What does El Nino southern oscillation mean?
• EL NINO SOUTHERN OSCILLATION (noun) The noun EL NINO SOUTHERN OSCILLATION has 1 sense: 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 Familiarity information: EL NINO SOUTHERN OSCILLATION used as a noun is very rare.