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Which property makes the tephigram particularly useful?

  • A.The isotherms are vertical, which makes it easy to read the temperature at any level from the plotted curve
  • B.Pressure is linear
  • C.The saturated adiabats are straight lines, so that moist ascent may be followed without reference to a curve
  • D.Area on the diagram is proportional to energy

Answer: D

Because the axes are temperature and entropy, an area on the tephigram represents work or energy, so convective available potential energy can be measured directly as an area between the parcel and environment curves. This is the defining advantage of the family of diagrams to which it belongs. Its isotherms are diagonal rather than vertical and its saturated adiabats are curved. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

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