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Which circumstance makes the slice correction important?

  • A.An isolated narrow thermal rising through an otherwise undisturbed environment across a wide horizontal area
  • B.A very dry atmosphere
  • C.Conditions in which the environmental lapse rate is exactly equal to the dry adiabatic value at every level
  • D.Widespread ascent over a large fraction of the area

Answer: D

When the ascending region occupies a substantial fraction of the area, the compensating descent is confined to a small remaining region and warms it strongly, so the effective stability is much greater. This matters for layer lifting at fronts and for the onset of widespread convection. An isolated thermal is precisely the case in which the parcel method is adequate. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.

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