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Advancing Coupled Atmosphere-Ocean Data Assimilation: Progress on Idealized Systems

This project aims to enhance theoretical understanding of coupled atmosphere-ocean data assimilation through an idealized system. We are developing a simplified, single-column model for both the atmosphere (using a modified ECMWF single-column model) and ocean (a K-Profile Parameterization mixed-layer model). Key updates include code enhancements, the integration of a simplified turbulent diffusion scheme, and capabilities for running various dynamics and physics options. Progress has been made toward adjoint model writing, and documentation efforts continue. The project is funded by NERC and is based at the University of Reading.

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Advancing Coupled Atmosphere-Ocean Data Assimilation: Progress on Idealized Systems

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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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