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A model has a horizontal grid spacing of 100 kilometres. What is the smallest feature it can represent even approximately?

  • A.one hundred metres across
  • B.features of any size at all
  • C.a few hundred kilometres across
  • D.one kilometre across

Answer: C

Correct answer: a few hundred kilometres across

A feature needs several grid points to be represented at all, so the effective resolution is some multiple of the grid spacing - typically four to eight times it. A 100 kilometre grid therefore resolves nothing below a few hundred kilometres, which is why fronts, convective storms and mountain valleys must be parametrised rather than simulated.

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