EC-Earth V2.2: description and validation of a new seamless earth system prediction model

EC-Earth, a new Earth system model based on the operational seasonal forecast system of the European Centre for Medium-Range Weather Forecasts (ECMWF), is presented. The performance of version 2.2 (V2.2) of the model is compared to observations, reanalysis data and other coupled atmosphere–ocean-sea...

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Bibliographic Details
Published in:Climate Dynamics
Main Authors: Hazeleger, W., Wang, X., Severijns, C., van der Linden, E.C.
Format: Article in Journal/Newspaper
Language:English
Published: 2012
Subjects:
circulation
climate-change
coupled models
ecmwf model
energy budget
ice
ocean
sea-surface temperature
simulations
variability
Arctic
Southern Ocean
Climate change
Sea ice
Online Access:https://research.wur.nl/en/publications/ec-earth-v22-description-and-validation-of-a-new-seamless-earth-s
https://doi.org/10.1007/s00382-011-1228-5
Description
Summary:EC-Earth, a new Earth system model based on the operational seasonal forecast system of the European Centre for Medium-Range Weather Forecasts (ECMWF), is presented. The performance of version 2.2 (V2.2) of the model is compared to observations, reanalysis data and other coupled atmosphere–ocean-sea ice models. The largescale physical characteristics of the atmosphere, ocean and sea ice are well simulated. When compared to other coupled models with similar complexity, the model performs well in simulating tropospheric fields and dynamic variables, and performs less in simulating surface temperature and fluxes. The surface temperatures are too cold, with the exception of the Southern Ocean region and parts of the Northern Hemisphere extratropics. The main patterns of interannual climate variability are well represented. Experiments with enhanced CO2 concentrations show well-known responses of Arctic amplification, land-sea contrasts, tropospheric warming and stratospheric cooling. The global climate sensitivity of the current version of EC-Earth is slightly less than 1 K/(W m-2). An intensification of the hydrological cycle is found and strong regional changes in precipitation, affecting monsoon characteristics. The results show that a coupled model based on an operational seasonal prediction system can be used for climate studies, supporting emerging seamless prediction strategies.

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