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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 施路易(Ludvig Löwemark) | |
| dc.contributor.author | Bor-Jiun Jong | en |
| dc.contributor.author | 鍾伯均 | zh_TW |
| dc.date.accessioned | 2022-11-25T03:05:13Z | - |
| dc.date.available | 2023-07-31 | |
| dc.date.copyright | 2021-08-18 | |
| dc.date.issued | 2021 | |
| dc.date.submitted | 2021-07-14 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/81858 | - |
| dc.description.abstract | "北極海周圍之河流淡水注入對於其海洋循環具有重要的調節作用，而來自北極海的淡水與北大西洋深層水(North Atlantic Deep Water, NADW)的生成亦有著密切的連動關係。因此，北極海河流淡水注入在全球海洋系統中有其獨特重要性。觀測研究顯示，自1938年到1999年隨著全球地表氣溫增加，北極海周圍的河流注入量每年平均增加7%，顯著改變北極海的淡水相對含量。因此，了解河流淡水注入的增加對於海洋與氣候系統的影響，為氣候研究中重要的議題之一。 透過地質紀錄，我們得以獲取在長時間尺度下，河流注入與地球系統之間交互作用的證據。其中，浮游性有孔蟲中的鋇鈣元素比，在過去的中低緯度研究中被證實為有效的河流注入指標。前人研究指出，海洋中鋇元素之主要來源為河流注入，在有孔蟲造殼的過程中，其周圍海水鋇離子會與殼體結合，因而反應了海水中鋇元素豐度變化。然而，在北極海中的鋇元素，除了河流注入為主要來源外，同時也受到海洋生產力相關之生物移除作用(biological removal)與再礦化作用(remineralization)影響。因此，本研究目的為了解河流注入與生物移除作用對於浮游性有孔蟲中鋇鈣元素比之影響，並評估此新穎的工具，是否可以在北極海研究中作為可靠的河流注入指標。 本研究選取6根海洋沉積物岩芯與11個表層沉積物樣本，以涵蓋北極海歐亞海盆(Eurasian Basin)側之空間變化。分析所使用的浮游性有孔蟲為Neogloboquadrina pachyderma (sinistral)，並運用設立於國立臺灣大學地質科學系的磁場式感應藕荷電漿質譜儀(Sector Field Inductively Coupled Plasma Mass Spectrometry, SF-ICP-MS)分析其殼體內微量元素含量。研究結果建立了過去四萬年以來北極海中鋇鈣元素比的時空分佈，並發現浮游性有孔蟲受到沉積後成岩作用(Diagenesis)影響的證據。透過使用掃描式電子顯微鏡(Scanning Electron Microscope, SEM)與能量散射光譜儀(Energy Dispersive Spectroscopy, EDS)分析後，發現特定岩芯與深度的N. pachyderma表面受到碳酸鈣再結晶作用影響，導致異常高的鎂鈣元素比，可高達正常值的三到十倍高，但鋇鈣元素比並未受到影響。 位在歐亞海盆中周圍的拉普捷夫海(Laptev Sea)與喀拉海(Kara Sea)接收來自歐亞大陸的河流注入。N. pachyderma的鋇鈣元素比，自歐亞海盆中央朝拉普捷夫海與喀拉海方向，呈現數值升高的趨勢。鋇鈣元素比朝陸地的上升趨勢，與現代海水鋇元素分析有著相似的空間變化，顯示表層沉積物之N. pachyderma的鋇鈣元素比可以反應近代海水鋇元素在北極海中的空間分佈。在過去四萬年之N. pachyderma的鋇鈣元素比紀錄中，則發現在全新世 (Holocene)時，呈現較低的比值，而在海洋氧同位素階2-3期 （Marine Isotope Stages 3-2）呈現較高的比值。此一結果與我們的研究假設相反；如果鋇鈣元素比是受到河流注入主導的話，在河流注入量較大的全新世時期，應有較高的浮游性有孔蟲鋇鈣元素比值。由此可見，有其他非河流注入之因素顯著地影響北極海中的浮游性有孔蟲之鋇鈣元素比。 本研究認為，浮游性有孔蟲鋇鈣元素比反應的海水鋇元素相對豐度變化，在間冰期是受到海洋中旺盛的初級生產力影響，加速海水中鋇元素的生物移除作用；再加上間冰期較高的海水面高度，加長了鋇元素自出海口到北極海中央的運送距離，兩個主要因素導致較低的鋇鈣元素比。在冰期時，較弱的海洋生產力降低了鋇元素的生物移除作用，加上較低的海水面縮短了鋇元素的運送距離，導致此時期呈現較高的鋇鈣元素比。此研究顯示：一、浮游性有孔蟲N. pachyderma的鋇鈣元素比可以反應北極海中海水的鋇元素豐度變化。二，在北極海中的鋇元素循環，除了受到河流注入的掌控外，海洋生產力相關的生物移除作用也扮演重要的角色。" | zh_TW |
| dc.description.provenance | Made available in DSpace on 2022-11-25T03:05:13Z (GMT). No. of bitstreams: 1 U0001-0507202111301300.pdf: 5739054 bytes, checksum: 96018c50ba787d68fef5419c20123d5d (MD5) Previous issue date: 2021 | en |
| dc.description.tableofcontents | "誌謝 II 中文摘要 IV Abstract VI Contents VIII List of figures X List of tables XV Chapter 1 Introduction 1 1.1 The relationship between Arctic Ocean, global ocean and climate system 1 1.2 The freshwater system and river input in the Arctic Ocean 2 1.3 Ba/Ca ratios of planktic foraminifera in the Arctic Ocean 4 1.4 Studies of seawater Ba in the Arctic Ocean 5 1.5 Planktic foraminifera in the Arctic Ocean 8 1.6 The goal of this study 9 Chapter 2 Material and Methods 10 2.1 Material 10 2.1.1 Sample location 10 2.1.2 Core selection 12 2.1.3 Sediment sieving 14 2.1.4 Planktic foraminifera 14 2.2 Trace elements 15 2.2.1 Vial cleaning 15 2.2.2 Foraminiferal cleaning procedures and dissolution 16 2.2.3 Analytical methods 19 2.2.4 Sample overprint issues by background noise during experiment 20 2.2.5 Single specimen test 21 2.2.6 Interlaboratory comparison with Heidelberg University 22 2.3 Stable isotopes 23 2.4 Radiocarbon dating 23 2.5 Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS) and Electron Probe Micro Analyzer (EPMA) 24 Chapter 3 Results 25 3.1 Radiocarbon dating 25 3.2 Additional Experiments to trace element analysis 26 3.3 Trace element 33 3.3.1 Spatial variation of Ba/Ca ratios in the Arctic Ocean 33 3.3.2 Spatial variation of Mg/Ca ratios in the Arctic Ocean 35 3.3.3 Time series of Ba/Ca ratios in the Arctic Ocean 36 3.3.4 Time series of Mg/Ca 36 3.4 Stable isotopes 42 3.4.1 Variation in oxygen isotopes in the Arctic Ocean 42 3.4.2 Variation of carbon isotopes in the Arctic Ocean 43 3.4.3 Time series of oxygen isotopes 44 3.4.4 Time series of carbon isotopes 44 3.5 Scanning Electron Microbe and EPMA 45 3.5.1 Diagenetic effects under the SEM 45 3.5.2 Energy Dispersive X-ray Spectroscopy (EDS): Qualitative Mg distribution in N. pachyderma shell 50 3.5.3 Field Emission Electron Probe Microanalyzer (EPMA): Quantitative Mg concentration in the high Mg-band 52 Chapter 4 Discussion 54 4.1 The efficiency and reliability of cleaning process 54 4.2 Radiocarbon dating 54 4.3 Diagenetic effect 56 4.4 Stable isotopes in the Arctic Ocean 59 4.5 Ba/Ca ratios: Spatial variation 61 4.5.1 Comparison to stable isotopes 62 4.5.2 Comparison to modern seawater records 62 4.5.3 How does the habitat of N. pachyderma affect the values of Ba/Ca ratios? 65 4.5.4 The spatial variation of Ba/Ca ratios in the Arctic Ocean 65 4.6 Ba/Ca ratios: Temporal variability 66 4.6.1 Temporal variability 66 4.6.2 Factors controlling the past Ba cycle 68 4.6.3 Ba cycle during glacial and interglacial periods 69 4.6.4 The influence of river input on the Ba/Ca ratios 72 4.6.5 Limitations of the Ba/Ca ratios record 72 Chapter 5 Conclusions 73 Reference 74 Appendix 83" | |
| dc.language.iso | en | |
| dc.subject | 鋇元素循環 | zh_TW |
| dc.subject | 鋇鈣元素比 | zh_TW |
| dc.subject | 生物移除作用 | zh_TW |
| dc.subject | 北極海 | zh_TW |
| dc.subject | 河流注入 | zh_TW |
| dc.subject | 浮游性有孔蟲 | zh_TW |
| dc.subject | Ba cycle | en |
| dc.subject | biological removal | en |
| dc.subject | river input | en |
| dc.subject | Ba/Ca ratios | en |
| dc.subject | planktic foraminifera | en |
| dc.subject | Arctic Ocean | en |
| dc.title | 北極海浮游性有孔蟲(Neogloboquadrina pachyderma)殼體之鋇鈣比時空分佈 | zh_TW |
| dc.title | Spatio-temporal Ba/Ca variations of planktic foraminifera (Neogloboquadrina pachyderma) in the Arctic Ocean | en |
| dc.date.schoolyear | 109-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 賀詩琳(Hsin-Tsai Liu),羅立(Chih-Yang Tseng),沈川洲 | |
| dc.subject.keyword | 北極海,浮游性有孔蟲,鋇鈣元素比,鋇元素循環,河流注入,生物移除作用, | zh_TW |
| dc.subject.keyword | Arctic Ocean,planktic foraminifera,Ba/Ca ratios,Ba cycle,river input,biological removal, | en |
| dc.relation.page | 86 | |
| dc.identifier.doi | 10.6342/NTU202101270 | |
| dc.rights.note | 同意授權(全球公開) | |
| dc.date.accepted | 2021-07-15 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 地質科學研究所 | zh_TW |
| dc.date.embargo-lift | 2023-07-31 | - |
| 顯示於系所單位： | 地質科學系 | |
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