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Which comparison determines whether a layer is absolutely stable?

  • A.The environmental rate lies between the saturated and the dry adiabatic rates for the conditions concerned
  • B.The environmental rate is less than the saturated adiabatic rate
  • C.The environmental rate exceeds the dry adiabatic rate throughout the whole depth of the layer being examined
  • D.The environmental rate equals the dry rate

Answer: B

If the environment cools more slowly with height than a saturated parcel would, no parcel can become buoyant however far it is lifted, so the layer is absolutely stable. Inversions are the extreme case. The second option describes absolute instability and the fourth conditional instability, so the three criteria together cover every possibility. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.

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