El Niño- the large-scale ocean-atmosphere climate interaction.

The term El Niño refers to the large-scale ocean-atmosphere climate interaction linked to a periodic warming in sea surface temperatures across the central and east-central Equatorial Pacific, as opposed to La Niña, which is characterized by unusually cold ocean temperatures in the Equatorial Pacific. El Niño is an oscillation of the ocean-atmosphere system in the tropical Pacific having important consequences for weather around the globe. In normal, non-El Niño conditions the trade winds blow to the west along the equator from South America towards Asia in the tropical Pacific Ocean.