臺灣博碩士論文加值系統

南中國海(South China Sea, SCS)是一個位於台灣西南方半封閉的邊緣海域，並且是一個渦旋活躍區，因此渦旋在該海域扮演了傳輸熱與物質的重要角色。當氣旋渦(cyclonic eddies, CE)在北半球產生時，渦旋的中心會因為逆時針的旋轉造成海水水平方向的輻散，因而產生垂直的湧升運動，而反氣旋渦(anticyclonic eddies, AE)則與之相反。但是，我們在SCS北部(Northern SCS, NSCS)的長期溫度剖面測線(PX44)上並沒有觀測到渦旋的中心有相同的結果。因此本研究主要是利用拋棄式溫度計(Expendable bathythermograph, XBT)和自計式溫鹽剖面浮標(Argo水文浮標)的垂直剖面資料，搭配衛星高度計資料，去探討NSCS的渦旋中心發生明顯的湧升與沉降之條件。透過研究分析發現，當有冷水進入NSCS時，區域性的海水分層減弱，使得渦旋中心發生較明顯的垂直沉降或是湧升現象。

The South China Sea (SCS) is a semi-enclosed marginal sea, where is an eddy-active zone. Eddies play an important role in transporting heat and matters in the ocean. When a cyclonic eddy is generated, upwelling will occur at its center, but the situation is reversed for an anticyclonic eddy. Previously, satellite altimeters were often used to track eddies, and the upwelling and downwelling at eddy centers could be observed through satellite-measured sea surface temperature. However, we found that no significant upwelling or downwelling at some eddy centers in Northern South China Sea (NSCS), based on the Expendable-bathythermograph (XBT) routine surveys. Thus, the main purpose of this study is to find out the marine environments that are favorable for the upwelling or downwelling to occur at the eddy centers in the NSCS, by using in-situ and satellite observations. Our finding showed that when cold waters transported into the NSCS, the local ocean stratification became weaker, making significant upwelling and downwelling at the eddy centers.

誌謝 I
摘要 II
Abstract III
目錄 IV
圖目錄 V
表目錄 VIII
第一章 緒論 1
1.1 前人文獻 1
1.2 研究動機與目的 2
第二章 資料來源 4
2.1 衛星資料 4
2.2 實測水文資料 4
2.3 水文平均資料 5
第三章 研究方法 6
3.1 渦旋的定義 6
3.2 海水分層強弱的計算 6
3.3 XBT鹽度重建方法 7
第四章 結果與討論 9
4.1 反氣旋渦的垂直結構 9
4.1.1 有明顯垂直沉降的反氣旋渦(三個案例) 9
4.1.2 無明顯垂直沉降的反氣旋渦(三個案例) 11
4.2 氣旋渦的垂直結構 12
4.2.1 有明顯垂直湧升的氣旋渦(兩個案例) 12
4.2.2 無明顯垂直湧升的氣旋渦(四個案例) 13
第五章 總結 15
5.1 結論 15
5.2 未來展望 15
參考文獻 17

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