Discussion
Which quantity is conserved on an isentropic surface for frictionless adiabatic flow?
Answer: C
Ertel's potential vorticity, expressed on an isentropic surface as the absolute vorticity divided by the isentropic density, is conserved following adiabatic frictionless motion. That makes an isentropic potential vorticity map a display of a conserved tracer, which is why such maps are so revealing. Relative vorticity and pressure both change as the parcel moves. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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