It is necessary for the undercurrent to strongen in the western Pacific Ocean and for the sea surface current to weaken in the eastern Pacific Ocean.

赤道西太平洋潜流和东太平洋南赤道流减弱是产生厄尔尼诺的必要条件。

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Results were shown that, subsurface water mostly comes from the North Pacific while the intermediate water originates from both the North and South Pacific Ocean, even possibly from the Indian Ocean.

分析结果表明，ITF的次表层水源主要来自北太平洋，中层水源地既包括北太平洋、南太平洋，同时也不能排除有印度洋的可能性。

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Results were shown that, subsurface water mostly comes from the North Pacific while the intermediate water originates from both the North and South Pacific Ocean, even possibly from the Indian Ocean.

分析结果表明，ITF的次表层水源主要来自北太平洋，中层水源地既包括北太平洋、南太平洋，同时也不能排除有印度洋的可能性。

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