南海內波可依週期的不同，分為包括潮汐週期的內潮以及10~20分鐘的非線性內波，內波在溫躍層振幅可達100公尺以上。在孤立內波前緣會有輻合帶，反應在海面的是500公尺至1000公尺寬的粗糙表面，可由太空中之衛星偵測到。
本研究主要希望藉由內波經過時所造成的海表面高度的變化，並使用衛星高度計資料解析東沙環礁海域之內波訊號，資料期間為2002年8月至2005年10月每十天一筆的觀測，分析應用的方法包括（1）變異量分析，（2）調和分析迴歸分潮週期的Aliasing period以及（3）利用波數頻譜分析計算波長75~250公里之中尺度運動現象等，探討衛星高度計資料是否能真實呈現內波經過時所造成的變化。
研究結果顯示：（1）海面高度有季節性的變異量變化，即一年週期之擺動，為水團熱漲冷縮所造成的海表面高度變化。（2）調和分析內波在海表面振幅僅數公分，因為內波以非線性傳遞，以迴歸分析之線性疊加方法有其不足。（3）波數頻譜分析顯示在研究區域內，內波能量與波數譜之比值(斜率)絕對值約在2~3之間，代表有大於100公里尺度之頻繁波動。

Internal waves include soliton of period 10-20 minutes and tidal frequency waves. Large internal solitons with amplitude over 100 m were observed frequently in the South China Sea (SCS). There were convergence zones of 500-1000 m wide in the wave front of solitons which can be detected by satellite from the space.
The hypothesis of this study is the internal wave signal can be extracted from the sea surface anomalies of satellite altimetry. Data analyzed include TOPEX/Poseidon altimeter from August 2002 to October 2005 in the northern SCS and Kuroshio regions. Methods applied include (1) standard deviation analysis, (2) harmonic analysis and (3) wavenumber spectrum analysis.
The results show that（1）there is an annual variation in the sea surface height, which is explained due to water temperature changes in different seasons. (2) The results of harmonic analysis show that the amplitude of M2 aliasing is only a few centimeters on the sea surface. The different is small between internal active region and that of without. (3) The absolute values of slope, of internal wave energy and wavenumber spectrum, are 2-3 in the wave active region. This suggests that there are wave motions of scale 100 km or larger, which matches with the length scale of internal waves in the northern SCS.

摘要 I
Abstract II
目錄 IV
圖目錄 VI
表目錄 XI
第一章 緒論 1
1.1前言 1
1.2研究區域介紹 2
1.3文獻回顧 4
1.4研究目的 9
第二章 資料來源 10
2.1衛星高度計資料 10
2.2 MODIS影像資料 14
第三章 資料品管與分析處理 15
3.1衛星高度計資料品管處理 16
3.2調和分析 18
3.3 Aliases period 19
3.4波數頻譜（wavenumber spectrum） 20
第四章 結果與討論 24
4.1高度計資料之內容 24
4.2月份變異量統計 37
4.3調和分析年週期及M2分潮週期 45
4.4波數頻譜（wavenumber spectrum） 49
第五章 結論 62
第六章 參考文獻 64

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