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Which profile does a well mixed layer show?

  • A.A temperature that falls at the saturated adiabatic rate because condensation occurs throughout the layer
  • B.Constant potential temperature and mixing ratio
  • C.Constant temperature and relative humidity throughout the whole of the depth of the layer being examined
  • D.Constant pressure

Answer: B

Vigorous mixing homogenises the conserved variables, so potential temperature and mixing ratio become uniform while the temperature falls at the dry adiabatic rate and the relative humidity rises. Recognising the signature on a sounding is a routine analytical skill. Constant temperature would indicate an isothermal layer, which is very stable rather than well mixed. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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