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Which quantity does the tropopause separate in terms of entropy?

  • A.Rapidly increasing stratospheric potential temperature from a slowly increasing tropospheric one
  • B.A region of constant potential temperature below from one of decreasing potential temperature above the level
  • C.Two regions of identical stratification
  • D.A stable troposphere from an unstable stratosphere in which the potential temperature falls with height

Answer: A

Potential temperature increases slowly through the troposphere and very rapidly through the stratosphere, so the isentropic surfaces are widely spaced below and tightly packed above. That packing is the strong stratospheric stratification. It is also why potential vorticity, which is inversely proportional to the isentropic layer thickness, is so much larger in the stratosphere. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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