Abstract
It is shown that each term that represents vorticity flux convergence or divergence in the quasigeostrophic potential vorticity equation can be inverted to obtain fluid acceleration associated with that term, and the same can be obtained for the vortex stretching term. The computed acceleration in the form of a “force potential” shows precisely how the process given by each vorticity term changes the flow field and contributes to its evolution, such as formation and propagation of current features. This complements the standard vorticity diagnostic, which evaluates the magnitudes of the terms only. Application to some simple unstable flows is presented.
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