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Building an idealised coupled system:

Building an idealised coupled system: . A quick update Polly Smith, Amos Lawless, Alison Fowler* School of Mathematical and Physical Sciences, University of Reading, UK * funded by NERC. Objective.

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Building an idealised coupled system:

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  1. Building an idealised coupled system: A quick update Polly Smith, Amos Lawless, Alison Fowler* School of Mathematical and Physical Sciences, University of Reading, UK * funded by NERC

  2. Objective To use an idealised system to gain a greater theoretical understanding of the coupled atmosphere-ocean data assimilation problem: • explore different approaches to coupled 4D-Var data assimilation using a single-column, coupled atmosphere-ocean model

  3. Building the idealised system Task 1: develop an idealised, single-column, coupled atmosphere-ocean model with a strong-constraint incremental 4D-Var assimilation scheme. For this we need a model that • is simple and quick to run • is able to represent realistic atmosphere-ocean coupling Atmosphere: • simplified ECMWF single column model (SCM) Ocean: • single column KPP (K-Profile Parameterisation) mixed-layer ocean model

  4. Update on progress so far • revisited stripped down SCM code, now includes simplified version of IFS turbulent diffusion scheme • option to run with: dynamics + turbulent diffusion only dynamics + full physics (i.e. original code) • simplified turbulent diffusion scheme computes surface fluxes to pass to ocean model => ready to couple to ocean model • (almost) ready to start writing adjoint models • continuing to produce & update documentation • svn repository now in place

  5. ECMWF vdf only ECMWF full physics pjsvdf 240oE, 19.89oS

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