QBO: Quasi-Biennial Oscillation

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QBO: Quasi-Biennial Oscillation
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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 1 km (0.6 mi) per month until they are dissipated at the tropical tropopause. Downward motion of the easterlies is usually more irregular than that of the westerlies. The amplitude of the easterly phase is about twice as strong as that of the westerly phase. At the top of the vertical QBO domain, easterlies dominate, while at the bottom, westerlies are more likely to be found. (Wikipedia)

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Key Figures

Climate Data Guide Image: QBO

QBO for 1953-2012. Data source (Freie Universitat, Berlin)

Other Information

Earth system components and main variables
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Years of record
to
Data time period extended
Yes, data set is extended
Timestep
Monthly
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Missing data present
Ocean or Land
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Key Publications
  1. Naujokat, B., 1986: An update of the observed quasi-biennial oscillation of the stratospheric winds over the tropics. J. Atmos. Sci., 43, 1873-1877.
  2. Baldwin, M.P. et al, 2001: The Quasi-Biennial Oscillation. Reviews of Geophys., 39, 179-229.
  3. Andrews, D.G., J.R. Holton, and C.B. Leovy, 1987: Middle Atmosphere Dynamics. Academic Press, 489pp