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Q5.) what is mean by southern oscillation. state an important features of it.

Southern Oscillation refers to the shifting of the surface air pressure between the tropical eastern Pacific and eastern Indian Ocean. The eastern Pacific Ocean experiences high pressure when the Indian Ocean experiences low pressure. During certain years, the pressure conditions are reversed and the Indian Ocean has a higher pressure in comparison to the Indian Ocean. This phenomenon is known as the Southern Oscillation. The Index of Southern Oscillation is computed from fluctuations in the surface air pressure between Tahiti and Darwin.

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The periodic change in pressure conditions is known as southern oscillations . An important feature connected with southern oscillation is el nino,a warm ocean current that flows past the Peruvian coast, in place of the cold Peruvian current,every 2-5 years. The changes in pressure conditions are connected to the el nino. Hence, the phenomenon is referred to as ENSO (el nino southern oscillation. :-)
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