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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 隋中興 | |
dc.contributor.author | Ching-Hsuan Wu | en |
dc.contributor.author | 吳靜軒 | zh_TW |
dc.date.accessioned | 2021-05-15T17:59:05Z | - |
dc.date.available | 2014-03-09 | |
dc.date.available | 2021-05-15T17:59:05Z | - |
dc.date.copyright | 2014-03-09 | |
dc.date.issued | 2014 | |
dc.date.submitted | 2014-02-12 | |
dc.identifier.citation | Aiyyer, A., A. Mekonnen, and C. J. Schreck, 2012: Projection of tropical cyclones on wavenumber-frequency-filtered equatorial waves. J. Climate, 25, 3653−3658.
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/5445 | - |
dc.description.abstract | 本研究目的在探討西北太平洋(WNP)大尺度背景場對熱帶天氣尺度擾動(以下簡稱擾動)發展成熱帶氣旋(TC)的影響。利用歐洲中期天氣預報中心(ECMWF)提供的ERA-Interim再分析資料與美國海洋暨大氣總署(NOAA)提供的外逸長波輻射(OLR)資料,透過3-8天時間濾波找出2000年至2009年暖季(五月至九月)熱帶擾動,以其中165個獲得命名的擾動(TCd)與314個未能獲得命名的擾動(TCn)做為對照,探討熱帶大尺度背景場對於熱帶氣旋生成機率[PTcG =TCd /(TCd+ TCn)]的影響。後者包括ENSO、Madden-Julian oscillation (MJO)、n=1赤道羅士比(ER)波。利用海洋聖嬰指數(Oceanic Nino Index, ONI)定義年際變化。使用Wheeler and Kiladis (1999)的波數-頻率波譜分析法,找出熱帶地區MJO、ER波訊號。
我們探討PTcG在年際至季內的低頻背景場(主要為ENSO和MJO)的變化,發現在暖年、正常年、冷年與MJO對流活躍、不活躍相位的六種組合背景下,總擾動數量(TCd+TCn)是大致不變的(每100天的數量約為31個);當低頻背景場由不利趨向有利時,TCd變多而TCn變少,導致PTcG增加(23%至44%)。至於擾動在ER背景場的變化,由負到正渦度場,TCd與TCn都變多,但PTcG 也增加(23%至41%)。若將低頻背景場與ER渦度場合併考量,ER正(負)渦度值會進一步提高(降低)各低頻背景場的PTcG;比較TCd與TCn在ER波段與低頻(以30天滑動平均代表季內至年際變化)渦度場之間的關係,發現有109個TCd和110個TCn發生於低頻場與ER渦度皆為正值的背景,PTcG為50%,較氣候平均值明顯提高;相對於低頻場與ER渦度皆為負值的背景,PTcG不到5%。 我們進一步針對ER進行合成分析,探討ER結構與熱帶氣旋生成(tropical cyclone genesis, TCG) 間的可能關聯。結果顯示不論TCd或TCn,ER的波長皆為6000-7000公里(波數六至七),水平結構為東北-西南傾斜,垂直結構向西傾斜且為第一斜壓模結構。以位於ER正渦度之TCd中心合成的ER結構具有強對流耦合特性;而位於ER正渦度之TCn合成結果也有類似但較弱的ER結構。以位於ER負渦度之TCd中心的合成結果顯示,TCd處於ER反氣旋式環流西側的南風區,ER本身呈現低層輻合區落後正渦度區、較接近線性理論結構;位於ER負渦度之TCn的合成結果則在反氣旋式環流內,對流微弱、ER垂直結構為低層輻散、高層輻合,是非常不利擾動持續發展的環境。ER與擾動之間的相互作用還需要進一步的分析與討論。 | zh_TW |
dc.description.provenance | Made available in DSpace on 2021-05-15T17:59:05Z (GMT). No. of bitstreams: 1 ntu-103-R00229015-1.pdf: 5448452 bytes, checksum: 6bcfc34d557d98aa015d1aabb7886ca3 (MD5) Previous issue date: 2014 | en |
dc.description.tableofcontents | 口試委員審定書....................................i
致謝.............................................ii 中文摘要........................................iii Abstract..........................................v 目錄............................................vii 表目錄...........................................ix 圖目錄............................................x 第一章 前言.......................................1 第二章 使用資料與研究方法.........................5 2.1 使用資料......................................5 2.2 MJO相位之定義.................................6 2.3 有發展及未發展熱帶擾動之定....................7 第三章 熱帶背景場與擾動之統計關係.................8 3.1 擾動在低頻場與ER 渦度之分布特徵...............8 3.2 年際變化與MJO 對熱帶氣旋生成的影響............8 第四章 從擾動中心合成 ER 結構....................12 4.1 位於ER 正渦度的TCd...........................12 4.2 位於ER 正渦度的TCn...........................13 4.3 位於ER 負渦度的TCd...........................13 4.4 位於ER 負渦度的TCn...........................14 4.5 合成ER 的主要特徵............................15 第五章 結論......................................16 參考文獻.........................................19 表...............................................24 圖...............................................27 | |
dc.language.iso | zh-TW | |
dc.title | 西北太平洋背景場對熱帶氣旋生成影響之分析 | zh_TW |
dc.title | Tropical Multi-Scale Oscillations and Tropical Cyclone Genesis in western North Pacific | en |
dc.type | Thesis | |
dc.date.schoolyear | 102-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 吳俊傑,李清勝 | |
dc.subject.keyword | 熱帶氣旋生成,低頻背景場,赤道羅士比波,已發展擾動,未發展擾動,合成分析, | zh_TW |
dc.subject.keyword | Tropical cyclone genesis,low frequency background field,equatorial Rossby wave,developed and nondeveloped disturbances,composite analysis, | en |
dc.relation.page | 42 | |
dc.rights.note | 同意授權(全球公開) | |
dc.date.accepted | 2014-02-13 | |
dc.contributor.author-college | 理學院 | zh_TW |
dc.contributor.author-dept | 大氣科學研究所 | zh_TW |
顯示於系所單位: | 大氣科學系 |
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