臺灣與周邊地區雷達遙測應用於氣象防災的技術開發、驗證與應用-多頻段高解析度雙偏極化雷達定量降水估計產品整合:溶解層回波衰減特性分析(子計畫四)(II);The Study of Implementing the High Spatiotemporal Resolution Qpe Product from Composited Multiple Frequency Dual-Polarimetric Radar Measurements: Attenuation Characterisitcs of Melting Layer

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Title:	臺灣與周邊地區雷達遙測應用於氣象防災的技術開發、驗證與應用-多頻段高解析度雙偏極化雷達定量降水估計產品整合:溶解層回波衰減特性分析(子計畫四)(II);The Study of Implementing the High Spatiotemporal Resolution Qpe Product from Composited Multiple Frequency Dual-Polarimetric Radar Measurements: Attenuation Characterisitcs of Melting Layer
Authors:	張偉裕
Contributors:	大氣科學學系
Keywords:	雙偏極化雷達;溶解層亮帶;回波衰減修正;dual-polarimetric radar;melting-level bright band;attenuation correction
Date:	2020-12-08
Issue Date:	2020-12-09 09:28:15 (UTC+8)
Publisher:	科技部
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，台灣將建置由五部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波段都卜勒雷達及雙偏極化雷達，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。然而不同波段雷達的硬體設定、周遭環境條件等差異，產生各自不同的非氣象資料干擾，在定量利用雷達資料前，須正確的分辨氣象、非氣象資料。利用自適模糊邏輯法辨識非氣象雷達資料技術，已在107年度科技部自然司防災科技學門專題研究計畫支持下完成開發。此外，因濕天線罩所造成的變動系統偏差及衰減效應，因不同雷達特性而有所不同特性，自動化的修正技術已在108年計畫支持下進行開發。本計劃將依據108 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1-3(臺灣與周邊地區雷達遙測應用於氣象防災的技術開發、驗證與應用)，發展雷達資料處理相關技術。本三年期計畫第二、三階段研究規劃如下：第二年：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,並建立多雷達整合技術，分析雷達回波在溶解層的衰減特性。第三年：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. Due to various manufacture configurations and surrounding environments, each radar has distinct error characteristics of non-meteorological signals. The removal of these non-meteorological signals is essential for quantitative applications from dual-polarimetric radar. The self-adaptive fuzzy-logic non-meteorological signals identification algorithm has been developed in previous project. Moreover, the dynamic system bias due to wet-random effect and the rain attenuation effect are crucial for further applications as well. The first of this three-year project has developed the algorithm for correcting the system bias and wet-random effect. Furthermore, investigating attenuation characteristics of melting layer is proposed in this project (second-year). The RCWF and RCMD The goals in this three-years project for second and third year are: 2nd year, evaluating the unified quality-control (QC) procedures by applying to RCMD and RCWF. Examining the attenuation characteristics of melting layer of C- and S-band radars.3rd year, investigating the performance of radar-based QPE before and after applying unified quality-control (QC) procedures.
Relation:	財團法人國家實驗研究院科技政策研究與資訊中心
Appears in Collections:	[Department of Atmospheric Sciences] Research Project

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