Question

Define southern oscillations briefly

Answer 1

Southern Oscillation. climatology. : a periodic seesaw fluctuation in sea-level atmospheric pressures over the southern Pacific and Indian oceans that is believed to be linked to El Niño and La Niña events — compare arctic oscillation, north atlantic oscillation.
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Answer 2

El Niño–Southern Oscillation (ENSO) is an irregularly periodic variation in winds and sea surface temperatures over the tropical eastern Pacific Ocean, affecting the climate of much of the tropics and subtropics. The warming phase of the sea temperature is known as El Niño and the cooling phase as La Niña. The Southern Oscillation is the accompanying atmospheric component, coupled with the sea temperature change: El Niño is accompanied by high air surface pressure in the tropical western Pacific and La Niña with low air surface pressure there.[1][2] The two periods last several months each (typically occurring every few years) and their effects vary in intensity.