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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 隋中興(Chung-Hsiung Sui) | |
| dc.contributor.author | Po-Chun Chiang | en |
| dc.contributor.author | 江柏君 | zh_TW |
| dc.date.accessioned | 2022-11-23T09:01:26Z | - |
| dc.date.available | 2021-11-05 | |
| dc.date.available | 2022-11-23T09:01:26Z | - |
| dc.date.copyright | 2021-11-05 | |
| dc.date.issued | 2021 | |
| dc.date.submitted | 2021-10-11 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/79475 | - |
| dc.description.abstract | 本研究藉由分析第二代通用地球系統模式(Community Earth System Model Version 2)參與第六次耦合模式比對計畫(Coupled Model Intercomparison Project Phase 6)之前工業化控制組(pre-industrial control)實驗的模擬結果來探討太平洋年代際變異(Pacific decadal variability)的特徵及變異的可能機制。我們首先分析模式資料的太平洋海表面溫度和副熱帶經向環流(subtropical cells)，發現與觀測的熱帶太平洋年代際變異和海洋通道有近似的特徵。接著，我們選擇訊號清楚的主要年代際事件並進行合成分析。合成的熱帶太平洋年代際變異呈現顯著的熱帶特徵，包括在由海表面溫度暖異常所定義之暖相位下，熱帶區域(10°N-10°S)的斜溫層緯向梯度和信風強度減弱，以及太平洋副熱帶經向環流和赤道潛流(equatorial undercurrent)減緩。模擬的副熱帶年代際變異顯示冷海表溫度橫跨熱帶暖海表溫度南北兩側，與聖嬰南方振盪(El Niño-Southern Oscillation)相近。模擬結果除了有比聖嬰南方振盪更寬的經向尺度外，大致與觀測的熱帶太平洋年代際變異一致。而冷相位下的合成特徵與暖相位接近，但符號相反。另外，熱帶太平洋年代際變異展現明顯的南北不對稱，海洋隧道的特徵在南太平洋比較明顯，而北太平洋則有太平洋經向模態(Pacific meridional mode)的特徵。我們更進一步比較數個選取的指數，顯示熱帶太平洋海表面溫度的變異與暖水體積、內部副熱帶經向環流及赤道潛流的傳送呈負相關，而與熱帶風應力旋度呈正相關。這些指數都表現出相近的年代際震盪週期，約15至20年。最後，熱帶太平洋的熱收支分析指出內部的經向熱傳送與垂直熱傳送在暖相位和從暖轉冷相位時排出熱帶太平洋暖水，調控熱帶太平洋年代際變異的相位轉換，而在冷相位和從冷轉暖相位時反向也成立。對此二收支項做尺度分離，發現到皆被年代際異常流所傳送的平均溫度所主導。雖然整體的合成熱帶太平洋年代際變異在熱帶太平洋區域(~10°N-10°S)與聖嬰南方振盪相似，但熱帶太平洋年代際變異的表現比起後者的振盪性更加不規律，且熱帶太平洋年代際變異的相位轉換機制也不如聖嬰南方振盪清晰，暗示非線性熱帶動力與隨機風場強迫的重要性。 | zh_TW |
| dc.description.provenance | Made available in DSpace on 2022-11-23T09:01:26Z (GMT). No. of bitstreams: 1 U0001-0910202123500600.pdf: 7799896 bytes, checksum: 36ec9f5de8751059e6253ac20947293f (MD5) Previous issue date: 2021 | en |
| dc.description.tableofcontents | 口試委員會審定書.....................................................................i 序言...............................................................................ii 摘要................................................................................v ABSTRACT..........................................................................vii CONTENTS...........................................................................ix LIST OF FIGURES....................................................................xi LIST OF TABLES...................................................................xiii Chapter 1 Introduction..............................................................1 1.1 Motivations: Climate Change and Natural Variability...........................1 1.2 Teleconnections and Pacific Decadal Variability...............................2 1.3 Oceanic Tunnel in Pacific: Pacific Subtropical Cells..........................4 1.4 Pacific Subtropical Cells and Tropical Pacific Decadal Variability............5 1.5 Objectives of the Study.......................................................7 Chapter 2 Data......................................................................9 Chapter 3 Decadal Variability of Sea Surface Temperature in Pacific................11 3.1 Global Sea Surface Temperature Pattern.......................................11 3.2 Pacific Decadal Variability..................................................11 Chapter 4 Features of Pacific Subtropical Cells....................................14 4.1 Characteristics of Pacific Subtropical Cells.................................14 4.2 Characteristics of Pacific Equatorial Undercurrent...........................16 4.3 Statistics of Pacific Subtropical Cells......................................17 Chapter 5 Spatiotemporal Structures of Tropical Pacific Decadal Variability........20 5.1 Signals of Tropical Pacific Decadal Variability..............................20 5.2 Spatial Features of Tropical Pacific Decadal Variability.....................21 5.3 Temporal Features of Tropical Pacific Decadal Variability....................25 Chapter 6 Heat Budget Analysis of Tropical Pacific Decadal Variability.............29 6.1 Heat Budget..................................................................29 6.2 Scale Separation.............................................................32 Chapter 7 Summary..................................................................34 Chapter 8 Discussion...............................................................38 REFERENCE..........................................................................42 FIGURES............................................................................47 TABLES.............................................................................84 APPENDIX...........................................................................87 | |
| dc.language.iso | en | |
| dc.title | 利用海氣耦合模式探討太平洋年代際變異 | zh_TW |
| dc.title | Simulated Pacific Decadal Variability in an Ocean-Atmosphere Coupled Model | en |
| dc.date.schoolyear | 109-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 曾于恒(Hsin-Tsai Liu),黃彥婷(Chih-Yang Tseng) | |
| dc.subject.keyword | 太平洋年代際變異,太平洋年代際振盪,熱帶太平洋年代際變異,遙相關,海洋隧道,太平洋副熱帶經向環流,通用地球系統模式,第六次耦合模式比對計畫, | zh_TW |
| dc.subject.keyword | Pacific decadal variability,PDO,TPDV,teleconnection,oceanic tunnel,Pacific STCs,CESM,CMIP6, | en |
| dc.relation.page | 90 | |
| dc.identifier.doi | 10.6342/NTU202103637 | |
| dc.rights.note | 同意授權(全球公開) | |
| dc.date.accepted | 2021-10-13 | |
| 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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