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Which vertical resolution is required to represent a sharp inversion?

  • A.Uniform spacing of one kilometre throughout the depth of the model, which resolves the whole troposphere evenly
  • B.A single level
  • C.Spacing determined by the horizontal resolution, since the aspect ratio of the grid should remain constant
  • D.Levels spaced tens of metres apart near the surface

Answer: D

A nocturnal inversion only fifty metres deep requires several levels within it, which is why models place their levels very close together near the surface and stretch them with height. Uniform spacing would waste resolution aloft and provide none where it is needed. Poor representation of the stable boundary layer remains a recognised weakness of many models. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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