An atmospheric waveguide is an atmospheric
flowfeature that improves the propagation of certain atmospheric waves.
The effect arises because wave parameters such as
group velocityor vertical wavenumberdepend on mean flowdirection and strength. Thus, for instance, westerlies might be a good waveguidefor eastward-traveling waves, but might strongly dissipate westward-traveling waves, by increasing or decreasing their vertical wavenumber, respectively. Modification of the waves' group velocitywill change their meridionalpropagation speed, directing them more polewards or more equatorwards.
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