Journal cover Journal topic
Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/gmd-2018-66
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Model description paper
20 Mar 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).
An EC-Earth coupled atmosphere-ocean single-column model (AOSCM) for studying coupled marine and polar processes
Kerstin Hartung1,2,3, Gunilla Svensson1,2,3, Hamish Struthers4,5, Anna-Lena Deppenmeier6, and Wilco Hazeleger6,7 1Department of Meteorology, Stockholm University, Sweden
2Bolin Centre for Climate Research, Stockholm University, Sweden
3Swedish e-Science Research Centre, Sweden
4NSC, Linköping, Sweden
5Linköping University, Sweden
6Wageningen University, The Netherlands
7Netherlands eScience Center, The Netherlands
Abstract. Single-column models (SCM) have been used as a tool to develop numerical weather prediction and global climate models for several decades. SCMs decouple small-scale processes from large-scale forcing and thus allow to test physical parameterizations 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 on the boundary conditions from other subsystems, adding a potential source of errors. Here, we present a fully coupled atmosphere-ocean SCM (AOSCM), including sea-ice, which is related to the global climate model EC-Earth, consisting of NEMO3.6, LIM3, OpenIFS cycle 40r1, and OASIS3-MCT.

The AOSCM is tested at three locations: the tropical Atlantic, the midlatitude Pacific and the Arctic. At all three locations in-situ observations are available for comparison. Evaluating model performance with buoy data, soundings and ship based observations, we find that the coupled AOSCM can capture the observed atmospheric and oceanic evolution. Model evolution is sensitive to the initial conditions and forcing data imposed on the column. Coupling several model components while alongside using them individually can help disentangle model feedbacks. Although the model can be extended, we demonstrate that already in the current setup it is a valuable tool to advance our understanding in marine and polar boundary layer processes and the interactions of their coupled components.

Citation: Hartung, K., Svensson, G., Struthers, H., Deppenmeier, A.-L., and Hazeleger, W.: An EC-Earth coupled atmosphere-ocean single-column model (AOSCM) for studying coupled marine and polar processes, Geosci. Model Dev. Discuss., https://doi.org/10.5194/gmd-2018-66, in review, 2018.
Kerstin Hartung et al.
Kerstin Hartung et al.
Kerstin Hartung et al.

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Short summary
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 thus allow 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 is a valuable tool to advance our understanding in marine and polar boundary layer processes and the interactions of their coupled components.
Single-column models have been used to develop weather and climate models for several decades....
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