Page "Quasi-biennial oscillation" Paragraph 0
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The quasi-biennial oscillation ( QBO ) is a quasi-periodic oscillation of the equatorial zonal wind between easterlies and westerlies in the tropical stratosphere with a mean period of 28 to 29 months.
The alternating wind regimes develop at the top of the lower stratosphere and propagate downwards at about per month until they are dissipated at the tropical tropopause.
At the top of the vertical QBO domain, easterlies dominate, while at the bottom, westerlies are more likely to be found.
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