Definition of 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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“Southern Oscillation.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Southern%20Oscillation. Accessed 17 Sep. 2021.
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The first known use of Southern Oscillation was in 1923
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