El Nino-Southern Oscillation (ENSO) (In Revision)
El Nino-Southern Oscillation (ENSO) (In Revision) : An irregularly occurring pattern of abnormal warming of the surface coastal waters off Ecuador, Peru and Chile This coupled atmosphere-ocean phenomenon is associated with the fluctuation of inter-tropical surface pressure pattern and circulation in the Indian and Pacific oceans, called the Southern Oscillation. There have been a number of attempts to define El Nino, both quantitatively and qualitatively, but none has achieved universal recognition. This phenomenon triggers a shift in seasonal patterns of weather systems over many subtropical and mid-latitude parts of the globe. La Nina (in revision) is the opposite of an El Nino pattern, during which waters in the west Pacific are warmer than normal and trade winds are stronger
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