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Which behaviour does potential temperature show as a parcel descends?

  • A.It rises
  • B.It remains constant while the temperature also remains constant throughout the whole of the descent involved
  • C.It remains constant while the temperature rises
  • D.It falls, since the parcel is being compressed and its entropy therefore decreases during the whole descent

Answer: C

Adiabatic descent compresses and warms the parcel, but the potential temperature is defined precisely to be unchanged by that compression. The temperature rises at the dry adiabatic rate of 9.8 kelvin per kilometre. Recognising that one quantity changes while the other does not is the whole purpose of introducing the potential temperature at all.

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