臺灣海峽為連接中國大陸兩大邊緣海東海與南海的水道，匯聚了經洋流搬運的臺灣與中國大陸河川輸出的沉積物，而在地形特徵方面，有臺灣灘、澎湖水道、觀音凹陷、烏坵凹陷以及彰雲隆起等不同的地貌坐落其中，這些因素共同造就臺灣海峽多變複雜的沉積環境。不飽和烯酮類是由鈣板藻所分泌的物質，透過氣相層析儀串接火炎離子偵測器，本研究主要分析臺灣海峽表層沉積物內不飽和烯酮類化合物的含量，透過分析海洋生物源有機質的空間分布，找出其與陸源有機質的異同處，並討論影響其分布的主要因素。根據前人研究，臺灣海峽總有機碳的分布主要是受控於流場，並且與臺灣海峽沉積物之泥質帶分布相同，泥質帶沉積物來源主要是臺灣西部河川的現代沉積物與中國沿岸河川所輸入。本研究結果顯示，不飽和烯酮類分布的趨勢與總有機碳並不相同，大陸沿岸地區不飽和烯酮類濃度略高於臺灣島西側沿岸，但是在福建沿海地區具有明顯的高濃度值，且總有機碳中的不飽和烯酮類所佔比例極低，顯示臺灣海峽有機質的分布主要是受陸源有機質供應所主導，也反映不飽和烯酮類的空間分布不受粒徑的影響。據推測造成不飽和烯酮類分布趨勢的主要因素為地形及湧升流，而非海洋生物源的沉積物所造成的稀釋效應也非常明顯，顯示臺灣海峽不是海洋生物源有機質的主要碳匯地點。

The Taiwan Strait serves as a transporting route to connect two mainly marginal seas of the Asia Continent, the East China Sea and the South China Sea, and receives large amounts of riverine sediment from Taiwan Island and Mainland China, respectively. The landscape of Taiwan Strait distinguishes with Taiwan Shoal, Peng-hu Channel, Kuan-Yin Depression, Wu-Chiu Depression, and Chan-Yuen Rise, which makes it a complicated area of sediment deposition. Unsaturated alkenones are synthesized by coccolithophores, which is a microorganism mainly living in ocean, and can be detected by GC-FID. In this study, alkenone concentrations in surface sediments retrieved from the Taiwan Strait are analyzed for understanding the spatial distribution. Based upon published data, it’s well-known that the distribution of total organic carbons (TOC) in Taiwan Strait is regulative by seasonal currents and concentrated in mud-belt. Our results reveal that the distribution of marine biogenic matters have great difference with terrestrial organic matters. Higher concentrations are found in Mainland China coastal region rather than Taiwan Island coastal zone. Highest values are observed along the coastal region off Fujian Province, China. As the results, alkenones have different distributive pattern with TOC. Otherwise, alkenones occupies merely little proportion in TOC, means that the distribution of organic matters in the Taiwan Strait are mainly dominated by terrestrial organic matters. This fact means that distributed alkenones are not only affected by grain size, the most important factors to effect alkenones distribution are landform and upwelling.

論文審定書……………………………………………………………………………i
誌謝……………………...……………………………………………………………ii
中文摘要……………………………………………………………………………...iii
英文摘要……………………………………………………………………………...iv
目錄……………………………………………………………………………..….…v
圖目錄……………………………………………………………………….……….vii
表目錄…………………………………….……………………………………….viii
第一章、 緒論………………………………………………………………………1
1.1前言…………..……………………………………………………............1
1.2研究區域背景……………………………………......................................1
1.2.1海底地形……………..…………………………...………...……...2
1.2.2水文流場….…………….….……………………..……………......3
1.3生物指標…………………………………………......................................4
1.3.1鈣板藻……….……………………………………………………..4
1.3.2正烷烴(n-alkane)..……………………................................................5
1.4研究動機…………………………………………...................................7
第二章、 材料與方法………………………………………………..……………..8
2.1實驗材料…………………………………………………………………..8
2.2實驗藥品及儀器…………………………………………………………..9
2.3實驗器材前處理…………………………………………………………10
2.4樣本前處理……………………………………………………………….11
2.5分析前處理………………………………………………………………12
2.6儀器分析方法……………………………………………………………15
第三章、 研究結果………………………………………………………………..16
3.1不飽和烯酮類濃度的空間分布…………………………………………16
3.2單位總有機碳中之不飽和烯酮類濃度的空間分布……………………18
3.3 C37:2與C37:3在臺灣海峽中的空間分布……………….…..…………...20
第四章、 討論……………………………………………………………………..22
4.1 TOC與不飽和烯酮類的關係…………………………………………....22
4.2 短碳鏈與不飽和烯酮類的關係….………………...………………...…24
4.3 海水參數……………………….………………………...……...………28
4.4光照、湧升流等其他因素……………………………….……………….30
第五章、 結論……………………………………………………………………..35
參考文獻…………………………………………………………..........................36
中文部分…………………………………………..…………………………36
英文部分………………………………………..……………………………36
附錄一、航次站位、檢測數據…….............................................…............................42

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