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southern oscillation

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noun
  1. a low-latitude fluctuation of atmospheric pressure closely linked with El Niño events, specifically the periods of El Niño warming and La Niña cooling.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
southern oscillation in Science

southern oscillation

  1. The cyclic variation of atmospheric pressure at sea level between the eastern and western regions of the southern Pacific Ocean as a result of the periodic cooling and warming of surface water known as La Niña and El Niño. It has an average period of 2.33 years.
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