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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