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Which appearance does a well mixed boundary layer have?

  • A.A dry adiabatic temperature profile with a constant mixing ratio
  • B.An isothermal profile with a constant relative humidity throughout the whole depth of the mixed layer above
  • C.A saturated adiabatic profile
  • D.A profile in which both the temperature and the dew point increase steadily with height through the layer

Answer: A

Vigorous mixing homogenises the conserved variables, so potential temperature and mixing ratio become uniform, which appears on the diagram as the temperature curve lying along a dry adiabat and the dew point curve along a saturation mixing ratio line. The two converge with height because one family is steeper than the other. That convergence is what eventually produces cloud at the top of the layer. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

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