摘要
本研究分析之樣品，係取自於台灣東北部蘭陽溪口外海，由T12、T13、T18三串沉積物收集器所取得之沉降顆粒。分析有機碳碳同位素（d13Corg）、總有機碳含量（TOC）與碳氮比（C/N Ratio），再配合已知的質量通量（Mass Flux）資料，以探討東海陸棚及陸坡顆粒之來源與傳輸過程及其隨時空變化之趨勢。研究結果顯示：在碳同位素方面，d13Corg值介於-21~-25 o/oo之間，為典型陸棚沉積物。T12站之d13Corg平均值較T13站輕，顯示T12受陸源影響較大。在空間分佈方面，d13C的值隨著深度變深而有變輕的趨勢。由於顆粒來源除了從現場（in situ）產生的顆粒外（d13Corg值較重），還有側向傳輸的顆粒（d13Corg值較輕），而分析的d13Corg值則為兩者混合的結果，且可能為下層截收到側向傳輸的量較上層多。就時間分佈而言，d13Corg亦會受月份改變而有所變化。因此除了現場的生物作用所造成的顆粒外，有機碳含量介於0.5wt%~1.5wt%，且含量由上往下遞減。推測TOC值的高低，除了受表層生產力影響外，還受側向傳輸顆粒及有機保存度的影響。不同水深對顆粒的傳輸能力亦不同，也會造成台灣東北海域沉積顆粒其地球化學特性和碳同位素值的差異。

Abstract

This study is to investigate the spatial and temporal variabilities of geochemical and carbon isotopic compositions of particles collected in the region off northeast Taiwan. Organic carbon isotopic compositions (d13Corg), total organic carbon content (TOC) and C/N ratio were determined in sediment particles collected at different water depths from three time-series sediment traps (at T12, T13, and T18 stations, respectively). The results showed abnormally high mass fluxes than those previously found. Generally they increase with water depths, implying both the transport from Lanyang-Hsi River and the resuspension from the seafloor. TOC contents range from 0.5 to 1.5wt% and decrease with depths. This can be attributed to changes in the surface productivity, lateral transport and organic preservation. The organic carbon isotopic compositions range between -21 and -25o/oo, which falls well within the d13Corg values of continental margin sediments. The lower d13Corg values at T12 station than those at T13 station can be attributed to the large terrestrial inputs. It is noted that d13Corg values decrease with depths, suggesting a significant contribution of the horizontal transport of particles to the settling process.

壹 前言
1-1研究背景…………………………………………………….1
1-2研究區域水文……………………………………………….5
1-3研究區域之顆粒通量……………………………………….7
1-4 研究目的…………………………………………………...13
貳 材料與分析方法
2-1.1研究材料………………………………………………….14
2-1.2錨碇情況………………………………………………….14
2.2樣品前處理…………………………………………………17
2-3.1二氧化碳氣體純化及收集……………………………….18
2-3.2二氧化碳氣體量與壓力值之探討……………………….21
2-3.3控制樣品………………………………………………….23
2-4.1總碳（TC wt %）及總氮（TN wt %）之測定…………24
2-4.2有機碳（TOC wt %）及無機碳（TIC wt %）分析……24
參 結果
3-1 有機碳同位素組成變化…………………………………..26
3-2 顆粒性有機碳（TOC wt %）含量與通量………………31
3-3 顆粒性無機碳（TIC wt %）含量………………………..35
3-4 有機碳氮比值（OC/N atomic Ratio）…………………..37
肆 討論
4-1側向傳輸之重要性…………………………………………..39
4-2探討碳同位素之組成變化…………………………………..41
4-3 d13C與顆粒通量的關係……………………………………..42
4-4 二元混合模式……………………………………………….45
4-5與前人相較…………………………………………………..47
伍 討論………………………………………………………………49
參考文獻
中文部份…………………………………………………………51
英文部份…………………………………………………………52

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