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Which conserved quantity labels an air mass most usefully?

  • A.Pressure
  • B.Density, which combines the effects of both temperature and pressure into a single measurable quantity
  • C.Potential temperature
  • D.Temperature, which is measured directly and therefore requires no computation before it can be compared

Answer: C

Potential temperature is conserved during adiabatic vertical motion, so it identifies an air mass regardless of the level at which it is found. Temperature, pressure and density all change as a parcel moves vertically and therefore cannot serve the purpose. This is why isentropic analysis follows surfaces of constant potential temperature.

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