Southern oscillation refers to shifting the surface air pressure between the tropical eastern Pacific and eastern Indian oceans.
An important feature connected with the Southern Oscillation (SO) is the El Nino.
A warm ocean current flows past the Peruvian coast, in place of the cold Peruvian current for every 2 to 5 years. The changes in pressure conditions are connected to the El Nino. Hence, the phenomenon is referred to as ENSO (El Nino Southern Oscillations).
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