中文摘要
本論文之研究乃著眼於分析南海海水氧同位素組成變化與混合層深度之關係。海水氧同位素組成分析係利用CO2-H2O同位素平衡法；分析結果其數值之精確度達+0.1‰。分析結果顯示：海水平均氧同位素值（d18OSMOW）深度變化情形為：表層（0-100公尺）約為0.02‰；次表層（100-400公尺）約為0.2‰；中層（400-1500公尺）約為-0.03‰；底層（>1500公尺）則約為-0.06‰。南海混合層深化之時段正值冬季且為東北季風盛行之時，因此，此種混合層之加厚，應與季風息息相關；而海水氧同位素值與混合層深度間具一良好線性關係；換言之，即當海水氧同位素值（d18OSMOW）較輕時，其混合層深度呈現出淺化之情形；而當海水氧同位素值（d18OSMOW）較重時，其混合層深度則呈現出深化之情形。

Abstract
This study focuses on analyzing depth distributions of d18O and changes in mixed layer thickness in the South China Sea (SCS). The oxygen isotopic compositions of the samples collected were determined using the Epstein-Mayeda (1953). The overall precision of the d18OSMOW measurements is +0.1‰. Our data suggest that depth changes of average d18OSMOW of seawater in the SCS as follows: the average d18OSMOW values for the surface (0-100m) is 0.02‰; subsurface (100-400m) is 0.2‰; intermediate (400-1500m) is –0.03‰ and deep waters (>1500m) is –0.06‰. The effect of monsoon on the mixed layer in the SCS water is evident as the increases in the mixed layer is always coincident with the northeast monsoon in winter. Furthermore, the d18OSMOW values are correlated linearly with the mixed layer thickness. In other words, the lower d18OSMOW values of seawater are, the less the thickness of mixed layer is.

目錄
誌謝……………………………………………………………………..Ⅰ
中文摘要……………………………………………………………….Ⅲ
英文摘要……………………………………………………………….Ⅳ
目錄…………………………………………………………………….Ⅴ
圖目錄………………………………………………………………….Ⅶ
表目錄………………………………………………………………….Ⅹ
壹、 前言………………………………………………………………1
一、 研究目的…………………………………………………….1
二、 研究背景…………………………………………………….2
三、 海水氧同位素組成變化之控制因素……………………….6
貳、研究方法…………………………………………………………..8
一、 測站位置及採樣方法………………………………………8
二、 實驗分析方法…………………………………………….10
三、 海水氧同位素值之校正…………………………………..11
參、實驗分析結果……………………………………………………14
一、水文資料之描述……………………………………………14
二、海水氧同位素組成分析結果………………………………27
肆、討論………………………………………………………………37
一、海水氧同位素值之變化……………………………………37.
二、雨水氧同位素值之變化……………………………………44
三、混合層深淺狀態之探討……………………………………45
四、海水氧同位素值與混合層深度之關係……………………51
五、南海表層水氧同位素值影響因子之探討…………………51
伍、結論………………………………………………………………56
陸、參考文獻…………………………………………………………58
一、 中文參考文獻…………………………………………….58
二、 英文參考文獻…………………………………………….58
附錄一、各航次水文資料及海水氧同位素值………………………61
附錄二、海水氧同位素參考工作標本分析值及其精確度…………72
附錄三、典型西菲律賓海水之水文資料及海水氧同位素值………74
附錄四、典型南海海水之水文資料及海水氧同位素值……………75
附錄五、各航次混合層深度一覽表…………………………………76

陸、參考文獻
一、 中文參考文獻
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王麗雯，1997，南海東北部溶解態無機碳碳同位素的變化，國立中山大學碩士論文，共124頁。
林士超，1999，東海海水氧同位素之研究，國立中山大學碩士論文，共145頁。
詹智丞，1999，南海大尺度風場與上層海洋熱含量之探討，國立臺灣大學海洋研究所碩士論文，共75頁
林清芬，2000，南海及呂宋海峽海水氧同位素組成之研究，國立中山大學碩士論文，共80頁。
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