Brunt-väisälä frequency: Difference between revisions

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{{DISPLAYTITLE:Brunt-Väisälä frequency}}




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  The [[frequency]] ''N'' at which a displaced [[air parcel]] will oscillate when  displaced vertically within a [[static stability|statically stable]] environment.<br/> It is given as    <blockquote>[[File:Brunt_V_final.png‎|170px|center]]</blockquote>    where ''g'' = 9.8 m s<sup>-1</sup> is gravitational [[acceleration]], ''&#x003b8;''<sub>''&#965;a''</sub> is the ambient virtual potential temperature, and &part;''&#x003b8;''<sub>''&#965;a''</sub>/&part;''z'' is the vertical [[gradient]] of the ambient [[virtual potential temperature]]. Units are radians per second,  although this is usually abbreviated as s<sup>-1</sup>. 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&ndash;V&#x000e4;is&#x000e4;l&#x000e4; frequency. This frequency is also sometimes used as a measure  of the [[stability]] within a statically stable environment.<br/>
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<br/>''See also'' [[buoyancy frequency]].<br/>Reference:Stull, R. B. 1995. Meteorology Today for Scientists and Engineers. 385 pp. <br/>


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== Brunt&ndash;V&#x000e4;is&#x000e4;l&#x000e4; frequency ==
 


<div class="definition"><div class="short_definition">The [[frequency]] ''N'' at which a displaced [[air parcel]] will oscillate when  displaced vertically within a [[static stability|statically stable]] environment.</div><br/> <div class="paragraph">It is given as    <div class="display-formula"><blockquote>[[File:Brunt_V_final.png‎|150px|center]]</blockquote></div>    where ''g'' = 9.8 m s<sup>&#8211;1</sup> is gravitational [[acceleration]], ''&#x003b8;''<sub>''&#965;a''</sub> is the ambient virtual potential temperature, and &part;''&#x003b8;''<sub>''&#965;a''</sub>/&part;''z'' is the vertical [[gradient]] of the ambient [[virtual potential temperature]]. Units are radians per second,  although this is usually abbreviated as s<sup>&#8211;1</sup>. 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&ndash;V&#x000e4;is&#x000e4;l&#x000e4; frequency. This frequency is also sometimes used as a measure  of the [[stability]] within a statically stable environment.</div><br/> </div>
''term edited 15 Dec 2014''
<div class="definition"><div class="short_definition"><br/>''See also'' [[buoyancy frequency]].</div><br/>Reference:</div><div class="reference">Stull, R. B. 1995. Meteorology Today for Scientists and Engineers. 385 pp. </div><br/>


== 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.


''term edited 15 Dec 2014''
Descrita por  <blockquote>[[File:Brunt_V_final.png‎|170px|center]]</blockquote>
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donde ''g'' = 9.8 m s<sup>-1</sup> es la aceleración gravitacional, ''Tv'' es la temperatura virtual absoluta promedio y ∂θ''v''/∂''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.


[[Category:Terms_B]]
''Consulte'' frecuencia de empuje hidrostático.

Latest revision as of 09:32, 19 April 2024


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

Brunt V final.png

where g = 9.8 m s-1 is gravitational acceleration, θυa is the ambient virtual potential temperature, and ∂θυa/∂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[edit | edit source]

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

Brunt V final.png

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.

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