2020-03-102024-05-14https://scholars.lib.ntu.edu.tw/handle/123456789/660898摘要：中央氣象局自2014年起升級五分山S波段都卜勒天氣雷達具雙極化(dual- polarization)功能，新建之C波段雙偏極化防災降雨雷達，亦陸續於2017年起投入運作。前期計畫已篩選北台灣大雨事件為五分山S與C波段雙偏極化雷達分析個案之基礎。研究結果顯示融解層以上的偏極化雷達參數ZDR和KDP大值在地面強降雨前就出現，可能發展為暴雨發生之即時預報指標。而KDP衰減訂正法能有效修正C波段雷達在回波和ZDR的衰減。本期計畫將深化去年度工作成果，包括增加強降雨個案分析數量，強化雷達與地面雨滴譜儀的關聯性。並將深入討論RCWF和RCMD在不同天氣條件下的觀測特徵，以及對於觀測應用之影響（特別是與雲物理過程有關的水象粒子分類法）。計劃成果將有效應用於環島之雷達網，精進定量降雨估計與預報效能。<br> Abstract: CWB had upgraded RCWF S-band Doppler weather radar with dual-polarization function since 2014. The newly-built C-band dual-polarization radar network has also been operated since 2017.Last year (2019), this project has screened the northern Taiwan heavy rain event as the basis for the analysis of the RCWF and RCMD dual-pol radar. The results show that the large values of ZDR and KDP above the melting layer appear before the heavy rainfall on the ground, and may develop into a nowcasting indicator of the occurrence of heavy rain. Using of KDP can effectively correct the attenuation of the C-band radar in the reflectivity and ZDR.This project will deepen the study of last year, including increasing the number of heavy rainfall case analysis and strengthening the correlation between radar and ground disdrometer. The observational characteristics of RCWF and RCMD under different weather conditions and their impact on observational applications (especially the hydrometeor classification method related to cloud physical processes) will be discussed in detail. The results of this project will be effectively applied to the radar network around the Taiwan island to improve quantitative rainfall estimation and forecasting.偏極化雷達定量降雨估計水象粒子polarimetric radarquantitative precipitation estimationhydrometror classification