臺灣博碩士論文加值系統

過去的研究顯示，機載雷達所觀測的2008年哈格比颱風，其主雨帶具有較不一樣的結構特徵。為了對其有進一步的了解，本研究利用CReSS模式對本個案進行模擬，重現哈格比颱風雨帶的結構與演變，並探討其生成的機制。模擬的結果顯示，主雨帶的風場結構同時具有內、外雨帶的特徵；對流結構與外雨帶相似，向上向內傾斜，層狀降水區域則發生在雨帶內側。雨帶在徑向的移動上，於生成初期，並沒有明顯的移動；雨帶發展成熟後，則明顯向外移動，速度為4.72~6.1 m⋅s-1。
本研究個案的三個雨帶，具有類似的生成機制。舊有內雨帶外側的下沉氣流，使得空氣於近地表處堆積，造成近地表水平輻散。雨帶和其外側輻散區隨著時間相對於颱風中心向外（東）移動的過程中，氣流向外加速，並且輻散區的前緣亦使得氣流向外加速。向外加速的風場與環境氣流產生合流，進一步產生輻合，並激發出雨帶。由於雨帶走向主要為切向方向，本研究從圓柱座標的徑向運動方程，討論各作用力對於徑向風速加速的貢獻，結果顯示，不論擾動氣壓梯度力，離心力和科氏力，皆在雨帶生成之前，對於徑向風的加速產生正的貢獻。綜合以上顯示，雨帶之間的交互作用是影響雨帶發展的重要因素之一。

致謝 Ⅰ
摘要 Ⅱ
目錄 Ⅲ
圖表目錄 V

第一章 前言 1
1.1 文獻回顧 1
1.2 研究動機 5
1.3 論文架構 7

第二章 資料來源與研究方法 8
2.1資料來源 8
2.2研究方法 9
2.3模式簡介 12
2.4 模式設定 17

第三章 個案簡介 18
3.1哈格比颱風簡介 18
3.2哈格比颱風的主雨帶 19

第四章 模擬結果 22
4.1颱風路徑與風速 22
4.2颱風雨帶發展 23

第五章 雨帶的分析 27
5.1雨帶簡介 27
5.2雨帶的徑向移動 28
5.3雨帶的垂直結構 30
5.4雨帶的底層輻合輻散 32

第六章 雨帶的生成 33
6.1雨帶的生成機制 33
6.2西風加速與作用力的關係 42

第七章 結論 53

參考文獻 56

圖表 61

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