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Which path does a parcel follow above its condensation level?

  • A.An isotherm
  • B.A saturation mixing ratio line, along which the remaining water vapour content of the parcel stays constant
  • C.A saturated adiabat
  • D.A dry adiabat, since the parcel continues to exchange no heat with its surroundings during the whole ascent

Answer: C

Above the condensation level the parcel is saturated and follows a saturated adiabat, cooling more slowly because latent heat is being released. The kink where the parcel curve changes from one family to the other marks the cloud base. Recognising that kink on a plotted parcel path is what distinguishes a correctly constructed analysis from a careless one. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.

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