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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: model evaluation paper 02 Mar 2020

Submitted as: model evaluation paper | 02 Mar 2020

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This preprint is currently under review for the journal GMD.

HighResMIP versions of EC-Earth: EC-Earth3P and EC-Earth3P-HR. Description, model performance, data handling and validation

Rein Haarsma1, Mario Acosta5, Rena Bakhshi2, Pierre-Antoine Bretonnière Bretonnière5, Louis-Philippe Caron5, Miguel Castrillo5, Susanna Corti4, Paolo Davini4, Eleftheria Exarchou5, Federico Fabiano4, Uwe Fladrich3, Ramon Fuentes Franco3, Javier García-Serrano6,5, Jost von Hardenberg4, Torben Koenigk3, Xavier Levine5, Virna Meccia4, Twan van Noije1, Gijs van den Oord2, Froila M. Palmeiro6, Mario Rodrigo6, Yohan Ruprich-Robert5, Philippe Le Sager1, Étienne Tourigny5, Shiyu Wang3, Michiel van Weele1, and Klaus Wyser3 Rein Haarsma et al.
  • 1Royal Netherlands Meteorological Institute (KNMI), De Bilt, the Netherland
  • 2Netherlands eScience Center, Amsterdam, the Netherlands
  • 3Swedish Meteorological and Hydrological Institute (SMHI), Norrköping, Sweden
  • 4Institute of Atmospheric Sciences and Climate, Consiglio Nazionale delle Ricerche (ISAC-CNR), Italy
  • 5Barcelona Supercomputing Center (BSC), Barcelona, Spain
  • 6Group of Meteorology, Universitat de Barcelona (UB), Barcelona, Spain

Abstract. A new global high-resolution coupled climate model, EC-Earth3P-HR has been developed by the EC-Earth consortium, with a resolution of approximately 40 km for the atmosphere and 0.25 degree for the ocean, alongside with a standard resolution version of the model, EC-Earth3P (80 km atmosphere, 1.0 degree ocean). The model forcing and simulations follow the HighResMIP protocol. According to this protocol all simulations are made with both high and standard resolutions. The model has been optimized with respect to scalability, performance, data-storage and post-processing. In accordance with the HighResMIP protocol no specific tuning for the high resolution version has been applied. Increasing horizontal resolution does not result in a general reduction of biases and overall improvement of the variability, and deteriorating impacts can be detected for specific regions and phenomena such as some Euro-Atlantic weather regimes, whereas others such as El Niño-Southern Oscillation show a clear improvement in their spatial structure. The omission of specific tuning might be responsible for this. The shortness of the spin-up, as prescribed by the HighResMIP protocol, prevented the model to reach equilibrium. The trend in the control and historical simulations, however, appeared to be similar, resulting in a warming trend, obtained by subtracting the control from the historical simulation, close to the observational one.

Rein Haarsma et al.

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Rein Haarsma et al.

Rein Haarsma et al.


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Latest update: 28 Mar 2020
Publications Copernicus
Short summary
HighResMIP is an international coordinated CMIP6 effort to investigate the improvement in climate modelling caused by an increase in horizontal resolution. This paper describes EC-Earth3P-(HR) that has been developed for HighResMIP. First analyses reveal that increasing resolution does improve certain aspects of the simulated climate, but that many other biases still continue, possibly related to phenomena that are still not yet resolved and need to be parameterized.
HighResMIP is an international coordinated CMIP6 effort to investigate the improvement in...