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Which distinction separates reversible and pseudo-adiabatic ascent?

  • A.Whether the latent heat released during condensation is retained within the parcel or radiated away to space
  • B.Whether the condensed water is retained or removed
  • C.Whether the ascent is slow enough for the parcel to remain in thermal equilibrium with its surroundings
  • D.Whether the parcel is saturated

Answer: B

In the reversible process the condensed water stays with the parcel and can be re-evaporated on descent, while in the pseudo-adiabatic process it falls out immediately. Real ascent lies between the two. The difference in the resulting lapse rate is small, typically a few tenths of a kelvin per kilometre, but the pseudo-adiabatic case is irreversible while the other is not. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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