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Which implication does that relationship have for parameterisation?

  • A.Schemes must be sensitive to free tropospheric humidity
  • B.Schemes may safely ignore the humidity aloft, since the buoyancy of the parcel is determined at the surface
  • C.No implication
  • D.Schemes should trigger convection whenever the surface temperature exceeds a fixed threshold for the region

Answer: A

A scheme whose entrainment is too weak produces deep convection in air that is far too dry, which contributes to excessive light rainfall and a poor representation of the intraseasonal variability. Increasing the entrainment sensitivity has improved the simulation of the Madden-Julian Oscillation in several models. It is a good example of a small physical detail with large consequences for the simulated climate.

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