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Which construction locates the lifting condensation level?

  • A.The point at which the environmental curve crosses the moist adiabat drawn through the surface temperature
  • B.The intersection of the dry adiabat with the saturation mixing ratio line
  • C.The intersection of the temperature curve with the dew point curve at the level where the two happen to meet
  • D.The intersection of two saturated adiabats

Answer: B

Following the dry adiabat upward from the surface temperature and the saturation mixing ratio line upward from the surface dew point, the two meet at the lifting condensation level. That construction encodes the fact that potential temperature and mixing ratio are both conserved during dry ascent. It is the first step in every parcel analysis and is worth practising until it becomes automatic. Most errors here come from carrying a result across from a neighbouring case where it does not hold.

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