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研究生: 李智傑
論文名稱: 西北太平洋颱風動力降尺度模擬及其氣候變遷推估
dynamical downscaling of tropical cyclone activity and their future projection using the IPRC regional climate model
指導教授: 陳正達
學位類別: 碩士
Master
系所名稱: 地球科學系
Department of Earth Sciences
論文出版年: 2013
畢業學年度: 101
語文別: 中文
論文頁數: 76
中文關鍵詞: 熱帶氣旋降尺度模擬氣候變遷
論文種類: 學術論文
相關次數: 點閱:141下載:19
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  •   對於西北太平洋地區而言,熱帶氣旋是極具威脅性的天氣系統,常造成財物損失及危害生命安全;因此,增進對於熱帶氣旋的研究是非常重要的。近年來,關於全球暖化的議題,也逐漸受到重視。
      而過去的研究大多提升模式內的二氧化碳濃度來模擬暖化的環境,在本次研究中則是利用Coupled Model Intercomparison Project Phase 5(CMIP5)的氣候模式資料作為初始場,並透過International Pacific Research Center的regional climate model作降尺度模擬。首先,會利用歐洲中長期預報中心所提供之30年再分析資料進行模式評估。結果顯示,模式有將環境場再現的能力,且熱帶氣旋的個數及生成位置都能有與觀測相似的結果。
      接著,透過Root mean square error挑選出CMIP5中與實際觀測較相似的NCAR Community Climate System Model version 4 (CCSM4)模式結果對於兩組情境進行降尺度模擬,藉此比較出氣候變遷的差異。環境暖化的情境下,大氣底層顯著的增溫造成季節環流的改變,也使得雨量趨於集中在熱帶對流區。在未來熱帶氣旋雖然主要的生成位置變化不大;但在主要生成月7-10月平均生成個數則有顯著增加。在暖化情境下,熱帶氣旋數量上有增加的趨勢,而最大強度在20 m/s以下的熱帶氣旋數量上變化不大,但其他強度的熱帶氣旋數量上都有明顯增加的情形。由於高強度的熱帶氣旋增加,也使得熱帶氣旋所能挾帶的水氣增加,造成在未來熱帶氣旋所伴隨的雨勢也會有所增強。

    致謝 I 中文摘要 II 圖目錄 IV 第一章 前言 1 1.1 文獻回顧 1 1.2 熱帶氣旋活動與模擬預報 2 1.3 研究動機與目的 5 第二章 研究方法與資料 6 2.1模式介紹 6 2.2使用資料 9 2.3 模式實驗設計 11 2.4模式熱帶氣旋判斷 12 第三章 模式模擬結果評估 14 3.1模式與實際觀測氣候場之比較 14 3.2 模式熱帶氣旋之結構 15 3.3 模式熱帶氣旋之氣候分析 16 3.4 模式熱帶氣旋年際變化 18 3.5 熱帶氣旋的季節變化 21 3.6 IPRC模式熱帶氣旋對於ENSO的表現 22 3.7 IPRC模式熱帶氣旋對於東印度洋海溫的表現 24 第四章 氣候變遷影響下的氣旋活動 26 4.1 CCSM4資料比較 26 4.2 環境場的改變 26 4.3 熱帶氣旋變化之氣候分析 28 第五章 討論與結論 32 參考文獻 35 附圖 41 附表 76

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