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Three of the following are described as adiabatic processes in cloud formation. Which is the odd one out?

  • A.warming of a parcel by compression during descent
  • B.temperature change of a parcel with no heat exchange
  • C.cooling of air by contact with a cold ground surface
  • D.cooling of a parcel by expansion during ascent

Answer: C

Contact cooling transfers heat out of the air and is therefore diabatic by definition. The other three are all statements of the same adiabatic process seen from different directions. Adiabatic means only that no heat crosses the boundary of the parcel.

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