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Which quantity is measured as an area on such a diagram?

  • A.Convective available potential energy
  • B.The total precipitable water contained within the column, obtained by integrating the mixing ratio upward
  • C.The lapse rate
  • D.The height of the tropopause, which is read from the level at which the environment curve changes its slope

Answer: A

The positive area between the parcel curve and the environment curve above the level of free convection is the convective available potential energy, in joules per kilogram. Values above about 2000 indicate the potential for severe convection. Precipitable water is obtained by integrating the humidity, which is a different operation on the same sounding. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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