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Files have been generated using netcdf-c verion 4.4.1.1 and hdf5 version 1.8.18 libraries using NETCDF4 data model. The resulting files are NetCFD format and metadata is CF1.9¹² compliant allowing for string type NetCDF variables (used to define some attributes in the files, such as members). The attribute convention for data discovery is ACDD-1.3¹³ compliant (including reference, geospatial, etc.).
Data is stored in different files for different experiments, scenarios and variables/indices (using the naming convention experiment scenario_index.nc{_}), including all members (see Table A1.1) in the same file using the member attribute and the full time periods described in Section 2.3; this was done to facilitate long-term data archival in the IPCC-DDC and the resulting dataset contains 806 files with a total volume of 400 GB (high compression rate is used), with file sizes ranging from 5GB to 600 KB. The archiving convention can be adapted to facilitate CDS archiving, adopting other convention and/or splitting the files for different members and/or years.Data transfer can be done though either push or pull approaches at the CDS convenience. This will be agreed in the next coordination meeting with CDS representatives, scheduled for 12 September, during the C3S General Assembly.

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