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Which simplification does the two-level model make?

  • A.It assumes the wind is the same at both levels so that the thermal wind vanishes throughout the flow
  • B.It neglects the beta effect
  • C.It represents the vertical structure with a continuous set of levels spaced evenly through the depth
  • D.It carries the wind at two levels and the temperature between them

Answer: D

The two-level model predicts the streamfunction at 250 and 750 hectopascals and diagnoses the temperature from their difference, which is the minimum structure capable of representing baroclinic instability. Equal winds at both levels would remove the shear and with it the instability. The beta effect is retained and is essential to the stability criterion the model produces.

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