How is the El Nino phenomenon connected with the Southern Oscillation?

Solution -
The southern oscillation is atmospheric component of El nino. This component is an oscillation in surface air pressure between the tropical eastern and western Pacific Ocean.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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