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ROMS/TOMS Tangent Linear and Adjoint Models

ROMS/TOMS Tangent Linear and Adjoint Models. Andrew Moore, CU Hernan Arango, Rutgers U Arthur Miller, Bruce Cornuelle, Emanuele Di Lorenzo, Doug Neilson UCSD. Major Objective.

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ROMS/TOMS Tangent Linear and Adjoint Models

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  1. ROMS/TOMS Tangent Linear and Adjoint Models Andrew Moore, CU Hernan Arango, Rutgers U Arthur Miller, Bruce Cornuelle, Emanuele Di Lorenzo, Doug Neilson UCSD

  2. Major Objective • In addition to IOM, provide the ocean modelling community with analysis and prediction tools available in meteorology and NWP, using a community OGCM (ROMS).

  3. Overview • NL ROMS: • Perturbation:

  4. Overview • NL ROMS: • TL ROMS: (TL1) • AD ROMS: (AD)

  5. Overview • Second TLM: (TL2) • TL1= Representer Model • TL2= Tangent Linear Model

  6. Current Status of TL and AD • All advection schemes • Most mixing and diffusion schemes • All boundary conditions • Orthogonal curvilinear grids • All equations of state • Coriolis, pressure gradient, etc.

  7. Picard Iteration Test (TL2):

  8. 1 1 1 2 2 3 3 4 4 5 5 1 • 6 month integration time • 50 Picard iterations 2 3 4 5

  9. Available Drivers (TL1, AD) • Singular vectors: • Eigenmodes of and • Forcing Singular vectors: • Stochastic optimals: • Pseudospectra:

  10. Southern California Bight (SCB) • Model grid 1200kmX1000km • 10km resolution, 20 levels • Di Lorenzo et al. (2003)

  11. SCB Examples

  12. Pseudospectrum

  13. Singular Vectors • Energy norm, 5 day growth time

  14. Confluence and diffluence

  15. Boundary sensitivity

  16. Seasonal Dependence

  17. Stochastic Optimals

  18. Drivers under development • Ensemble prediction (SVs, FSVs, SOs, following NWP) • 4D Variational Assimilation (4DVar) • Greens function assimilation • IOM interface (IROMS) (NL, TL1, TL2, AD)

  19. Publications • Moore, A.M., H.G Arango, E. Di Lorenzo, B.D. Cornuelle, A.J. Miller and D. Neilson, 2003:A comprehensive ocean prediction and analysis system based on the tangent linear and adjoint of a regional ocean model. Ocean Modelling, Final revisions. • H.G Arango, Moore, A.M., E. Di Lorenzo, B.D. Cornuelle, A.J. Miller and D. Neilson, 2003:The ROMS tangent linear and adjoint models: A comprehensive ocean prediction and analysis system. Rutgers Tech. Report, In preparation.

  20. What next? • Complete 4DVar driver • Interface barotropic ROMS to IOM • Complete 3D Picard iteration test (TL2) • Interface 3D ROMS to IOM

  21. SCB Examples

  22. Confluence and diffluence

  23. Boundary sensitivity

  24. Stochastic Optimals

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