臺灣博碩士論文加值系統

本研究利用西元2001年4月法國籍海洋研究船-瑪麗安‧杜帆妮號執行國際海洋古全球變遷計畫(International Marine Global Change Study, IMAGES)第七航次時，於班達海所採取的活塞式岩心MD012380(5°45’S, 126°54’E)，完成了岩心深度1~3691cm的底棲有孔蟲Cibicides wuellerstorfi穩定碳氧同位素之分析，建立了西赤道太平洋班達海最近72萬年以來高解析度的底棲有孔蟲氧同位素地層。岩心之底棲有孔蟲氧同位素分析值介於1.12 ‰ ~ 4.88 ‰，於冰期與間冰期間呈現明顯且規律的變化趨勢。對比標準曲線LR04以及使用軟體「Match」，並以粉紅色浮游有孔蟲 Globigerinoides ruber 末現面(~130ka)與古地磁倒轉事件作為年代參考點，本研究建立了岩心MD012380之底棲有孔蟲氧同位素地層年代模式。本研究並利用MD012380年代模式與標準曲線LR04進行交頻譜分析，結果顯示兩組時間序列的三個軌道力週期(100kyr離心率、41kyr黃道傾角以及23kyr歲差)之相干性均位於95%信賴區間之上，兩者之間的三個軌道力週期極接近同相。在100kyr離心率變化週期，浮游有孔蟲氧同位素明顯落後底棲有孔蟲氧同位素。本研究分析MD012380底棲與浮游有孔蟲氧同位素差值(δ18Obenthic-planktonic)，推估冰期時海水表層的水團性質為低溫高鹽，間冰期時海水表層則呈高溫低鹽的狀態。為了探討班達海深層水之溫鹽條件變化，本研究將MD012380底棲有孔蟲氧同位素曲線扣除冰原體積變化的影響(δ18Obenthic-ice sheet)，反映該區深層水的溫度與鹽度變化。δ18Obenthic-ice sheet曲線與MD012380底棲氧同位素曲線雖在整體上呈現相似的變化趨勢，但二條曲線在振幅變化上有顯著的差異，非冰原體積變化影響的δ18O曲線(δ18Obenthic-ice sheet)之振幅變化較小，代表冰原體積變化的影響對於底棲有孔蟲之δ18O變化的貢獻，大於深層水溫鹽度變化。

In this study, I used oxygen isotopes measured from benthic foraminiferal shells of Cibicides wuellerstorfi to establish an oxygen isotope stratigraphy for the past 720,000 years from a Banda Sea core MD012380 (5°45’S, 126°54’E). The benthic δ18O values in this core vary between 4.88 ‰ to 1.12 ‰ with obvious glacial and interglacial changes. For establishing our MD012380 benthic isotope stratigraphy, we tuned the oxygen isotope curve to a global benthic LR04 stack by the MATCH Program. The age tuning is also constrained by the last appearance datum of pink Globigerinoides ruber (~130ka) and the position of Brunhes/Matuyama magnetic reversal observed from the core. Cross-spectral analyses were conducted by using MD012380 benthic δ18O values and LR04 stack to reach near-zero phases at three major orbital frequency bands (100kyr-1, 41kyr-1, and 23kyr-1) that verify the validity of the age model. I also found that the planktic isotopes lag behind benthic at the eccentricity frequency band. I also substracted the planktic isotope values from the benthic, and the residuals δ18Obenthic-planktonic are mainly driven of local surface temperature and salinity changes. The results indicate that surface water in the Banda Sea has been characterized by low temperature and high salinity in glacials and high temperature and low salinity in interglacials. I also tested my data by removing the ice volume effect from the benthic δ18O variations of core MD012380 (δ18Obenthic-ice sheet), which reflect mainly local temperature and salinity effects of deep water. The δ18Obenthic-ice sheet curve and the benthic isotope share a similar pattern, though the amplitude of the δ18Obenthic-ice sheet is relatively smaller than the benthic isotope, indicating that the global ice volume effect on the isotope composition changes of water mass is much stronger than the water mass property changes in the deep water.

摘要..........................................I
Abstract.....................................II
目錄.........................................III
圖次..........................................V
表次..........................................V
一、緒論.................................... ..1
1.1 西太平洋暖池區..............................1
1.2 研究動機與目的..............................1
1.3 區域水文環境................................2
1.4 穩定氧同位素................................3
1.5 影響底棲氧同位素的環境因子....................3
二、研究材料與方法...............................5
2.1 研究材料....................................5
2.2 底棲有孔蟲氧同位素分析........................5
2.3 年代模式....................................7
三、研究結果.....................................9
3.1 底棲有孔蟲穩定氧同位素地層....................9
3.2 年代模式....................................9
3.3 底棲有孔蟲氧同位素的變化.....................10
四、討論.......................................11
五、結論.......................................13
參考文獻.......................................14
圖說...........................................19
附錄...........................................38

附表 一 MD012380底棲有孔蟲C. wuellerstorfi氧同位素資料.....38

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