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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳于高 | |
| dc.contributor.author | Yi-Wei Liu | en |
| dc.contributor.author | 劉怡偉 | zh_TW |
| dc.date.accessioned | 2021-06-15T04:02:10Z | - |
| dc.date.available | 2010-03-10 | |
| dc.date.copyright | 2010-03-10 | |
| dc.date.issued | 2010 | |
| dc.date.submitted | 2010-02-20 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/45037 | - |
| dc.description.abstract | 本文以珊瑚為題材，利用台大的多接收器電漿耦合質譜儀 (MC-ICP-MS, NEPTUNE) 及中研院的熱游離質譜儀 (TIMS, TRITON) 合併Double spike技術，針對南灣地區現生微孔珊瑚 (Porites) 中的鍶同位素 (87Sr/86Sr, δ88/86Sr) 進行分析，並討論其變化與環境間的關係。在研究環境變遷議題時，珊瑚的碳酸鈣骨骼為很好的研究材料，因為在其生長時，常會將周遭環境的變化詳細記錄在其中。南海位於西太平洋暖池 (Western Pacific Warm Pool) 邊緣，其水文的變化同時對臺灣的氣候有所影響。台灣南端的南灣地區有許多保存良好的珊瑚，又正位於太平洋和南海海水混合通道的一端，因此可藉分析其碳酸鈣骨骼中的鍶同位素，來看黑潮水與南海海水的混合狀況，並探討洋流受到聖嬰反聖嬰之南方震盪週期的變化。
由編號NW的珊瑚中1992-2002的冬夏記錄可發現，δ88/86Sr在1992-2002年間的變化小於0.1‰，無論冬夏季節間或年際間都沒有明顯變化，顯示其在此不能做為海水溫度計。兩臺不同質譜儀所得到的87Sr/86Sr大部分都落在0.70917，然而在1994-1995和1996年，87Sr/86Sr的比值有約30-40ppm的下降。進一步以更高的解析度去分析編號NOW的珊瑚中1994-1996年的87Sr/86Sr，並同時測量氧同位素及鍶鈣比。其中鍶同位素和編號NW的珊瑚有相同的變化趨勢，由此可推論此變化應可代表區域環境的變動。討論可能造成珊瑚中鍶同位素變化的原因，由於鍶同位素不像氧同位素和鍶鈣比有明顯的季節性，因此溫度和降水的因素可先排除。若僅考慮水平方向海水和淡水的混合，無法得到珊瑚中較低的鍶同位素比值，從大洋中鍶同位素剖面來看，次表層水以下的海水其鍶同位素比值較輕，可能是供應的來源。 將1992-2002的87Sr/86Sr記錄和聖嬰指數相比，發現兩者有不錯的相關性，在強聖嬰年如1994-1995和1998年時，鍶同位素的比值都會相對較低。黑潮支流入侵南中國海的狀況已被發現一年四季皆有，除此之外，其強度和聖嬰現象有很好的相關性，在聖嬰年時強度較強，反聖嬰年則較弱。由於呂宋海峽海底地勢高起的原因，當黑潮支流入侵時會因為分層的海水被擠壓而產生擾動，為了達到新的平衡，便會有次表水和表水混合的情況出現。加上黑潮支流流經呂宋島弧，很可能交換出較低的87Sr/86Sr比值。由聖嬰相關的黑潮支流入侵南中國海的事件可以解釋87Sr/86Sr在珊瑚中的變化情形，因此藉由分析珊瑚骨骼中鍶同位素的比值，我們可以回顧過去發生過的相關事件。 | zh_TW |
| dc.description.abstract | Monthly resolution 87Sr/86Sr records of living coral Porites heads, collected in the Nanwan Bay, southernmost Taiwan (21o55’N, 120o47’E), were analyzed by a MC-ICP-MS at the Department of Geosciences, National Taiwan University. For stable Sr isotopic analysis, a 84Sr/86Sr double spike method was applied on TIMS at Institute of Earth Sciences, SINICA. The data show no relationship between δ88/86Sr and seawater temperature. Between the time window of 1992 and 2002, 87Sr/86Sr ratios show good relationship with the ENSO index. No relationship is found between 87Sr/86Sr and climate proxy data, both Sr/Ca and δ18O, which suggests that the effect of temperature and fresh water input are negligible to the observed fluctuations of 87Sr/86Sr in these corals. By checking 87Sr/86Sr in Nanwan water, it shows that a simple two end-member mixing model cannot explain the observations. A profound magnitude of subsurface water upwelling with low 87Sr/86Sr should be included to contribute low Sr isotopic ratio in southern Taiwan. Compare to the Nino 3.4 index, the results show that during strong El Nino years such like 1994-1995 and 1998, 87Sr/86Sr ratios were lower than the average. On the contrary, in 1999 and 2000 La Nina years, 87Sr/86Sr values were higher than the others. This suggests that the variation of radiogenic Sr isotopes probably related to ENSO variability (Fig. 4.2). ENSO related Luzon Strait transport and the corresponding remix of surface and subsurface seawater were found (Hsu and Liu, 2004; Qu et al., 2004), and these events in the past may be traced by 87Sr/86Sr in corals. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-15T04:02:10Z (GMT). No. of bitstreams: 1 ntu-99-R97224103-1.pdf: 1919565 bytes, checksum: 217ccf265e8e6117934622cce9fee92f (MD5) Previous issue date: 2010 | en |
| dc.description.tableofcontents | Table of Contents I
Figure List III Table List V 摘要 (Abstract in Chinese) VI Abstract VIII Chapter 1 Introduction 1 1.1 Motivation 1 1.2 Study area 2 1.3 Sample 3 1.4 Strontium isotopes 4 1.5 Double spike applications 5 1.6 Outline 8 Chapter 2 Methodology 9 2.1 Sampling 9 2.2 Chemical pre-treatment 11 2.3 Instrumental analysis 12 2.3.1 Oxygen stable isotopes 12 2.3.2 Sr/Ca 13 2.3.3 Strontium isotopic analysis on Neptune 14 2.3.4 Strontium isotopic analysis on Triton 16 Chapter 3 Results 23 3.1 Coral 23 3.2 Water 27 Chapter 4 Discussion 30 4.1 Coral δ88/86Sr data 30 4.2 87Sr/86Sr data on different instruments 31 4.3 Coral 87Sr/86Sr variations 32 4.4 87Sr/86Sr variations in seawater profiles 37 4.5 ENSO related signal and intrusion of the branch of the Kuroshio 40 Chapter 5 Conclusion 43 Chapter 6 References 45 Appendix 52 Data of stable isotope standard MAB 52 Sr/Ca data of coral M working standard 53 87Sr/86Sr data of NBS987 on NEPTUNE 54 Raw data of coral NW (on NEPTUNE) 57 Raw data of coral NW (on TRITON) 58 Raw data of coral NWO 59 Raw data of NWSWA 61 Raw data of NWSWB 62 Raw data of NWSWC 63 CTD data 64 | |
| dc.language.iso | en | |
| dc.title | 恆春南灣微孔珊瑚骨骼中鍶同位素自然變化之研究 | zh_TW |
| dc.title | Natural Variation of Sr Isotopes in coral Porites Collected from Nanwan Bay, Southern Tip of Taiwan | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 98-1 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 沈川洲,李德春,沈君山,李紅春 | |
| dc.subject.keyword | 珊瑚,鍶同位素,南灣, | zh_TW |
| dc.subject.keyword | Coral,Sr isotopes,Nanwan Bay, | en |
| dc.relation.page | 78 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2010-02-22 | |
| 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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