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Which profile does the convective boundary layer show in its bulk?

  • A.Isothermal throughout, since the vigorous mixing removes any temperature gradient that might develop
  • B.Strongly stable
  • C.Saturated adiabatic, because condensation occurs within the thermals rising through the depth of the layer
  • D.Nearly dry adiabatic with a superadiabatic surface layer

Answer: D

The mixed layer is close to neutral with potential temperature nearly uniform, capped by an entrainment zone and underlain by a thin superadiabatic surface layer. That three part structure is the standard picture of a daytime boundary layer. Condensation occurs only in the cumulus that form at the top, not throughout the layer.

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