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Which process is meant by isentropic upglide?

  • A.The descent of stratospheric air
  • B.The lifting of a parcel by the buoyancy it acquires when it becomes warmer than its surroundings
  • C.Ascent along a sloping surface of constant potential temperature
  • D.The vertical mixing of air between the boundary layer and the free troposphere during the afternoon

Answer: C

For adiabatic motion a parcel is confined to its isentropic surface, so where those surfaces slope upward along the flow the parcel must rise. This is the natural way to visualise frontal ascent, since frontal surfaces are close to isentropic. Isentropic analysis makes the vertical motion visible as flow along a sloping surface rather than as a small residual computed from divergence.

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