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Which family of lines shows the temperature a parcel follows on dry ascent?

  • A.The isotherms
  • B.The mixing ratio lines, along which the water vapour content of the parcel remains constant during the ascent
  • C.The dry adiabats
  • D.The saturated adiabats, which apply once the parcel has become saturated and condensation has begun within it

Answer: C

Dry adiabats are lines of constant potential temperature, and an unsaturated parcel moves along one as it is lifted or lowered. They are straight on a tephigram, being lines of constant ordinate before rotation, and gently curved on a skew-T. Following the correct family for the state of the parcel is the essential skill in using any of these diagrams, since a parcel switches from the dry to the saturated family the moment it reaches its condensation level.

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