1. Interoperability Summary of Key Technical Issues

2. 2 History of Interoperability Programme Proposal Why Interoperability How to achieve Interoperability Issues raised during presentations

3. 3 Why Interoperability Comparison, Verification, … Initial and Boundary Conditions Ensembles Business Continuity (Backup) Sub-Models

4. 4 How to achieve Interoperability Data Exchange –High Priority: Model Data –Low Priority: Observations Common Format Import / Export Common Format (adaptors / data conversion) List of Products Closer Look to special Formats (Grib2 / NetCDF)

5. 5 Issues Raised Data Exchange – List of what to exchange –Amount of data –Where to put in the operational suite

6. 6 Issues Raised (II) Common Formats –Header – Data –Grids (horizontal – vertical) Strong governance definition vs. Leave things to producers (to provide Toolbox, bilateral agreements) –Single exchange format

7. 7 Issues Raised (III) Data Conversion (Import/Export Common Format) –Easy for atmosphere –Problematic for surface / soil variables –Different parameters for different models (e.g. temperature vs. Potential temperature) –Producer should be responsible for postprocessing products (e.g. PV)

8. 8 Issues Raised (IV) List of Products –Need commonly agreed parameters –High Priority List (e.g. for verification) –List for IC / BCs

9. 9 General Issues Critical: Treatment of soil, surface, orography, etc. Experiences from Multi-Model, Multi-Boundary Ensembles (INM) –Exchange Issues (is it lower priority ?) –Maintainance (!) and Development of Software Avoid double interpolation Documentation