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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 任昊佳(Haojia Ren) | |
| dc.contributor.author | Er-Wen Yang | en |
| dc.contributor.author | 楊爾文 | zh_TW |
| dc.date.accessioned | 2022-11-25T07:58:57Z | - |
| dc.date.copyright | 2021-10-13 | |
| dc.date.issued | 2021 | |
| dc.date.submitted | 2021-09-30 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/82750 | - |
| dc.description.abstract | 在表層海水屬於貧營養鹽環境的海域，其海洋沉積物的氮同位素值理論上反映表層海水氮源的變化，然而，沉積物的氮同位素值可能受到陸源的氮以及成岩作用所影響，相對地，浮游有孔蟲殼體內保存的有機質，其氮同位素值更能可靠地反映古代海洋的訊號。本研究的研究區域位於東海的沖繩海槽，此處的透光層的氮源主要來自黑潮的次表層水。本研究分析了來自沖繩海槽岩心的浮游有孔蟲氮同位素，建構了末次冰期最盛期以來的高解析度氮同位素紀錄。紀錄中顯示，從末次冰期最盛期到晚全新世，有孔蟲的氮同位素值降低了2.5‰，此變化和前人發表的南海的浮游有孔蟲氮同位素紀錄非常相似。本研究的分析結果支持前人提出的假說，顯示在廣而淺的西太平洋陸棚上，海平面的變化透過影響沉積物脫氮作用的速率，而間接控制了表層海水中的固氮作用的速率。本研究的有孔蟲氮同位素紀錄和前人在同一根岩心所做的沉積物氮同位素紀錄，在同位素的數值以及變化趨勢上都不相同，而後者明顯受到陸地的氮輸入以及複雜的再沉積作用所影響。有孔蟲氮同位素紀錄也出現三次氮同位素值降低的事件，與三次北半球的冷事件 (Heinrich Stadial 1、新仙女木事件以及8.2千年事件)幾乎同步發生。對此，最可能的解釋是北大西洋的海表溫度變化在千年尺度上，影響了北太平洋副熱帶環流系統及黑潮的強度，使得黑潮在冷事件發生時有增強的情形。 | zh_TW |
| dc.description.provenance | Made available in DSpace on 2022-11-25T07:58:57Z (GMT). No. of bitstreams: 1 U0001-3009202117111500.pdf: 2790538 bytes, checksum: 094f13502560645c0ebae027303056aa (MD5) Previous issue date: 2021 | en |
| dc.description.tableofcontents | "致謝 i 中文摘要 ii ABSTRACT iii CONTENTS iv Chapter 1 Introduction 1 1.1 Marine nitrogen cycle and controlling factors on N fixation 1 1.2 Understanding marine nutrient dynamics by nitrogen isotopes 2 1.3 Reconstruction of ancient nutrient dynamics: δ15N record 5 1.4 δ15N record in the East China Sea and the South China Sea 6 1.5 This study 9 Chapter 2 Study Area 10 Chapter 3 Material and Method 13 3.1 Sediment Core MD01-2404 13 3.2 Planktonic Foraminifera Globigerinoides sacculifer 13 3.3 Foram-bound δ15N measurement 13 3.3.1 Pick, crush and clean the fossil shell 14 3.3.2 Shell-bound organic N release, oxidation, and N content measurement 14 3.3.3 The denitrifier method 16 3.3.4 Nitrogen isotope measurement 17 3.4 Modern seawater nitrate concentration and δ15N measurement 18 Chapter 4 Results 19 4.1 Comparison between modern subsurface nitrate δ15N and core-top FB-δ15N 20 4.2 FB-δ15N record of MD01-2404 20 Chapter 5 Discussion 22 5.1 The influence of Yangtze N input 22 5.2 Glacial/interglacial variations in FB-δ15N record 22 5.2.1 N fixation/denitrification coupling regulated by sea level change 22 5.2.2 Asynchronicity between FB-δ15N and sea level after 8 ka 23 5.3 Millennial-scale variations in FB-δ15N record 24 5.3.1 Local N fixation affected by aeolian dust 27 5.3.2 Signal transported from Eastern Tropical Pacific 27 5.3.3 Strengthened Kuroshio lowers the mixed subsurface δ15N signal 28 Chapter 6 Conclusions 31 References 32 " | |
| dc.language.iso | en | |
| dc.subject | 有孔蟲氮同位素 | zh_TW |
| dc.subject | 黑潮 | zh_TW |
| dc.subject | 氮循環 | zh_TW |
| dc.subject | 沖繩海槽 | zh_TW |
| dc.subject | 末次冰期最盛期 | zh_TW |
| dc.subject | Okinawa Trough | en |
| dc.subject | Last Glacial Maximum | en |
| dc.subject | Nitrogen cycle | en |
| dc.subject | Foram-bound nitrogen isotopes | en |
| dc.subject | Kuroshio | en |
| dc.title | 末次冰期最盛期以來的沖繩海槽氮同位素變化受固氮作用及黑潮強度之影響 | zh_TW |
| dc.title | Nitrogen isotopes in the Okinawa Trough regulated by regional N fixation and Kuroshio transport since the Last Glacial Maximum | en |
| dc.date.schoolyear | 109-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 張詠斌(Hsin-Tsai Liu),賀詩琳(Chih-Yang Tseng) | |
| dc.subject.keyword | 末次冰期最盛期,氮循環,有孔蟲氮同位素,黑潮,沖繩海槽, | zh_TW |
| dc.subject.keyword | Last Glacial Maximum,Nitrogen cycle,Foram-bound nitrogen isotopes,Kuroshio,Okinawa Trough, | en |
| dc.relation.page | 39 | |
| dc.identifier.doi | 10.6342/NTU202103477 | |
| dc.rights.note | 未授權 | |
| dc.date.accepted | 2021-10-01 | |
| 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 | 2023-09-30 | - |
| 顯示於系所單位： | 地質科學系 | |
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