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Discussion papers | Copyright
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

Model description paper | 20 Mar 2018

Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Geoscientific Model Development (GMD) and is expected to appear here in due course.

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 Kerstin Hartung et al.
  • 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.

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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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