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An ensemble of model runs is used to

  • A.eliminate all of the uncertainty entirely
  • B.sample the range of possible outcomes
  • C.make the model run rather faster
  • D.reduce the grid spacing used

Answer: B

Perturbing the initial conditions, the parameters or using several models each samples a different kind of uncertainty. The spread of the ensemble is as informative as its mean. Different ensembles sample different things.

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