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Which limitation does isentropic analysis have?

  • A.Diabatic processes move parcels between surfaces
  • B.Isentropic surfaces cannot be drawn in a region where the atmosphere is neutrally stratified in depth
  • C.The wind cannot be plotted
  • D.The method applies only above the boundary layer where the flow is very nearly free of any friction

Answer: A

Latent heat release, radiation and turbulent mixing all change a parcel's potential temperature, so its trajectory departs from the isentropic surface exactly where the interesting weather is occurring. Neutral layers do make surfaces vertical and hard to use, which is a real practical difficulty, and boundary layer mixing makes the method unreliable near the ground, but the diabatic limitation is the fundamental one. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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