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Which quantity does the thickness of a layer measure?

  • A.The mean pressure within the layer, which decreases upward according to the hydrostatic relation
  • B.The mean density
  • C.The mean wind speed within the layer taken as an average weighted by the mass at each level
  • D.The mean virtual temperature of the layer

Answer: D

The hypsometric equation shows the geopotential thickness between two pressure surfaces to be proportional to the mean virtual temperature of the layer, so thickness charts are temperature charts in disguise. The 1000 to 500 hectopascal thickness is the standard choice, with the 540 decametre contour often used as a rain-snow guide. Density and wind are related to the temperature but are not what thickness measures.

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