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The saturated adiabatic lapse rate is smaller than the dry rate because

  • A.saturated air expands less rapidly as it ascends
  • B.saturated air is markedly denser than unsaturated air
  • C.condensation removes heat from the rising parcel itself
  • D.latent heat released by condensation warms the parcel

Answer: D

Once condensation begins, the latent heat released partly offsets the cooling from expansion. The saturated rate is therefore variable, being near 4 degrees per kilometre in warm moist air and approaching the dry rate in very cold air.

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