The Beta spiral method is an inverse process for determining the oceanic velocity field, where the motion is geostrophic and the potential vorticity locally balanced. This method provides a mechanism for determining the absolute geostrophic circulation field rather than merely the relative field.
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- G.Bigg. The beta spiral method Deep Sea Research Part A. Oceanographic Research Papers, vol. 32, issue 4, pp. 465-484
- F. A. Schott and H. Stommel. Beta spirals and absolute velocities from different oceans. Deep Sea Res., 25: 961–1010, 1978.