The Southern Oscillation is an interannual alternation of atmospheric pressure over the tropical Indo-Pacific region, and it is the atmospheric component of the El Niño-Southern Oscillation (ENSO). Shifts in these phases of atmospheric pressure occur at roughly three-to-eight-year intervals. Each phase is determined using the Southern Oscillation Index (SOI), which compares atmospheric pressure differences over Australia and Indonesia with those over the eastern South Pacific Ocean.
verifiedCite
While every effort has been made to follow citation style rules, there may be some discrepancies.
Please refer to the appropriate style manual or other sources if you have any questions.
Select Citation Style