el nino southern oscillation

Noun
  1. 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 (synset 111509228)
    is a type of: 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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