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    Question ID:   13226         Current Version: 1
Question: Why does El Nino occur?
Category: Science > Weather
Keywords: cause, occur, happen, El Nino
Type: why
Rating:(0 ratings)    Views: 307    Discussions: 0   In Watch Lists: 1  

 
    Answer:

El Niño results from interaction between the surface layers of the ocean and the overlying atmosphere in tropical Pacific. It is the internal dynamics of the coupled ocean-atmosphere system that determine the onset and termination of El Niño events. The physical processes are complicated, but they involve unstable air-sea interaction and planetary scale oceanic waves. The system oscillates between warm (El Niño) to neutral (or cold) conditions with a natural periodicity of roughly 3-4 years. External forcing from volcanic eruptions (submarine or terrestial) have no connnection with El Niño. Nor do sunspots as far as we know.

Source: NOAA

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