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研究生: 陳思婷
Szu-Ting Chen
論文名稱: 求解雷達資料反演熱動力場未知常數之新方法的發展及驗證
The verification of a new method for solving the unknown constants in the retrieved thermodynamic field using multiple radar data
指導教授: 廖宇慶
Yu-Chieng Liou
口試委員:
學位類別: 碩士
Master
系所名稱: 地球科學學院 - 大氣科學學系
Department of Atmospheric Sciences
論文出版年: 2023
畢業學年度: 112
語文別: 中文
論文頁數: 73
中文關鍵詞: 都卜勒雷達風場合成熱動力反演
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  • 本研究採用一新發展的方法,嘗試解決一個自1987年即存在於熱動力反演演算法中的問題,也就是用都卜勒雷達合成風場所反演出來的熱動力場(即: 溫度及氣壓的擾動場),在垂直結構上的不確定性。這個不確定性來自於傳統方法上的限制: 也就是反演的熱動力場在每個水平面上與真實值都相差一個未知常數,這個未知常數以擾動場的水平平均的形式存在。本研究所用的新方法,其優勢在於首創藉由結合狀態方程和垂直方向動量方程式,可由一個單點的地面站觀測開始垂直積分,獲得該未知常數的垂直分布,而非如前人研究所採用的,必須仰賴時間解析度極低的探空氣球資料。
    本研究使用Observing System Simulation Experiment(OSSE)的架構,測試此方法的可行性,並進一步應用於2008年西南氣流實驗#IOP 8的真實個案。首先使用都卜勒雷達觀測的徑向風進行風場合成,並利用此三維風場資訊反演熱動力場,再使用新方法校正熱動力場垂直結構。結果顯示,以新方法得之水平平均相似於探空觀測得之,並且成功校正其垂直結構,證實了此方法在分析劇烈天氣的情形下有一定的可信度。


    This study adopts a newly developed method in solving the vertical structure uncertainty of retrieved thermodynamic fields (e.g., pressure and temperature perturbations) from multiple-Doppler radars synthesized winds, which hadn’t been solved yet since 1987. This uncertainty comes from the limitation of the traditional method: an unknown constant exists at each layer. This unknown constant exists with a form of horizontal average. The advantages of this new method is that the vertical uncertainty can be solved by a single in-situ observation only by combining the Equation of State and vertical integration instead of relying a sounding observation with much lower temporal resolution.

    We conduct OSSE framework at first and the data collected during SoWMEX (Southwestern Monsoon Experiment) IOP #8 , which is a heavy rainfall event occurred on June 14 2008, are further investigated the performance of the new scheme. In this study, using the data from Doppler radar, WISSDOM(WInd Synthesis System using DOppler radar Measurements) helps to provide the wind information and a thermodynamic retrieval is conducted by TPTRS(Terrain Permitting Thermodynamic Retrieval Scheme). The horizontal average of each layer can be obtained either by the sounding or the station. The results show that the horizontal averages of thermodynamic fields obtained from the stations are quite similar to which obtained from the soundings. The vertical structure has been correctly solved. Overall, it demonstrates a high reliability using the new scheme.

    摘要 i Abstract ii 誌謝 iii 目錄 iv 表目錄 vi 圖目錄 vii 第一章 緒論 1 1.1 前言 1 1.2 文獻回顧 2 1.3 論文架構 3 第二章 風場反演與熱動力反演法 4 2.1 多都卜勒雷達風場合成 4 2.1.1 價值函數 4 2.1.2 沈浸邊界法 7 2.2 熱動力場反演 8 第三章 垂直方向未知常數之處理 11 第四章 觀測系統模擬實驗 14 4.1 定量校驗方法 14 4.2 實驗設計 15 4.3 敏感度測試 15 4.3.1 門檻值 15 4.3.2 垂直距離 16 4.4 結果分析 17 第五章 真實個案分析與反演結果 18 5.1 SOWMEX IOP #8 個案介紹 18 5.2 反演設定與使用資料 18 5.2.1 反演設定 18 5.2.2 七股雷達(RCCG) 19 5.2.3 SPOL雷達(SPOL) 19 5.2.4 墾丁雷達(RCKT) 19 5.2.5 雷達資料品質控管與處理 20 5.2.6 探空觀測資料 20 5.2.7 測站觀測資料 20 5.3 風場合成背景場製作 21 5.4 反演風場及驗證 21 5.4.1 定量校驗 21 5.4.2 風場合成結果 22 5.5 熱動力反演場 23 第六章 結語與展望 25 6.1 結語 25 6.2 未來展望 26 參考文獻 27 附錄 30 附表 32 附圖 33

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