Development of synthetic GPM/DPR data using KaPR sampling experiment of the TRMM/PR

We have developed the GPM/DPR synthetic data from the TRMM/PR data for contribution to higher level algorithm development. The frequency of the PR is 13.8 GHz and it is necessary to estimate radar reflectivity factor (Z-factor) at the DPR frequencies. In this paper, Z-factors from rainfall signals are estimated at the DPR frequencies. The detectable rain range of the DPR is verified using the synthetic data from the PR observations on January and July 1998, which suggests that it is important to consider differences of the sensitivity between the KuPR-matched beams and the interlaced high-sensitivity beams of the KaPR. The estimation of the Z-factors at the DPR frequencies is applied to an experimental data on 15th March 2007 when the PR was operated according to the scanning geometry of the KaPR, and then the synthetic data are obtained with distinction of 2 kinds of KaPR beams.