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Which form does the continuity equation take in pressure coordinates?

  • A.The divergence of the mass flux vanishes at every point within the flow field being considered
  • B.The vertical integral of the divergence must equal the tendency of the pressure at the surface below
  • C.The horizontal divergence plus the vertical derivative of omega equals zero
  • D.The material rate of change of density is balanced by the divergence of the three dimensional velocity

Answer: C

In pressure coordinates continuity becomes a purely diagnostic relation with no density and no time derivative, stating that the three-dimensional divergence vanishes. This is one of the chief practical advantages of the coordinate, because it makes omega directly computable by integrating the horizontal divergence in the vertical. The other options give the height coordinate form, a general statement of mass conservation, and the surface pressure tendency equation respectively.

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