研究生: |
王儷樵 Li-Chiao Wang |
---|---|
論文名稱: |
太平洋赤道洋流系統之研究 The flow pattern in the equatorial Pacific Ocean |
指導教授: |
吳朝榮
Wu, Chau-Ron 陳正達 Chen, Cheng-Ta |
學位類別: |
碩士 Master |
系所名稱: |
海洋環境科技研究所 Graduate Institute of Marine Environmental Science and Technology |
論文出版年: | 2009 |
畢業學年度: | 97 |
語文別: | 中文 |
論文頁數: | 97 |
中文關鍵詞: | 赤道 、太平洋 |
英文關鍵詞: | equatorial, Pacific Ocean |
論文種類: | 學術論文 |
相關次數: | 點閱:219 下載:28 |
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太平洋(Pacific Ocean)赤道地區(140°E~80°W,20°N~20°S),主要的洋流包括:由東向西流的北赤道洋流(North Equatorial Current, NEC)、南赤道洋流(South Equatorial Current, SEC),以及由西向東流的北赤道反流(North Equatorial Countercurrent, NEC)、赤道潛流(Equatorial undercurrent, EUC)。這些洋流主要生成機制和風力、柯氏力及壓力梯度力和有關。
本論文使用GODAS(Global Ocean Data Assimilation System)模式1988~2007年的月平均資料,來研究赤道太平洋的主要洋流在正常年、聖嬰年及反聖嬰年夏冬兩季的流況變化。由模式結果我們發現,夏季時NECC與SECn緯度位置相近,因此遇上SECn後有分支北移的現象,NECC分支點的位置在聖嬰年偏東,正常年次之,反聖嬰年偏西。冬季時NECC比SECn要偏北,因此不會和SECn相遇。另外,正常年冬季出現於SECs南邊的SECC,在反聖嬰年冬季流速增強,到了聖嬰年冬季時則消失不見。
不論是正常年、聖嬰年或反聖嬰年的夏季,NEC自90°W有NECC往北匯入,流至110°W又往回匯入NECC,因此在90°W~110°W之間形成一個環流(Costa Rika Dome)。到了冬季,NEC在110°W沒有往回匯入NECC的現象,故冬季時此環流並不存在。
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