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On one year adjoint/Argo estimates

On one year adjoint/Argo estimates. Forget, Ferron, Mercier 08 (Oc. Mod.) Forget, Mercier, Ferron 08 (Oc. Mod.) Forget 09 (JPO, in rev.) Maze, Forget, Buckley, Marshall 09 (JPO, in rev.) Forget, Maze, Buckley, Marshall 09 (to be subm.). Gael Forget

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On one year adjoint/Argo estimates

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  1. On one year adjoint/Argo estimates • Forget, Ferron, Mercier 08 (Oc. Mod.) • Forget, Mercier, Ferron 08 (Oc. Mod.) • Forget 09 (JPO, in rev.) • Maze, Forget, Buckley, Marshall 09 (JPO, in rev.) • Forget, Maze, Buckley, Marshall 09 (to be subm.) Gael Forget MIT, EAPS Sept 23, 2008 ECCO2

  2. Period of interest: • Argo rich period, from ~2004 • much consolidated data base for those recent years • room for better understanding of ocean behavior. • Incentive for GCM-interpolation: • complement obs. constraints with dyn./atm. constraints • and extend interpretation of observations. • Objection to GCM-interpolation: • errors in dyn./atm. may prevent close fit to obs. • a basic matter of balance amongst the various constraints.

  3. What is the trade-off in 1 year adjoint estimates: + rather large data base over one year + relatively easy to achieve close fit to obs. + (-?) GCM dynamics imposed up to seasonal cycle - (+?) adjustments to dynamics for longer time-scales Some success with 1 degree resolution, global, over 2004-5-6. close fit to obs. extended interpretation of observation … eddying follow on.

  4. achieving a close fit to Argo

  5. ECCO2-Argo WOA01-Argo Misfit to ArgoT, 300m, 2004-2006

  6. ECCO2-Argo ECCO1.3-Argo Misfit to ArgoT, 300m, 2004-2006

  7. OCCA-Argo ECCO1.3-Argo Misfit to ArgoT, 300m, 2004-2006

  8. Extended interpretation of observations

  9. 17 18 March Sept 19 17 18 19 EDW layerat the surface

  10. 0 200 400 600 800 19 19 17 17 | 04 | 05 | 06 | | 04 | 05 | 06 | ARGO profiles GCM-interpolated profiles EDW layerbelow the surface

  11. Air-Sea Heat Flux Ocean Mixing Divergent Flow Volume Change EDW layervolume budget

  12. … eddying follow on

  13. From Green’s function to Adjoint: practical for large dimension problem well-adjusted to both regional & global fitting 1 year, global, 1/6 degree: manageable computational cost fairly close fit, water mass studies, etc.

  14. Components in practice Adjoint ok for cube sphere Line Search ok offline Controls ok for Init./forcing/mixing Observations same as for 1 degree (?) Error covariances same as for 1 degree (?) first guess/spin-up start from 1 degree results

  15. X-Xmean year

  16. 5000 m 13 years ECCO1.2

  17. 3 years OCCA

  18. 13 years 3 years ECCO1.2 OCCA

  19. X-Xmean year

  20. 13 years 3 years ECCO1.2 OCCA

  21. EDW layer 17<T<19°C

  22. EDW layerin Argo profiles

  23. EDW layerin model profiles

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