On one year adjoint/Argo estimates Gael Forget MIT, EAPS Sept 23, 2008 ECCO2 Gael Forget MIT, EAPS Sept 23, 2008 ECCO2 Forget, Ferron, Mercier 08 (Oc.

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Presentation transcript:

On one year adjoint/Argo estimates Gael Forget MIT, EAPS Sept 23, 2008 ECCO2 Gael Forget MIT, EAPS Sept 23, 2008 ECCO2 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.)

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.

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 close fit to obs. extended interpretation of observation … eddying follow on.

achieving a close fit to Argo

ECCO2-Argo WOA01-Argo Misfit to Argo T, 300m,

ECCO2-Argo ECCO1.3-Argo Misfit to Argo T, 300m,

OCCA-Argo ECCO1.3-Argo Misfit to Argo T, 300m,

Extended interpretation of observations

EDW layer at the surface Sept March

19 17 GCM-interpolated profiles | 04 | 05 | 06 | EDW layer below the surface ARGO profiles | 04 | 05 | 06 |

Air-Sea Heat FluxOcean Mixing Divergent Flow Volume Change EDW layer volume budget

… eddying follow on

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.

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

year X-X mean

13 years 5000 m ECCO1.2

3 years OCCA

13 years 3 years ECCO1.2OCCA

year X-X mean

13 years 3 years ECCO1.2OCCA

EDW layer17<T<19°C

EDW layer in Argo profiles

EDW layer in model profiles