本研究主要目標為內波對東沙海域葉綠素濃度分布之影響，分析應用的資料包括美國航空暨太空總署Aqua及Terra衛星上所搭載的中解析度成像分光輻射計 (Moderate-resolution Imaging Spectroradiometer, MODIS)之葉綠素濃度及海表溫資料，以及東沙各項實測海氣象資料，包括潮位、流速流向、溫度及風速風向等。探討東沙環礁附近海域氣海象因子對葉綠素濃度分布變化之影響。
研究結果顯示：（1）東沙海域之海表溫、葉綠素甲濃度均呈季節性變化，且溫度與葉綠素在冬天時有較佳的負相關，而夏天常有葉綠素濃度增加，推測為內波所造成冷水舉升及帶來營養鹽所導致。（2）夏季時葉綠素增加多發生於環礁東北海域，因內波在南海由東向西傳進之角度約為282度，當內波撞及東沙環礁時，受岸線及地形水深影響導致冷水在此區湧升。（3）衛星影像及CTD水文資料顯示，內波通過時將對葉綠素造成擾動，但內波通過後不見得會立即增加葉綠素濃度。

This thesis investigates the variation of the chlorophyll-a concentration near Dongsha Atoll derived from MODIS Aqua and Terra satellite images, and their relationship to physical environments including sea surface temperature, CTD water qualities, tides, currents and surface winds for the period 2005 to 2008.
The results revealed that the seasonal variation of chlorophyll-a concentration was higher in the winter than in the summer, and had inverse relationship with sea surface temperature. The increased chlorophyll-a concentration was due to entrainment of lower layer cold water with high nutrient. The upwelling water was induced by mixing of surface wind and internal wave shoaling. When the internal waves propagated westward to the Dongsha Atoll, the bottom topography and coastline oriented the cold deep water surged up slope to the northeastern corner of the Atoll, which produced high chlorophyll-a concentration a few days after. The comparison of MODIS images and CTD data revealed that the chlorophyll-a concentration didn’t increase immediately after the passage of internal waves.

中文摘要 i
英文摘要 ii
目錄 iii
圖目錄 vi
表目錄 ix
第一章、前言 1
1.1東沙環礁介紹 1
1.2 文獻回顧 5
1.3 研究目的 10
第二章、資料來源 12
2.1 MODIS衛星資料 12
2.1.1葉綠素濃度資料 14
2.1.2 海表面溫度資料 16
2.2.1底碇測站資料 17
2.2.2風速風向資料 18
2.2.3 CTD資料 18
第三章、資料品質管制與處理 20
3.1 衛星資料品管 20
3.1.1衛星葉綠素濃度品管 20
3.1.2葉綠素影像校正 24
3.2 水文資料品管 28
3.2.1 海流資料 28
3.2.2 CTD水溫及螢光資料 29
3.3 衛星資料分區統計 30
3.4水文資料分析方法 32
3.4.1調和分析 32
3.4.2濾波分析Lowpass 33
第四章、結果與討論 34
4.1各區葉綠素濃度統計 34
4.2葉綠素濃度季節性變化 36
4.3海氣象與葉綠素分布 51
4.3.1溫度與葉綠素之負相關 51
4.3.2 海流運輸及混和之影響 56
4.3.3 風及內波所引起混合作用 60
第五章、結論 62
第六章 參考文獻 64

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