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Which motion do adiabatic parcels perform relative to those surfaces?

  • A.They cross the surface at a rate determined by the vertical velocity of the air at that particular level
  • B.They descend through it
  • C.They oscillate about the surface at the buoyancy frequency without ever remaining upon it for any period
  • D.They remain on the surface

Answer: D

Conservation of potential temperature confines an adiabatic parcel to its isentropic surface, so its vertical motion is determined entirely by the slope of that surface and the horizontal wind along it. This is why isentropic analysis makes vertical motion visible as flow across the height contours of the surface. Diabatic processes are what allow a parcel to change surfaces. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

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