Brunt-Väisälä frequency

The frequency N at which a displaced air parcel will oscillate when displaced vertically within a statically stable environment.
It is given as

where g = 9.8 m s^-1 is gravitational acceleration, θ_υa is the ambient virtual potential temperature, and ∂θ_υa/∂z is the vertical gradient of the ambient virtual potential temperature. Units are radians per second, although this is usually abbreviated as s^-1. This frequency is not defined in statically unstable air and is zero in statically neutral air. The frequency of internal gravity waves in the atmosphere cannot exceed the local Brunt–Väisälä frequency. This frequency is also sometimes used as a measure of the stability within a statically stable environment.

See also buoyancy frequency.
Reference:Stull, R. B. 1995. Meteorology Today for Scientists and Engineers. 385 pp.

term edited 15 Dec 2014

frecuencia de Brunt–Väisälä

Es la frecuencia N a la que una parcela de aire desplazada oscilará cuando se desplaza verticalmente dentro de un ambiente estable estáticamente.

Descrita por

donde g = 9.8 m s^-1 es la aceleración gravitacional, Tv es la temperatura virtual absoluta promedio y ∂θv/∂z es el gradiente vertical de la temperatura potencial virtual. Las unidades están en radianes por segundo, aunque por lo general, se abrevian como s-1. Esta frecuencia no se define en el aire estáticamente inestable y es cero en el aire estáticamente neutro. La frecuencia de las ondas gravitacionales internas en la atmósfera no puede exceder la frecuencia de Brunt-Väisälä local. Algunas veces se usa esta frecuencia como una medida de la estabilidad dentro de un entorno estáticamente estable.

Consulte frecuencia de empuje hidrostático.

1. The study of the physics, chemistry, and dynamics of the earth's atmosphere, including the related effects at the air–earth boundary over both land and the oceans. Fundamental topics include the composition, structure, and motion of the atmosphere. The goals ascribed to meteorology are the complete understanding and accurate prediction of atmospheric phenomena.