Difference between revisions of "Absolute instability"

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#<div class="definition"><div class="short_definition">The state of a column of air in the [[atmosphere]] when it has a [[superadiabatic  lapse rate]] of [[temperature]] (i.e., greater than the [[dry-adiabatic lapse rate]]).</div><br/> <div class="paragraph">An [[air parcel]] displaced vertically would be accelerated in the direction of the displacement.  The [[kinetic energy]] of the parcel would consequently increase with increasing distance from its  level of origin. <br/>''See'' [[parcel method]], [[conditional instability]], [[absolute stability]].</div><br/> </div>
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#<div class="definition"><div class="short_definition">The state of a column of air in the [[atmosphere]] when it has a [[superadiabatic lapse rate|superadiabatic  lapse rate]] of [[temperature]] (i.e., greater than the [[dry-adiabatic lapse rate]]).</div><br/> <div class="paragraph">An [[air parcel]] displaced vertically would be accelerated in the direction of the displacement.  The [[kinetic energy]] of the parcel would consequently increase with increasing distance from its  level of origin. <br/>''See'' [[parcel method]], [[conditional instability]], [[absolute stability]].</div><br/> </div>
#<div class="definition"><div class="short_definition">(<br/>''Also called'' [[mechanical instability]].) The state of a column of air in the [[atmosphere]] when  its [[lapse rate]] of [[temperature]] is greater than the [[autoconvective lapse rate]].</div><br/> <div class="paragraph">In such a column the air density would increase with [[elevation]]. <br/>''See also'' [[autoconvection]].</div><br/> </div>
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#<div class="definition"><div class="short_definition">(''Also called'' [[mechanical instability]].) The state of a column of air in the [[atmosphere]] when  its [[lapse rate]] of [[temperature]] is greater than the [[autoconvective lapse rate]].</div><br/> <div class="paragraph">In such a column the air density would increase with [[elevation]]. <br/>''See also'' [[autoconvection]].</div><br/> </div>
 
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Latest revision as of 16:18, 25 April 2012



absolute instability

  1. The state of a column of air in the atmosphere when it has a superadiabatic lapse rate of temperature (i.e., greater than the dry-adiabatic lapse rate).

    An air parcel displaced vertically would be accelerated in the direction of the displacement. The kinetic energy of the parcel would consequently increase with increasing distance from its level of origin.
    See parcel method, conditional instability, absolute stability.

  2. (Also called mechanical instability.) The state of a column of air in the atmosphere when its lapse rate of temperature is greater than the autoconvective lapse rate.

    In such a column the air density would increase with elevation.
    See also autoconvection.