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Which quantity is read from the point where the parcel curve crosses the environment curve?

  • A.The tropopause height
  • B.The height of the boundary layer, above which the influence of the surface is no longer felt by the air
  • C.The level of free convection or the equilibrium level
  • D.The lifting condensation level, at which the ascending parcel first becomes saturated during its ascent

Answer: C

The parcel curve crosses the environment curve at the level of free convection on the way up and at the equilibrium level higher still, bounding the positive area between them. The lifting condensation level is where the parcel curve changes from a dry to a saturated adiabat rather than where it crosses the environment. Distinguishing the crossings from the kink is essential when computing convective energy. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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