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Brunt-Väisälä frequency

(buoyancy frequency)
(natural frequency of buoyancy waves)

The Brunt-Väisälä frequency (or buoyancy frequency) is a characteristic frequency of buoyancy waves in a stratified fluid, specifically the frequency of the oscillation caused by a vertical displacement of a parcel of fluid within a still body of fluid whose density varies with depth, lying stably within a gravitational field. The concept is used in meteorology and other sciences and applies to stars and planet atmospheres. It is defined as:

N² = -(G/ρ0) ∂ρ/∂z

(atmosphere,fluid dynamics)
http://en.wikipedia.org/wiki/Brunt-Vaisala_frequency

Referenced by:
zonal flow

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