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Which depth do superadiabatic layers typically occupy?

  • A.The whole troposphere
  • B.The layer between the lifting condensation level and the level of free convection above a heated surface
  • C.A few metres above a strongly heated surface
  • D.The whole depth of the convective boundary layer, which may reach two kilometres on a summer afternoon

Answer: C

Convection removes instability so efficiently that superadiabatic gradients survive only in the thin surface layer where molecular and turbulent transfer must carry the whole heat flux. Above that the mixed layer is very nearly adiabatic. Measuring a superadiabatic gradient over any greater depth would indicate an instrument error.

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