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Which family shows the water vapour content of a parcel?

  • A.The saturation mixing ratio lines
  • B.The saturated adiabats, along which the parcel loses water continuously as condensation proceeds during ascent
  • C.The isobars
  • D.The dry adiabats, along which the potential temperature of the parcel remains fixed throughout its ascent

Answer: A

Saturation mixing ratio lines, usually drawn dashed, give the mixing ratio of saturated air at each point, so following one from the dew point at the surface gives the mixing ratio of the actual air. Their intersection with the dry adiabat through the surface temperature locates the lifting condensation level. They are the least obtrusive family on the diagram and are also the most frequently overlooked by beginners. Most errors here come from carrying a result across from a neighbouring case where it does not hold.

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