The precipitation efficiency in subtropical region revealed by dual-polarimetric

The precipitation efficiencies (PE) defined by the ratio of rainfall and water vapor flux are studied by using dual-polarimetric and sounding data with retrieved 3D wind field collected in a subtropical environment during TiMREX(Terrain-influenced Monsoon Rainfall Experiment). The PE is divided into Cloud Microphysical Precipitation Efficiency (CMPE: ratio between rainfall and water content production including rain, grapel, snow and ice) and Large Scale Precipitation Efficiency (LSPE: ratio between rainfall and cloud base water vapor flux). The preliminary result is calculated from one Mei-Yu case from TiMREX. The hourly averaged CMPEs for convective and stratiform system are about 110 and 85 %. The hourly averaged LSPEs for convective and stratiform are about 95 and 28 %. In general, the CMPE is more efficient than LSPE. Moreover, the PE is higher in convective precipitation compared with in stratiform precipitation. The correlation between PE and mass-weighted diameter is about 0.65, the correlation suggests that the bigger drop associated with less evaporation rate has higher PE.