EERIE: Ocean Eddy-rich Kilometer-scale Climate Simulation with Integrated Forecasting System (IFS) - the Nucleus for European Modelling of the Ocean (NEMO v4.0.7)

EERIE: Ocean Eddy-rich Kilometer-scale Climate Simulation with Integrated Forecasting System (IFS) - the Nucleus for European Modelling of the Ocean (NEMO v4.0.7)

Experiment

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EERIE IFS-NEMO

Summary: The EU project European Eddy-Rich Earth System Models (EERIE) aims to advance kilometre-scale Earth System Models (ESMs) to reduce biases associated with low-resolution climate simulations. Its overarching goal is to develop centennial-scale ESMs that explicitly resolve ocean mesoscale processes, thereby improving the representation of long-term climate evolution, variability, extremes, and potential tipping points.
One of these novel models, the IFS–NEMO–ER coupled system, combines version v4.0.7 of the ocean model NEMO (Madec et al., 2019) and the sea-ice model SI3 (Vancoppenolle et al., 2023) with an upgraded version of the atmospheric model IFS cycle 48r1 (i.e. DE_CY48R1.0_EERIE_20240726). Two configurations are available, with intermediate and high horizontal resolutions.
The high-resolution configuration employs a triangular–cubic–octahedral (Tco1279) atmospheric grid (~9–10 km) with 137 vertical levels and a tripolar global orthogonal curvilinear ocean grid (eORCA12, 1/12°) with 75 depth levels. The intermediate-resolution configuration uses a Tco399 atmospheric grid (~28 km, 137 vertical levels) and the eORCA025 ocean grid (1/4°, 75 depth levels). The intermediate-resolution setup is primarily used for model development and tuning and serves as a lower-resolution counterpart for EERIE experiments.
All model components are coupled using a single-executable approach (Mogensen et al., 2012), enabling highly efficient, low-latency data exchange. Coupling is performed at an hourly frequency, with the exchange of key variables such as sea surface temperature, surface fluxes, sea-ice cover, and ocean currents. The atmosphere–sea-ice coupling follows a new thermodynamic strategy in which SI3 provides sea-ice concentration, albedo, and ice surface temperature directly to IFS.
To equilibrate the coupled system before conducting the production experiments, a 60-year spin-up simulation was first performed under fixed 1950 radiative forcing. The final state of this spin-up was used to provide dynamically balanced initial conditions for the subsequent control-1950 and hist-1950 simulations. The spin-up was initialized with ocean and sea-ice states from EN4 observations representative of 1950 (Good et al., 2013), while atmospheric initial conditions were taken from ERA5 in 2020. Although this atmospheric state is warmer than that of 1950, its impact on the coupled system is negligible due to the atmosphere’s low heat capacity.
Project: EERIE (European Eddy RIch Earth System Models)
Contact: Pablo Ortega (
pablo.ortega@nullbsc.es
)
Spatial Coverage: Longitude 0 to 360 Latitude -90 to 90
Temporal Coverage: 1950-01-01 to 2050-12-31
Use constraints: Creative Commons Attribution 4.0 International (https://creativecommons.org/licenses/by/4.0/)
Data Catalog: World Data Center for Climate
Size: 355.21 GiB (381409147950 Byte)
Format: NetCDF
Status: metadata only
Creation Date: 2025-12-17
Review Date: 2025-12-17

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Funding: European Commission - Horizon Europe
Grant/Award No: 101081383 - European Eddy-RIch ESMs

Contact type	Person	ORCID	Organization
Contact	Pablo Ortega	-	Barcelona Supercomputing Center - Centro Nacional de Supercomputación
Author	Nuno Rocha Monteiro	-	Barcelona Supercomputing Center - Centro Nacional de Supercomputación
Author	Marvin Axness Ferrando	-	Barcelona Supercomputing Center - Centro Nacional de Supercomputación
Author	Daria Kuznetsova	-	Barcelona Supercomputing Center - Centro Nacional de Supercomputación
Author	Pierre-Antoine Bretonnière	-	Barcelona Supercomputing Center - Centro Nacional de Supercomputación
Author	Marc Batlle Martin	-	Barcelona Supercomputing Center - Centro Nacional de Supercomputación
Author	Kai Keller	-	Barcelona Supercomputing Center - Centro Nacional de Supercomputación
Author	Pablo Ortega	-	Barcelona Supercomputing Center - Centro Nacional de Supercomputación
Investigator	Pablo Ortega	-	Barcelona Supercomputing Center - Centro Nacional de Supercomputación
Funder	-	-	European Commission - Horizon Europe

Is documented by

[1] DOI Good, Simon A.; Martin, Matthew J.; Rayner, Nick A. (2013). EN4: Quality controlled ocean temperature and salinity profiles and monthly objective analyses with uncertainty estimates. doi:10.1002/2013jc009067

Is compiled by

[1] DOI Madec, G.; Bell, M.; Bourdallé-Badie, R.; Chanut, J.; Clementi, E.; Coward, A.; Drudi, M.; Epicoco, I.; Ethé, C.; Iovino, D.; Lea, D.; Lévy, C.; Lovato, T.; Martin, N.; Masson, S.; Mathiot, P.; Mele, F.; Mocavero, S.; Moulin, A.; Müeller, S.; Nurser, G.; Rousset, C.; Samson, G.; Storkey, D. (2022). NEMO ocean engine. doi:10.5281/zenodo.6334656

[2] MOGENSEN, Kristian; KEELEY, Sarah; TOWERS, Peter. (2012). Coupling of the NEMO and IFS models in a single executable. https://www.ecmwf.int/sites/default/files/elibrary/2012/11175-coupling-nemo-and-ifs-models-single-executable.pdf

[3] DOI Vancoppenolle, M.; Rousset, C.; Blockley, E.; Aksenov, Y.; Feltham, D.; Fichefet, T.; Garric, G.; Guémas, V.; Iovino, D.; Keeley, S.; Madec, G.; Massonnet, F.; Ridley, J.; Schroeder, D.; Tietsche, S. (2023). SI3, the NEMO Sea Ice Engine. doi:10.5281/zenodo.7534900

Attached Dataset Groups ( 1 )

Parent project(s)

European Eddy RIch Earth System Models

[Entry acronym: EERIE_NEMO] [Entry id: 5369677]