Difference between revisions of "Symmetric instability"

From Glossary of Meteorology
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<div class="definition"><div class="short_definition">Similar to [[inertial instability]] but caused by the imbalance between [[pressure  gradient]] and [[inertial forces]] for infinitesimal disturbances that meridionally displace fluid along  [[isentropes]] (in the [[atmosphere]]) or [[isopycnals]] (in the ocean).</div><br/> <div class="paragraph">For [[geostrophic]] motion in the Northern Hemisphere, symmetric instability may occur only  if the [[potential vorticity]] is negative.</div><br/> </div>
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<div class="definition"><div class="short_definition">Similar to [[inertial instability]] but caused by the imbalance between [[pressure gradient|pressure  gradient]] and [[inertial forces]] for infinitesimal disturbances that meridionally displace fluid along  [[isentropes]] (in the [[atmosphere]]) or [[isopycnals]] (in the ocean).</div><br/> <div class="paragraph">For [[geostrophic]] motion in the Northern Hemisphere, symmetric instability may occur only  if the [[potential vorticity]] is negative.</div><br/> </div>
 
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Latest revision as of 18:03, 25 April 2012



symmetric instability

Similar to inertial instability but caused by the imbalance between pressure gradient and inertial forces for infinitesimal disturbances that meridionally displace fluid along isentropes (in the atmosphere) or isopycnals (in the ocean).

For geostrophic motion in the Northern Hemisphere, symmetric instability may occur only if the potential vorticity is negative.