El Nino southern oscillation
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|Noun||1.||El Nino southern oscillation - a more intense El Nino that occurs every few years when the welling up of cold nutrient-rich water does not occur; kills plankton and fish and affects weather patterns|
El Nino - (oceanography) a warm ocean current that flows along the equator from the date line and south off the coast of Ecuador at Christmas time
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