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Spin-up of a coupled climate model is the process of

  • A.running it until it reaches a stable state
  • B.increasing its resolution rather gradually
  • C.adding observations to the initial state
  • D.reducing the length of the time step

Answer: A

The deep ocean takes centuries to equilibrate, so a long integration is needed before an experiment can begin. Starting from an unspun state produces drift that can be mistaken for a climate signal. Centuries are needed for the deep ocean.

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