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Which consequence follows from the elliptic character of the omega equation?

  • A.The solution depends only on the boundary conditions and not on the forcing within the interior region
  • B.Local forcing produces compensating motion in surrounding regions
  • C.Omega at a point can be computed from the forcing at that same point without reference to anywhere else
  • D.The equation cannot be solved

Answer: B

Inverting an elliptic operator spreads the influence of a local source over the whole domain, so a region of forced ascent is necessarily accompanied by subsidence elsewhere. This is why clear skies so often accompany a nearby area of heavy rain. The forcing certainly matters, and the equation is routinely solved numerically as part of diagnostic analysis packages.

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