臺灣區域豪雨觀測與預報實驗後續研究-劇烈中尺度對流降雨系統之動力結構與雲物理特性雙偏極化雷達觀測分析(總計畫及子計畫二)

This proposed project intends to utilized the observational data collected fromTAHOPE to investigate the precipitation mechanism. The dual-polarization radarplays an important role in understanding the characteristics of the kinematic andmicrophysical fields of the severe precipitation systems. The spatiotemporaldistributions of the kinematic and microphysical fields can be derived from thedual-polarization measurements of: radial velocity, differential reflectivity (ZDR),differential phase shift (PHIDP), specific differential phase shift (KDP) andcorrelation coefficient (RHV) via the variational-based multiple-Doppler radarsynthesis method (WISSDOM, Liou et al. 2009) and PID fuzzy logic method.Moreover, the drop size distribution (DSD) of rain can also be retrieved from dualpolarization radar as well. The newly developed storm tracking technique, StormMotion Analysis by Radar Tracking (SMART), can be applied the TAHOPE data.Therefore, the evolutions and the structural characteristics of initiating,developing and dissipating stage of the precipitation systems can be investigated.The WRF model with sophisticated microphysical parameterization scheme andthe dual-polarization moment forward operators will be applied to selected heavyprecipitation event during TAHOPE. The sensitivity test of various microphysicalschemes will be further investigated and validated against the kinematic andmicrophysical retrieval from radar observations in the following project.In this three-year project,First year, post proposing the disdrometer and radar data collected fromTAHOPE will be the main task. The retrieval products (including wind fields, DSDand PID, etc) will be obtained consequently. Moreover, the DSD observationfrom disdrometer network will be further investigated as well. The analysis tools and concept model will be developed in this year.Second year, selected heavy precipitation case will be investigated using variousproducts from 1st year. The evolution of the heavy precipitation will beinvestigated using SMART algorithm.Third year, continuing the work from 2nd year and extending the case numbers.Also including the WRF simulation to further understanding the precipitationmechanism.