臺灣博碩士論文加值系統

本論文主要探討台灣海峽低頻流場的變化，使用1999年至2001年間橫越台灣海峽的四組底碇式都卜勒流剖儀測得之資料，包含近乎涵蓋整個水層之海流剖面、以及近海床水溫資料，並以東吉島氣象站測得的風速資料，分析探討台灣海峽內風與低頻流場之間的關係。結果顯示台灣海峽內的低頻流場型態在西南季風時期、季風轉型時期、及東北季風時期於體積流量及流向存在明顯的差異，低頻海流變化與季風型態有明顯相關。於西南季風時期的低頻海流呈現上下一致且穩定的平行海峽走向東北流，以及偏向台灣的流向，靠台灣處水溫較其他地方高，溫度梯度出現在海峽東側，順沿海峽方向的體積流量至少有1.42±0.32 Sv以上（正值為北偏東30°）。當進入西南季風轉型至東北季風之時期，下層流場仍可保持與西南季風時期相同型態，但是上層流場型態已與西南季風時期不同，開始出現平行海峽走向的西南流以及偏向中國大陸的流向，上下層流向時而不一致，此時海峽內各處水溫沒有顯著差異，順沿海峽方向的體積流量明顯減少為0.73±1.09 Sv。進入東北季風時期之後，上層海流型態已延伸至下層海水，上下層流向再度呈現一致的現象，靠中國大陸處的水溫較其他地方低，溫度梯度轉而出現在海峽西側，風與流量的相關性亦隨著東北季風增強而趨高，可達0.89，此時順沿海峽方向的體積流量已經偏南，為–0.25±1.14 Sv。

致謝..........................................................................................i
目錄..........................................................................................iii
圖目錄.......................................................................................iv
表目錄.......................................................................................v
摘要..........................................................................................viii
第一章 緒論..........................................................................1-1
第二章 觀測資料....................................................................2-1
第三章 分析與結果.................................................................3-1
3-1 研究方法.........................................................................3-1
3-2 台灣海峽內低頻海流剖面...................................................3-1
3-3 台灣海峽內低頻海流在不同季風時期的流場特性....................3-14
3-4 不同季風時期的順沿海峽方向體積流量................................3-25
第四章 討論與結論.................................................................4-1
參考文獻....................................................................................5-1

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