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Which quantity is conserved for saturated adiabatic ascent?

  • A.Equivalent potential temperature
  • B.Potential temperature, which is conserved for any adiabatic motion whether the parcel is saturated or not
  • C.The mixing ratio
  • D.The relative humidity, which remains at one hundred per cent throughout the whole of a saturated ascent

Answer: A

Once condensation begins, latent heat release raises the potential temperature, but equivalent potential temperature, which accounts for that heat, is conserved. The mixing ratio falls as water is removed by precipitation in the pseudo-adiabatic case. Relative humidity does remain at saturation, which makes that a true statement but not a conserved thermodynamic variable in the required sense. Most errors here come from carrying a result across from a neighbouring case where it does not hold.

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