Quasi-biennial oscillation

From Glossary of Meteorology
Revision as of 17:47, 26 January 2012 by imported>Perlwikibot (Created page with " {{TermHeader}} {{TermSearch}} <div class="termentry"> <div class="term"> == quasi-biennial oscillation == </div> <div class="definition"><div class="short_definition">...")
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

quasi-biennial oscillation

An oscillation in the zonal winds of the equatorial stratosphere having a period that fluctuates between about 24 and 30 months.

This oscillation is a manifestation of a downward propagation of winds with alternating sign. This phenomenon is sometimes referred to as the stratospheric quasi-biennial oscillation to distinguish it from other atmospheric features that also have spectral peaks near two years.