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&---- Journal of Marine Research . 59 (5), 725-747.

Geostrophy via Potential Vorticity Inversion in the Yucatan Channel. J. Ochoa J. Sheinbaum J. Candela A. Badan CICESE Baja California, MEXICO --- Joint IAPSO/IABO Assembly. Mar de Plata, Argentina, 21-28 octubre. &---- Journal of Marine Research . 59 (5), 725-747.

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&---- Journal of Marine Research . 59 (5), 725-747.

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  1. Geostrophy via Potential Vorticity Inversion in the Yucatan Channel.J. OchoaJ. SheinbaumJ. CandelaA. BadanCICESEBaja California, MEXICO--- Joint IAPSO/IABO Assembly. Mar de Plata, Argentina, 21-28 octubre. &---- Journal of Marine Research. 59 (5), 725-747.

  2. Traditionally the so calledDynamical Method was the most common way to infer velocityout of the available measurements = hydrography.

  3. Nowdays, technological improvements allow us to measure vertical profiles of the horizontal velocity besides hydrography (for example LADCP/CTD)

  4. Hydrography

  5. Velocity Maps

  6. So why bother with the issue of Geostrophy if we have it ALL, not just the geostrophic fraction. Because, for many purposes the high frequency fluctuations are noise. Quite commonly we want the semipermanent flow, without transients. Upwelling estimates via the Omega Equation start with the quasi-geostrophic contribution.

  7. This study is an attempt to do this separation via a method consistent with simple linear dynamics.

  8. Invariant

  9. Minimization

  10. EOFS

  11. LADCP DATA

  12. Mooring Data

  13. Table

  14. Possible Path

  15. Conclusions • LADCP/CTD => We can measure potential vorticity. • Minimization of the Internal Wave Energy is the natural choice to estimate geostrophic fields because: - It is consistent with the conservation of Potential Vorticity - Provides the Boundary Conditions. • The Thermal Wind Equation plays no role in the estimation procedure, it is solved automatically.

  16. Known Problems • Lack of simultaneity of the data and tidal currents, may contaminate potential vorticity estimates and also influence the results via the boundary conditions. • Unreal density invertions may exist in the geostrophic estimate.

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