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
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
Building the idealised systemTask 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
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
ECMWF vdf only ECMWF full physics pjs vdf240oE, 19.89oS
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