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Which parameterisation problem does this pose for a coarse resolution model?

  • A.The updraught velocity must be predicted exactly in order for the mass flux to be correctly represented
  • B.The cloud base height cannot be determined without a finer vertical spacing than models normally use
  • C.The horizontal extent of the cloud must be resolved by at least four grid points to avoid instability
  • D.The compensating subsidence must be represented within a single grid box

Answer: D

A grid box of tens of kilometres contains both the updraught and its compensating subsidence, so the scheme must represent the net effect of the pair on the box mean temperature and humidity rather than either separately. This is the essence of mass flux convection parameterisation. Predicting individual cloud properties exactly is neither possible nor necessary for that purpose.

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