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| | | #REDIRECT: [[Perturbation]] |
| #REDIRECT [[perturbation]] | |
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| == perturbation ==
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| <div class="definition"><div class="short_definition">Any departure introduced into an assumed [[steady state]] of a system.</div><br/> <div class="paragraph">The magnitude is often assumed to be small so that product terms in the [[dependent variables]] may be neglected; the term "perturbation" is therefore sometimes used as synonymous with "small perturbation." The perturbation may be concentrated at a point or in a finite volume of space; it may be a [[wave]] (sine or cosine function); in the case of a rotating system, it may be symmetric about the axis of rotation; or it may be a displacement by the [[parcel method]]. The mathematical work in an [[instability]] problem may be facilitated by the [[perturbation technique]], whether or not the equations are linearized. In [[synoptic meteorology]], this term is used for any departure from [[zonal flow]] within the major [[zonal]] currents of the [[atmosphere]]. It is especially applied to the wavelike disturbances within the [[tropical easterlies]]. <br/>''See'' [[easterly wave]]; <br/>''compare'' [[disturbance]].</div><br/> </div>
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