A cool-water anomaly known as La Niña occupied the tropical Pacific Ocean throughout 2007 and early 2008. In April 2008, scientists at NASA's Jet Propulsion Laboratory announced that while the La Niña was weakening, the Pacific Decadal Oscillation - a larger-scale, slower-cycling ocean pattern - had shifted to its cool phase.
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©NASA
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La Nina and Pacific Decadal Oscillation Cool the Pacific
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