Difference between revisions of "Beta drift"

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<div class="definition"><div class="short_definition">The [[drift]] of a [[tropical cyclone]] through the large-scale average layer-mean background  [[wind]] in which it is embedded.</div><br/> <div class="paragraph">The drift is caused by the [[advection]] of the background [[potential vorticity]] field by the [[storm]]  circulation. In the simplest case, the background potential vorticity gradient is simply the [[meridional]]  gradient of the [[Coriolis parameter]], &#x003b2;, from which the term gets its name. Beta drift generally  causes tropical cyclones to move poleward and westward relative to the motion they would have  if the background potential vorticity field were unperturbed by the storms. This drift speed is  generally around 1&ndash;2 m s<sup>&minus;1</sup>.</div><br/> </div>
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<div class="definition"><div class="short_definition">The [[drift]] of a [[tropical cyclone]] through the large-scale average layer-mean background  [[wind]] in which it is embedded.</div><br/> <div class="paragraph">The drift is caused by the [[advection]] of the background [[potential vorticity]] field by the [[storm]]  circulation. In the simplest case, the background potential vorticity gradient is simply the [[meridional]]  gradient of the [[Coriolis parameter]], &#x003b2;, from which the term gets its name. Beta drift generally  causes tropical cyclones to move poleward and westward relative to the motion they would have  if the background potential vorticity field were unperturbed by the storms. This drift speed is  generally around 1&ndash;2 m s<sup>-1</sup>.</div><br/> </div>
 
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Latest revision as of 13:44, 20 February 2012



beta drift

The drift of a tropical cyclone through the large-scale average layer-mean background wind in which it is embedded.

The drift is caused by the advection of the background potential vorticity field by the storm circulation. In the simplest case, the background potential vorticity gradient is simply the meridional gradient of the Coriolis parameter, β, from which the term gets its name. Beta drift generally causes tropical cyclones to move poleward and westward relative to the motion they would have if the background potential vorticity field were unperturbed by the storms. This drift speed is generally around 1–2 m s-1.