研究生: |
許群 Chun Hsu |
---|---|
論文名稱: |
臺灣海峽海流的季節與年際變化 Seasonal and interannual variability of the Taiwan Strait current |
指導教授: |
吳朝榮
Wu, Chau-Ron |
學位類別: |
碩士 Master |
系所名稱: |
地球科學系 Department of Earth Sciences |
論文出版年: | 2006 |
畢業學年度: | 94 |
論文頁數: | 93 |
中文關鍵詞: | 臺灣海峽 、季節變化 、年際變化 、海洋數值模擬 |
英文關鍵詞: | Taiwan strait, seasonal, interannual, numerical modeling |
論文種類: | 學術論文 |
相關次數: | 點閱:256 下載:40 |
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摘要
本研究建構了一個高解析度的臺灣海峽模式,並利用此模式來研究海峽流場與溫度場之季節與年際變化。模式的初始條件及邊界條件是使用東亞邊緣海模式之輸出結果,水平的網格配置則使用正交曲線座標,模式解析度在海峽內部約3公里向外逐漸遞減至10公里。
臺灣海峽模式之輸出場與現有的觀測資料比對結果相當一致,可以重建臺灣海峽時空變化的特性。就季節變化而言,風向季節性的轉變對於臺灣海峽有顯著的影響;盛行西南季風的夏季時,海峽流場以北向海流為主,並在彰雲隆起一帶出現上下分層的流場結構。此外,在海峽西部及臺灣灘一帶,有湧升流所造成的低溫區出現。冬季時風場轉為東北風,隨風南下的低溫海水與經海峽凹陷地形北上的溫暖海水在烏坵凹陷一帶相遇,並在海峽北部與中部分別形成U型及順時鐘的環流型態;而溫度場則是呈現南暖北冷的分布狀況。另外,在東北風盛行的冬季,海峽流場對於東北增強事件,也會有相對應的反應歷程。
就年際變化而言,在2001 ~2003年間的夏季,臺灣海峽西南風場強度以2003年為最強,在此風場的帶動下,海峽西北方低溫區的範圍與強度呈現三年中最明顯的一次。在2002/2003 年ENSO發生的冬季,其東北風較正常年減弱,而使得海峽內部南向傳輸較正常年減弱,此時南向的冷水勢力退縮,而北上的暖水勢力增強,這兩股勢力的消長,因而讓海峽溫度場分布與正常年有所不同。整體而言,風場強度及風向之改變對於臺灣海峽流場與溫度場的變化型態有密切關係,流場與溫度場之季節或是年際變化都直接受到風場的影響。
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