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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳泰然 | |
| dc.contributor.author | Sau-Wa Chang | en |
| dc.contributor.author | 曾秀樺 | zh_TW |
| dc.date.accessioned | 2021-06-13T07:13:27Z | - |
| dc.date.available | 2005-07-29 | |
| dc.date.copyright | 2005-07-29 | |
| dc.date.issued | 2005 | |
| dc.date.submitted | 2005-07-26 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/35848 | - |
| dc.description.abstract | 2003年6月6∼7日華南與台灣地區受梅雨鋒面影響，衛星雲圖顯示中尺度對流系統（MCSs）於鋒面及其南側持續發展，且水平覆蓋範圍廣泛。伴隨對流發展，850 hPa鋒面區之相對渦度相對增強， MCSs南側亦有LLJ形成並隨時間增強。隨後MCSs持續發展並東移影響台灣地區，造成中、南部豪（大）雨。本文主要目的為探討此個案梅雨鋒面上持續發展之MCSs與鋒面強度維持和其南側LLJ形成與增強之機制。
綜觀分析顯示，個案期間除了低層鋒面系統外，並無其他明顯高層槽脊系統或噴流位於台灣及華南地區，顯然鋒面為主要造成台灣中、南部地區豪（大）雨之環流系統。本個案中梅雨鋒面結構為垂直近乎不傾斜的淺系統，鋒面水平溫度梯度微弱，具有強水平氣旋式風切及顯著之水氣梯度，中對流層並有暖心存在，與Chen and Chang（1980）分析個案中之西段鋒面結構相似。 有關本個案鋒面強度之維持與發展，本文利用逐段位渦反演診斷鋒面上相對渦度之增強，發現主要來自於中低層與潛熱釋放有關之位渦擾動所貢獻。另外，從渦度收支之分析結果亦得知，低層輻合為鋒面上渦度維持之主要過程。本個案雖發生於25°N以南之區域，但由於對流系統水平尺度夠大且發展時間持久，使對流潛熱釋放能有效加熱大氣，透過非線性CISK過程，導致鋒面上相對渦度由8 × 10-5 s-1增強至16 × 10-5 s-1。顯然對流潛熱釋放與輻合過程對梅雨鋒面的發展與維持，均扮演重要的角色。 此外，由逐段位渦反演之結果顯示，與中低層潛熱釋放有關之位渦擾動引發氣旋式環流，增強MCSs南側局部風場而形成 LLJ。就調整觀點而言，MCSs潛熱釋放造成局部氣壓梯度增強，因而增強地轉風；同時，潛熱釋放亦有利低層輻合之增強，產生非地轉風，再透過科氏加速增強西南風並疊加於地轉風上，使LLJ形成與發展。 | zh_TW |
| dc.description.provenance | Made available in DSpace on 2021-06-13T07:13:27Z (GMT). No. of bitstreams: 1 ntu-94-R92229013-1.pdf: 6577875 bytes, checksum: 8d598e62bcc650501d3dda7240301fd3 (MD5) Previous issue date: 2005 | en |
| dc.description.tableofcontents | 目 錄--------------------- I
摘 要--------------------- III 圖 說--------------------- IV 第一章 前言--------------- 1 第二章 資料來源與分析方法- 6 一、資料來源--------------- 6 二、分析方法--------------- 6 第三章 綜觀天氣形勢------- 12 一、地面分析--------------- 12 二、高空分析--------------- 13 三、衛星雲圖分析----------- 14 四、小結------------------- 15 第四章 梅雨鋒面結構------- 17 一、水平結構--------------- 17 二、垂直結構--------------- 20 三、小結------------------- 22 第五章 鋒面強度維持機制--- 24 一、逐段位渦反演----------- 24 二、渦度收支--------------- 26 三、小結------------------- 28 第六章 LLJ形成與增強機制-- 30 一、MCSS 與LLJ------------- 30 二、逐段位渦反演----------- 31 三、非地轉風分析----------- 33 四、小結------------------- 34 第七章 討論--------------- 35 第八章 總結--------------- 40 誌 謝--------------------- 42 參考文獻------------------- 43 圖-------------------------47 | |
| dc.language.iso | zh-TW | |
| dc.title | 梅雨鋒面個案之診斷分析 | zh_TW |
| dc.type | Thesis | |
| dc.date.schoolyear | 93-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 李清勝,周仲島,林松錦,王重傑 | |
| dc.subject.keyword | 梅雨鋒面,位渦擾動,低層噴流,潛熱釋放,非線性第二類條件不穩度, | zh_TW |
| dc.subject.keyword | Meiyu front,potential vorticity anomaly,low-level jet,conditional instability of the second kind (CISK), | en |
| dc.relation.page | 81 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2005-07-26 | |
| 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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