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Three of the following are parameterised in a typical weather model. Which is the odd one out?

  • A.autoconversion of cloud water to rain
  • B.ice nucleation on aerosol particles
  • C.the fall speed of precipitation particles
  • D.the large scale horizontal wind field

Answer: D

The horizontal wind is resolved directly by the model dynamics. The other three occur at scales far below the grid and must be represented by parameterisation. Grid spacing sets the boundary between the two categories.

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