子計畫：頻段雙偏極化雷達定量降水估計產品整合研究(I)(II)

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Title:	子計畫：頻段雙偏極化雷達定量降水估計產品整合研究(I)(II) The Study of Implementing the High Spatiotemporal Resolution Qpe Product from Composited Dual-Polarimetric Radar Measurements
Authors:	張偉裕
Contributors:	大氣科學系
Keywords:	雙偏極化雷達定量降水估計 dual-polarimetric radar quantitative precipitation estimation
Date:	2017-2019
Issue Date:	2019-01-16 09:42:55 (UTC+8)
Abstract:	根據過去許多台灣的研究指出，各類波段（包含Ｓ、Ｃ及Ｘ公分波段）的雙偏極化雷達，均已顯示能提升雷達定量降水估計的準確性，同時利用雙偏極化雷達及雨滴譜儀，進行雨滴粒徑分佈的估測，是能提升雷達定量降水估計準確性的主要原因。在二至三年後，台灣將建置由Ｃ波段雙偏極化雷達為主的定量降水估計雷達網，此雷達網將搭配氣象局現有的Ｓ波段都卜勒雷達（七股、墾丁、花蓮）及目前唯一的Ｓ波段波段雙偏極化雷達（五分山），針對台灣複雜地形，提供準確的定量降水估計產品，以提供作業及研究單位使用。依據106 年度科技部自然司防災科技學門專題研究計畫課題重點說明(氣象領域，學門代碼：M1710)之研究課題1-2(即時與極短期暴雨強風預報技術之建立與應用)，本三年期計畫將分三階段研究如下：一：建立通用雷達品質管制方法及程序，以去除非氣象回波的干擾。二：以中央大學Ｃ波段及五分山Ｓ波段雙偏極化雷達資料，測試第一階段建立的通用雷達品質管制程序。三：測試通用雷達品質管制程序對雷達定量降水產品的影響。 Several previous studies of using various dual-polarimetric radars with different wavelengthes (i.e., S, C and X-band) in Taiwan have shown the pronounced improvement of the accuracy of the quantitative precipitation estimation (QPE). The utilizing of the dual-polarimetric radar and the disdrometer data (i.e., drop size distribution) simultaneously is the main reason. In the coming few years, a new C-band QPE dual-polarimetric radar network will be constructed and cooperated with S-band network. The study and implementation of the composited QPE product from S- and C-band radars is proposed in this three-year project. The project contains three parts, (1) developing the unified quality-control (QC) procedures for various radars (e.g., non-meteorological signal removal, multiple radar composition over complex terrain, etc.), (2) investigating and evaluating the unified quality-control (QC) procedures by applying to NCU CPOL and RCWF SPOL.(3) investigating the performance of radar-based QPE before and after applying unified quality-control (QC) procedures.
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