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Which rate does the dew point fall at during dry adiabatic ascent?

  • A.About 1.8 kelvin per kilometre
  • B.About 9.8 kelvin per kilometre, which is the same rate at which the temperature of the parcel falls with height
  • C.It does not fall at all
  • D.About 6.5 kelvin per kilometre, which is the mean environmental lapse rate observed within the troposphere

Answer: A

The mixing ratio is conserved during dry ascent but the pressure falls, so the vapour pressure falls and with it the dew point, at about 1.8 kelvin per kilometre. The temperature falls much faster at 9.8, which is why the two curves converge and saturation is eventually reached. Their rate of convergence is what gives the 125 metre rule.

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