Abstract
Gamma model parameters using 2nd, 3rd and 4th moments are calculated from the drop size data of Singapore. The gamma model is simplifled into two parameter model by flnding a relation between the shape and slope parameters, and ⁄. Due to the poor correlation found between and ⁄, the drop size data is flltered based on their rain rates before a good correlation between the two parameters can be found. The -⁄ relations are then fltted for the difierent ranges of rain rate flltering. Scatter plots of and ⁄ are plotted with constant median volume diameter (D0) lines. The -⁄ relations for the difierent rain types for the tropical island of Singapore are proposed and compared with the -⁄ relations from three other countries of difierent climatic zones. T-Matrix calculations are performed to flnd the polarimetric variables at S-band by using the gamma DSD calculated from the Singapore's drop size data. The calculated difierential re∞ectivity and horizontal re∞ectivity are used along with the best -⁄ relations to flnd the gamma model parameters. The retrieved rain rate using polarimetric variables is compared with the distrometer's measured rain rate. Results show a good agreement between the retrieved rain rate and the measured rain rate. Therefore, the proposed shape slope relationship is found to be suitable for rain rate retrieval.
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