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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 魏國彥(Kuo-Yen Wei) | |
| dc.contributor.author | Yi-Chi Chen | en |
| dc.contributor.author | 陳怡綺 | zh_TW |
| dc.date.accessioned | 2021-05-20T21:16:03Z | - |
| dc.date.available | 2011-02-20 | |
| dc.date.available | 2021-05-20T21:16:03Z | - |
| dc.date.copyright | 2011-02-20 | |
| dc.date.issued | 2011 | |
| dc.date.submitted | 2011-01-28 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/10273 | - |
| dc.description.abstract | The temperature and depth of the thermocline are crucial features of the upper water column in the equatorial Pacific because they relate to heat transfer and intermediate water circulation between high- and low-latitudes. To infer changes in thermocline structure of the southwestern equatorial Pacific during the last 25,000 years, we analyzed geochemical proxies of Pulleniatina obiquiloculata (355-425 μm), a thermocline-dwelling planktic foraminifera, from the sediment core MD05-2925 (9°20' S, 151°27' E, water depth: 1642 m) in the Solomon Sea.
Our results suggest that changes in magnitude and timing of the thermal gradient (ΔT) between surface and thermocline waters in western Pacific warm pool differed from that in the East Equatorial Pacific since the Last Glacial Maximim. The depth of thermocline in the Solomon Sea site has been shoaled continuously, probably relates to the increased tilt of thermocline across the equator. The presence of a δ13C minimum at the end of the deglaciation suggests that the thermocline in western equatorial Pacific might have played a role in “ocean tunneling” connecting the high- and low-latitude feedback loop during the Termination I. Our results collaborate with a previous hypothesis that during the deglaciation the 13C-depleted water has increased its production rate in the Southern Ocean and therefore expanded supplying more nutrients to the thermocline waters of the southwest Pacific warm pool. | en |
| dc.description.provenance | Made available in DSpace on 2021-05-20T21:16:03Z (GMT). No. of bitstreams: 1 ntu-100-R97224102-1.pdf: 2231911 bytes, checksum: f64998a71c37cf8d6532e34e1d9c6b66 (MD5) Previous issue date: 2011 | en |
| dc.description.tableofcontents | 第一章 緒論.............................1
1.1 赤道太平洋表層水體結構特徵..........1 1.2 西太平洋暖池之古海洋相關研究........5 1.3 末次冰盛期以來全球古氣候相關研究....6 1.4 研究動機............................7 第二章 研究方法.........................9 2.1 研究材料............................9 2.2 年代模式的建立......................9 2.3 古溫度計的原理.....................12 2.3.1 有孔蟲殼體鎂鈣比值古溫度計........12 2.3.2 鎂鈣分析樣本前處理................12 2.4 有孔蟲殼體的氧碳同位素..............14 2.4.1 氧同位素的定義及影響因素..........14 2.5 有孔蟲Globigerinoides ruber 和Pulleniatina obliquiloculata的生態特性...............16 2.6 表層水體垂直結構的重建..............17 第三章 研究結果與討論...................19 3.1 年代模式結果.......................19 3.2 上部溫躍層海水古溫度的重建.........21 3.2.1 P. obliquiloculata殼體鎂鈣比值分析結果.....21 3.2.2 評估前處理的有效性.........................21 3.2.3 古上部溫躍層海水溫度的轉換結果.............21 3.2.4 西赤道太平洋溫躍層的溫度紀錄...............22 3.3 古海水氧同位素值的重建......................29 3.3.1 古海水氧同位素值的推估.....................29 3.3.2 古海水氧同位素值的紀錄.....................29 3.4 表層垂直水體結構的重建......................33 3.4.1 表層垂直水體結構的重建結果.................33 3.4.2 東西赤道太平洋溫躍層的紀錄.................34 3.5 P. obliquiloculata殼體碳同位素的變化........36 3.5.1岩芯MD05-2925 P. obliquiloculata殼體碳同位素的紀錄..36 3.5.2赤道太平洋有孔蟲殼體碳同位素的紀錄..................36 3.6赤道太平洋溫躍層變化與全球氣候的連結..................38 第四章 結論..............................................40 參考文獻.................................................41 | |
| dc.language.iso | zh-TW | |
| dc.title | 西太平洋暖池南緣溫躍層二萬五千年來的水文變化 | zh_TW |
| dc.title | Thermocline variabilities at the southern margin of the western Pacific warm pool during the last 25,000 years | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 99-1 | |
| dc.description.degree | 碩士 | |
| dc.contributor.coadvisor | 李紅春(Hong-Chun Li) | |
| dc.contributor.oralexamcommittee | 陳明德,米泓生,沈川洲 | |
| dc.subject.keyword | 西太平洋暖池,溫躍層,鎂鈣元素比古溫度計,表層垂直水體溫度梯度,冰消期,末次冰盛期, | zh_TW |
| dc.subject.keyword | thermoclime,Indo-Pacific Warm Pool,deglaciation,Last Glacial Maximim,Mg/Ca-paleothermometry, | en |
| dc.relation.page | 49 | |
| dc.rights.note | 同意授權(全球公開) | |
| dc.date.accepted | 2011-01-28 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 地質科學研究所 | zh_TW |
| 顯示於系所單位： | 地質科學系 | |
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