IFS documentation CY28r1

I. Observation processing

See the Observation Data Base documentation.

II. Data assimilation

1. Overview
2. 4D variational assimilation
3. 3D variational assimilation (with the first-guess at appropriate time)
4. Background term
5. Observational operators and the observation cost function (Jo)
6. Background, analysis and forecast errors
7. Gravity-wave control
8. Diagnostics
9. Observation processing
10. Observation screening
11. Analysis of snow
12. Land-surface analysis
13. Analysis of sea-ice concentration and sea surface temperature
14. Data flow
References

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III. Dynamics and numerical procedures

1. Introduction
2. Basic equations and discretization
3. Semi-Lagrangian formulation
4. Computational details
References

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IV. Physical processes

1. Overview
2. Radiation
3. Turbulent diffusion and interactions with the surface
4. Subgrid-scale orographic drag
5. Convection
6. Clouds and large-scale precipitation
7. Land surface parametrization
8. Methane oxidation
9. Ozone chemistry parametrization
10.Climatological data
References

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V. The Ensemble Prediction System

1. Theory
2. Computational details
References

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VI. Technical and Computational Procedures

1. Structure, data flow and standards
2. Parallel implementatiom
Appendices

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VII. ECMWF wave model

1. Introduction
2. The kinematic part of the energy balance equation
3. Parametrization of source terms and the energy balance in a growing wind sea
4. An optimal interpolation scheme for assimilating altimeter data into the WAM model
5. Numerical scheme
6. The WAM-model software
7. Wind-wave interaction at ECMWF
References

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