Machine-translated by Google. Questions are authored in English.
Top

Discussion

Which equation set must such a model use?

  • A.The barotropic vorticity equation
  • B.The hydrostatic primitive equations, which remain valid provided the vertical velocity is not too large
  • C.The non-hydrostatic equations
  • D.The quasi-geostrophic equations, which filter the gravity waves that would otherwise dominate the flow

Answer: C

At one kilometre spacing the aspect ratio of the resolved motion approaches unity, so vertical accelerations are comparable with the residual of gravity and the pressure gradient and the hydrostatic assumption fails. Convection permitting models are therefore non-hydrostatic. Quasi-geostrophic and barotropic systems are far too heavily filtered to represent convection at all.

No comment is present. Be the first to comment.
Loading…

Post your comment

Please log in or register to post a comment.