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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳于高(Yue-Gau, Chen) | |
| dc.contributor.author | "Chi-Dung, Nguyen" | en |
| dc.contributor.author | 阮志勇 | zh_TW |
| dc.date.accessioned | 2021-06-15T04:28:52Z | - |
| dc.date.available | 2010-08-20 | |
| dc.date.copyright | 2009-08-20 | |
| dc.date.issued | 2009 | |
| dc.date.submitted | 2009-08-20 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/45587 | - |
| dc.description.abstract | Northern Vietnam is an ideal place to address the influence of Asian summer monsoon (ASM) or Indian Ocean monsoon (IOM) in the Indo-China Peninsula area. Besides, speleothem is an excellent material of terrestrial climate proxy due to continuous growth over thousands of years in different regions and can be dated precisely by U-Th dating. Twenty-two 230Th ages and 506 δ18O data were obtained from a stalagmite 2.9-3. The chronology is from 22.87±0.07 ka in the top to 30.21±0.12 ka in the bottom with the best precision as 62 years, but one hiatus was found in 27.8-25.4 ka. This study followed Wang et al. (2001) thought and attributed the δ18O decreasing to the amount effect of summer precipitation. Two implied strong ASM periods from 30.21 ka to 27.77 ka were temporally consistent and isotopically comparable with the Hulu record, which confirmed the north Indo-China Peninsula was mainly influenced by ASM. This study thus supported the synchronicity of millennial events all over the world. However, millennial events were punctuated by hundreds-of-year episodes and it left the debatable and unsolved questions for existing and timing of centennial-scale events. Comparing the 2.9-3 record to the Greenland ice core record, three discrepancies were presented. First, the onset of the strong ASM in 30.18-28.47 ka led the GIS 4 warming event about 1.28 ± 0.9 ka. Second, the duration of 1.71 kyrs for the ASM is longer than that of 0.5-0.6 kyrs for GIS4. Third, the symmetry-type strong ASM episode contrasted to the see-saw-type millennial event in the north Atlantic. Lastly based on the spatial comparisons and the oxygen isotope features, the hypothesis was preferred that changes in the dynamics of the tropical atmosphere-ocean system resulted in the cyclic millennial events. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-15T04:28:52Z (GMT). No. of bitstreams: 1 ntu-98-R96224219-1.pdf: 3197802 bytes, checksum: 515d284326ac2edbcdd3458250287f43 (MD5) Previous issue date: 2009 | en |
| dc.description.tableofcontents | List of figure v
List of tables vii Abstract viii Chapter 1 Introduction 1 1.1 Introduction…………………………………………………………………... 1 1.1.1 Purpose of this study…………………………………………...………. 1 1.1.2 The principle of speleothem as a paleoclimatic archive………………. 2 1.2 Modern Climate of study area……………………………………………….. 6 1.3 Sampled location…………………………………..……………..………….. 6 Chapter 2. Material and experiments 9 2.1 Stable isotopes……………………………………………………………….. 9 2.2 230Th dating…………………………………………………………………… 11 2.2.1 Subsampling process and treatment………………………………......... 12 2.2.2 Sample digestion……………………………………………………….. 12 2.2.3 Iron co-precipitation………………………………………………......... 12 2.2.4 Collection of uranium and thorium…………………………………….. 13 2.2.5 U-Th Measurement - Thermo Electron NEPTUNE………………......... 13 Chapter 3. Results 15 3.1 The age model……………………………………………………………… 15 3.2 Stable isotope equilibrium …………………………………………………… 19 3.3 The δ18O record……………………………………………………………..... 21 Chapter 4. Discussion 25 4.1 Interpretation of δ18O values from northwestern Vietnam record……………. 25 4.2 Comparison with others records……………………………………………… 26 4.2.1 Comparison to Hulu record…………………………………………….. 28 4.2.2 Comparison to ice core record………………………………………….. 32 4.3 Mechanism support………………………………………………………… 33 Chapter 5. Conclusions 35 References 36 Appendix A-1: Stable isotope of MAB for stalagmite 2.9-3 43 Appendix A-2: Stable isotope of MAB for stalagmite 2.9-05b 44 Appendix B-1: Raw data of stalagmite 2.9-3 45 Appendix B-2: Raw data of stalagmite 2.9-05b 52 | |
| dc.language.iso | en | |
| dc.subject | No | zh_TW |
| dc.subject | Vietnam | en |
| dc.subject | Speleothem | en |
| dc.subject | Paleoclimate | en |
| dc.subject | Oxygen Isotope | en |
| dc.subject | Asian monsoon | en |
| dc.title | 從越南北部高解析度之石筍紀錄探討三萬至二萬二千年前的亞洲夏季季風變化 | zh_TW |
| dc.title | A decadal-resolution stalagmite record of Asian summer monsoon during 22-30 thousand years before present in Northwestern Vietnam | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 97-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.coadvisor | 沈川洲(Chuan-Chou, Shen) | |
| dc.contributor.oralexamcommittee | 李德春(Der-Chuen, Lee),米泓生(Horng-Sheng, Mii),李紅春(Hong-Chun, Li) | |
| dc.subject.keyword | No, | zh_TW |
| dc.subject.keyword | Speleothem,Paleoclimate,Oxygen Isotope,Asian monsoon,Vietnam, | en |
| dc.relation.page | 53 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2009-08-20 | |
| 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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