EI-nina And La-nina

Abstract

El Nino is an extensive warming of the upper ocean in the tropical Pacific lasting three or more seasons. The Southern Oscillation is a widespread inter-annual oscillation in sea-level atmospheric pressure between one region near northern Australia and one in the central Pacific.
La Nina is sometimes referred to as the cold phase of ENSO and El Nino as the warm phase of ENSO These deviations from normal surface temperatures can have large-scale impacts not only on ocean processes, but also on global weather and climate. An ENSO event takes place every 3 to 7 years, and may last for Just for to18 months. The impact can be worldwide.