by using 2A25 and 1B11 data. Results show: The polarized difference of brightness temperature (PD10 PD19, PD37) only response well to precipitation distribution over ocean while they are little sensitive to the precipitation intensity. The vertically polarized brightness temperature difference between frequencies (Tbi9v-37v Tb19v-85v Tb37v-85v) response very well to both precipitation distribution and precipitation intensity. Positive difference responses precipitation and increases with the increasing rainfall rate. Polarizationcorrected temperature (PCT37, PCT85) also response very well to both precipitation distribution and precipitation intensity, and decrease with the increasing rainfall rate.