海洋生物生產力是海洋調控二氧化碳濃度變動的主要參數之一，而氮營養鹽（主要為NO3－）是初級生產者進行光合作用合成本身有機體必須的物質之一，因此其含量的供需狀況是控制初級生產力多寡的重要控因之一。表層海水營養鹽的含量及生產者的多寡會影響營養鹽被利用的程度，而此不同的結果會反映在氮的同位素組成的分化效應上。因此，本論文工作是希望藉由分析沈積物中氮同位素值記錄隨時間的變化來重建班達海域古海洋表水氮營養鹽的利用率及其隨古環境
與古氣候變遷的訊息。
本論文研究乃利用法國海洋研究船瑪麗安·杜帆（Marion Dufresne）號於2001年夏天執行國際海洋古全球變遷計劃（IMAGES）第七航次時，在屬西太平洋邊緣海之班達海（Banda Sea）所採集的MD012380 岩芯進行分析研究工作。分析工作包含此岩芯的氮同位素（δ15N）值，沈積物之總有機碳組成（TOC）、總有機碳/總氮比值（Corg/N atomic ratio）及有機碳的碳同位素（δ13C）組成等。其中氮與
碳元素與同位素的分析方法主要是採取燃燒法（combustion method），將沈積物經高溫燃燒後所釋放出的氣體（N2、CO2）收集後以質譜儀及元素分析儀進行其同位素值與C、N 含量的測定。分析的標本因受限於氧同素所建立的時間架構，故只以自本岩芯頂部至2082 公分（氧同位素定年結果為250ka）以來的結果作討論。
此部份的分析資料相當於MIS7 與8 交界（250ka）以來的最近三次冰期-間冰期的變遷。
MD012380 岩芯之氮同位素分析結果落於5.24~8.81‰之間，在暖期之MIS1氮同位素值平均約為7.51‰，MIS5 除了73ka 出現較低的氮同位素值（5.24‰）外，其餘平均約為6.92‰，到了冷期的MIS2 為6.31‰、MIS3 為6.63‰、MIS4 則為6.63‰，整體的氮同位素值變化可看到冷期低-暖期高的趨勢，但在MIS6 及7 則有約2‰的震盪，且無法區隔MIS6 與7 之間的變動差異。利用本岩芯所在的海域之現今水文資料、岩芯本身氮同位素組成與總氮含量的關係及其與總有機碳隨時間變動的趨勢，再加上岩芯中有機氮相對於有機碳比值及碳同位素組成，推斷本岩芯所紀錄的氮同位素組成並不具有固氮作用的訊號，且可排除成岩作用及脫硝作用的影響，而其中有機物的來源屬於海源的特徵。因此，MD012380 岩芯的碳、氮同位素組成的結果應可反映班達海域表層水的同位素分化的效應。
所以，本研究利用拉雷分化效應公式可計算粗估班達海域之古海洋環境中表層水營養鹽利用率及其隨時間的變動趨勢。估算的結果反映出在冷期時班達海地區的浮游植物對營養鹽的利用率較低而暖期較高。再配合代表生產力變動的總有機碳含量結果發現MD012380 岩芯沈積物在冷期時總有機碳含量較高但δ15N 較輕；相反地，暖期的總有機碳含量較低且δ15N 較重，這些指標反映在冷期時有較高的生產力，且氮營養鹽的利用率較低。由此推測岩芯中冷期-暖期變化的氮同位
素組成應非生物生產力變動而造成其對營養鹽攝取量的不足，而應是營養鹽供應量在冷期時有明顯的增加所造成的結果。而此較多營養鹽的供輸極可能是因班達海地區於冷期時因季風強度的改變使表水有較明顯的湧昇流強度增強的效應而導致營養鹽由深層水的供應量增加，因此使得浮游植物對硝酸根離子的利用率變低的結果。

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