Discussion
Which conserved quantity is used to construct such cross sections?
Answer: B
Mapping potential vorticity on isentropic surfaces shows the intrusion clearly because the quantity is conserved for adiabatic motion and changes sharply across the tropopause. Isentropic potential vorticity maps are a standard research and forecasting product. Temperature and humidity fields show related structure less sharply, and 500 hectopascal vorticity is a different diagnostic. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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