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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Volume 11, issue 10
Geosci. Model Dev., 11, 4117-4137, 2018
https://doi.org/10.5194/gmd-11-4117-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Geosci. Model Dev., 11, 4117-4137, 2018
https://doi.org/10.5194/gmd-11-4117-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model description paper 12 Oct 2018

Model description paper | 12 Oct 2018

An EC-Earth coupled atmosphere–ocean single-column model (AOSCM.v1_EC-Earth3) for studying coupled marine and polar processes

Kerstin Hartung1,2,3, Gunilla Svensson1,2,3, Hamish Struthers4,5, Anna-Lena Deppenmeier6,7, and Wilco Hazeleger6,8 Kerstin Hartung et al.
  • 1Department of Meteorology, Stockholm University, Stockholm, Sweden
  • 2Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden
  • 3Swedish e-Science Research Centre, Stockholm, Sweden
  • 4NSC, Linköping, Sweden
  • 5Linköping University, Linköping, Sweden
  • 6Meteorology and Air Quality Department, Wageningen University, Wageningen, the Netherlands
  • 7R&D Weather and Climate Modeling, Royal Netherlands Meteorological Institute (KNMI), De Bilt, the Netherlands
  • 8Netherlands eScience Center, Amsterdam, the Netherlands

Abstract. Single-column models (SCMs) have been used as tools to help develop numerical weather prediction and global climate models for several decades. SCMs decouple small-scale processes from large-scale forcing, which allows the testing of physical parameterisations in a controlled environment with reduced computational cost. Typically, either the ocean, sea ice or atmosphere is fully modelled and assumptions have to be made regarding the boundary conditions from other subsystems, adding a potential source of error. Here, we present a fully coupled atmosphere–ocean SCM (AOSCM), which is based on the global climate model EC-Earth3. The initial configuration of the AOSCM consists of the Nucleus for European Modelling of the Ocean (NEMO3.6) (ocean), the Louvain-la-Neuve Sea Ice Model (LIM3) (sea ice), the Open Integrated Forecasting System (OpenIFS) cycle 40r1 (atmosphere), and OASIS3-MCT (coupler).

Results from the AOSCM are presented at three locations: the tropical Atlantic, the midlatitude Pacific and the Arctic. At all three locations, in situ observations are available for comparison. We find that the coupled AOSCM can capture the observed atmospheric and oceanic evolution based on comparisons with buoy data, soundings and ship-based observations. The model evolution is sensitive to the initial conditions and forcing data imposed on the column. Comparing coupled and uncoupled configurations of the model can help disentangle model feedbacks. We demonstrate that the AOSCM in the current set-up is a valuable tool to advance our understanding in marine and polar boundary layer processes and the interactions between the individual components of the system (atmosphere, sea ice and ocean).

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Single-column models have been used to develop weather and climate models for several decades. They decouple small-scale processes from large-scale forcing and allow us to test models in a controlled environment with reduced computational cost. Here, we present a fully coupled atmosphere–ocean single-column model, including sea ice. We demonstrate that it is a valuable tool to advance our understanding in marine and polar boundary layer processes and interactions of their coupled components.
Single-column models have been used to develop weather and climate models for several decades....
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