EC-Earth3 in CMIP6

The EC-Earth consortium has participated in CMIP6 with eight different configurations of EC-Earth3, which are described in the EC-Earth3 reference paper by Döscher et al. (2022). In total, the consortium participated in 18 CMIP6 endorsed Model Intercomparison Projects (MIPs), besides the Core MIP, with at least one of the EC-Earth3 model configurations (see table below). The different model configurations are described in the EC-Earth3 reference paper by Döscher et al. (2022) and have been documented in the ES-DOC archive. See for instance the EC-Earth3 ES-DOC documentation.

MIP  EC-Earth3 EC-Earth3-LR EC-Earth3-Veg Earth3-Veg-LR EC-Earth3-AerChem EC-Earth3-CC EC-Earth3-GrisIS EC-Earth3-HR
CMIP         ✔         ✔         ✔         ✔         ✔         ✔         ✔         ✔
DCPP         ✔         ✔         ✔
LS3MIP         ✔         ✔
PAMIP         ✔
RFMIP         ✔         ✔
ScenarioMIP         ✔         ✔         ✔         ✔         ✔
VolMIP         ✔
CORDEX         ✔
DynVarMIP         ✔
SIMIP         ✔
VIACSAB         ✔
HighResMIP         ✔
PMIP         ✔         ✔         ✔
C4MIP         ✔
CDRMIP         ✔         ✔
LUMIP         ✔         ✔
OMIP         ✔
ISMIP6         ✔
AerChemMIP         ✔

An important part of the EC-Earth3 data where published in time before the official cut-off date for IPCC Working Group I. For instance, the EC-Earth3 r1i1p1f1 and EC-Earth3-Veg r1i1p1f1 CMIP6 historical and ScenarioMIP tier-1 simulations are part of the IPCC CMIP6 ATLAS; see for instance the screenshot below.

EC-Earth3 r1 & EC-Earth3-Veg r1 in IPCC6 ATLAS ensemble

CMIP6 simulations are carried out by several consortium members on different HPC environments. This has several advantages, from allowing different groups to work with the same tool in parallel to distributing the burden of ensemble climate simulations. Thereby it is critical to ensure that the model provides reproducible results on different computing platforms. While reproducibility in a strong sense (bit-for-bit) is in general infeasible, it must be expected that results obtained in one computing environment are statistically indistinguishable from those obtained in another environment (reproducibility in a weak sense). EC-Earth has developed a protocol to routinely assess the reproducibility in a weak sense for the EC-Earth3 model system. See also Döscher et al. (2022) and Massonnet et al. (2020).

The EC-Earth consortium has established standard tools for configuring (genecec) and postprocessing (ece2cmor3) for all EC-Earth3 configurations and MIP experiment combinations to ensure that the output from all model components adheres to the CMOR standards provided by the CMIP6 data request (Juckes et al., 2020). Most of the CMORized CMIP6 data has been published on ESGF servers; for instance datasets can be searched and downloaded at this NSC ESGF node interface. Also a very fast meta-data and data bug fixer (cmor-fixer) is provided which can also be safely run at the ESGF nodes itself. Errata concerning CMIP6 data and their handling status are published via the ES-DOC errata service. Select EC-Earth-Consortium in the Institution ID drop down menu to obtain a list of EC-Earth3 errata and their status. Moreover, the EC-Earth consortium has also set up the ec-earth-errata-tracer platform for EC-Earth3 data users from outside the consortium to report data issues; however, this has not be used much so far. The EC-Earth consortium has followed the CMIP6 citation service with the result that the CMIP6 EC-Earth3 datasets that have been published on the ESGF nodes are accompanied by an CMIP6 citation, for instance see the citation for the EC-Earth3 ScenarioMIP SSP5-8.5 experiment.

The EC-Earth consortium has taken substantial computing, data transferring and financial effort to provide the large model level data volume request for CORDEX. This ca. 600 TB amount of data is or will be published on the NSC ESGF node. A convenient way to obtain the latest overview of the published EC-Earth3 and EC-Earth3-Veg CORDEX model level data on the NSC ESGF node, is to go to the NSC ESGF node site and navigate to the left-bottom and select the node under the Data Node drop-down menu (and continue by clicking the search).

In addition to the MIPs listed in the table above, the EC-Earth consortium has also participated with EC-Earth3 in CovidMIP (Jones et al., 2021).