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Which quantity does a tephigram plot on its axes?

  • A.Height against temperature
  • B.Mixing ratio against pressure, so that saturated ascent may be followed along a single straight line upward
  • C.Temperature against the logarithm of potential temperature
  • D.Pressure against temperature directly, with straight lines representing the dry adiabatic lapse rate throughout

Answer: C

A tephigram plots temperature against the logarithm of potential temperature, with the whole diagram rotated so that pressure decreases roughly upward and isotherms run diagonally. The area on the diagram is proportional to energy, which is the property that makes it so useful. Other thermodynamic diagrams such as the skew-T and the Stuve make different compromises among the same set of desirable properties, and each is preferred in a different country.

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