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研究生:莊惟然
研究生(外文):Wen-Jan Chuang
論文名稱:颱風形成期間環境信風場之變化與影響
指導教授:李清勝李清勝引用關係
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:大氣科學研究所
學門:自然科學學門
學類:大氣科學學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:中文
論文頁數:111
中文關鍵詞:渦流角動量通量信風增強熱帶氣旋熱帶氣旋形成
外文關鍵詞:
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觀測資料顯示部分熱帶氣旋形成前,擾動北方低層信風有顯著增強現象(Lee,1986);此類個案大都發生於秋冬季,且伴隨顯著低層渦度平流和渦流角動量通量(Lee and Lee,2002;黃,2001)。本研究之目的在分析此類型個案中信風增強之過程,並探討強信風所扮演之角色。根據JTWC最佳路徑資料顯示,在1986~2000年間,共有400個熱帶氣旋形成;利用EC資料所做的分析顯示,有21個個案伴隨顯著信風增強。此類個案集中在10~12月,其形成位置較氣候平均位置偏東南。結果同時顯示,有16個個案之低層環境流場特徵非常相似,即信風的增強和擾動中心北方分裂高壓之東移有關。
為探討強東風在熱帶氣旋形成過程中所扮演之角色,本研究針對黃(2001)所模擬之Manny颱風(1993),進行相同之控制組數值實驗,並減弱擾動中心北方東風以進行對照組實驗;此外,並針對Lola(1993)進行相同實驗。結果顯示,兩個個案之控制組實驗中,擾動中心渦度從積分初期便開始增強,約於積分36小時後形成熱帶低壓,且隨時間有繼續增強趨勢。而減弱擾動中心北方東風之對照組實驗中,初期擾動雖有增強趨勢,但積分24~36小時後,擾動即不再增強甚或開始減弱,與控制組之差異越來越顯著。
分析模擬結果顯示,在控制組實驗中,伴隨強信風的強渦度場,透過水平渦度平流效應,能有效持續增強擾動中心渦度。就另一角度而言,渦流角動量通量隨積分逐漸增加,能有效提供系統旋轉加速。然而,在對照組實驗中,水平渦度平流無法持續維持擾動中心渦度之增強,且渦流角動量通量隨積分時間逐漸減弱。因此,環境強東風在擾動發展成熱帶氣旋過程中,確實扮演著關鍵角色。
第一章 前言………………………………………………..…….….1
1-1 論文回顧—熱帶氣旋形成之研究………….………….….1
1-2 研究動機…………………………………….…..…………6
第二章 伴隨信風增強形成熱帶氣旋之診斷分析….…….………..8
2-1 信風增強個案之選取………………….…………..………8
2-2 信風增強個案之特性……………………..……...………10
2-3 典型高壓個案之低層環境特徵………………..….……..10
2-4 典型高壓個案之合成分析…………………..…….……..11
2-5 統計分析結果………………………………………...…..13
第三章 強信風影響熱帶氣旋形成之模擬與分析………….…….15
3-1 模擬個案簡介……………..……………………………....16
3-1.1 Manny(1993)……………………………………………..16
3-1.2 Lola(1993)………………………………………………..17
3-2 控制組模擬結果……………………………………….…17
3-2.1 Manny(1993)模擬結果…………………………………..17
3-2.2 Lola(1993)模擬結果……………………………………..19
3-3 東風強弱影響熱帶氣旋形成之敏感度測試…………….21
3-3.1 Manny(1993)控制組與對照組模擬結果比較…………..23
3-3.2 Lola(1993)控制組與對照組模擬結果比較……………..26
3-4 敏感度測試結果討論…………………………………….27
3-4.1 控制組與對照組渦度收支之比較……………………….27
3-4.2 控制組與對照組絕對角動量通量之比較……...….…….29
第四章 討論與總結……………………..………….……………..33
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