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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2019-306
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2019-306
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: model description paper 09 Jan 2020

Submitted as: model description paper | 09 Jan 2020

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This preprint is currently under review for the journal GMD.

The Flexible Ocean and Climate Infrastructure Version 1 (FOCI1): Mean State and Variability

Katja Matthes1,2, Arne Biastoch1,2, Sebastian Wahl1, Jan Harlaß1, Torge Martin1, Tim Brücher1, Annika Drews1, Dana Ehlert1, Klaus Getzlaff1, Fritz Krüger1, Willi Rath1, Markus Scheinert1, Franziska U. Schwarzkopf1, Tobias Bayr1, Hauke Schmidt3, and Wonsun Park1 Katja Matthes et al.
  • 1GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
  • 2Christian-Albrechts Universität zu Kiel, Kiel, Germany
  • 3Max-Planck Institute for Meteorology, Hamburg, Germany

Abstract. A new Earth system model, the Flexible Ocean and Climate Infrastructure (FOCI), is introduced. A first version of FOCI consists of a global high-top atmosphere (ECHAM6.3) and an ocean model (NEMO3.6) as well as sea ice (LIM2) and land surface model components (JSBACH), which are coupled through the OASIS3-MCT software package. FOCI includes a number of optional modules which can be activated depending on the scientific question of interest. In the atmosphere, interactive stratospheric chemistry can be used (ECHAM6-HAMMOZ) to study, for example, the effects of the ozone hole on the climate system. In the ocean, a biogeochemistry model (MOPS) is available to study the global carbon cycle. A unique feature of FOCI is the ability to explicitly resolve mesoscale ocean eddies in specific regions. This is realized in the ocean through nesting; first examples for the Agulhas Current and the Gulf Stream systems are described here. FOCI therefore bridges the gap between coarse-resolution climate models and global high-resolution weather prediction and ocean-only models. It allows to study the evolution of the climate system on regional and seasonal to (multi-) decadal scales.

The development of FOCI resulted from a combination of the long-standing expertise in ocean and climate modeling in several research units and divisions at GEOMAR. FOCI will thus be used to complement and interpret long-term observations in the Atlantic, enhance the process understanding of the role of mesoscale oceanic eddies for large-scale oceanic and atmospheric circulation patterns, study feedback mechanisms with stratospheric processes, estimate future ocean acidification, improve the simulation of the Atlantic Meridional Overturning Circulation changes and their influence on climate, ocean chemistry and biology.

In this paper we present both the scientific vision for the development of FOCI as well as some technical details. This includes a first validation of the different model components using several configurations of FOCI. Results show that the model in its basic configuration runs stably under pre-industrial control as well as under historical forcing, and produces a mean climate and variability which compares well with observations, reanalysis products and other climate models. The nested configurations reduce some long-standing biases in climate models and are an important step forward to include the atmospheric response in multi-decadal eddy-rich configurations.

Katja Matthes et al.

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Katja Matthes et al.

Data sets

FOCI data S. Wahl https://doi.org/10.5281/zenodo.3568061

Model code and software

FOCI code and software S. Wahl https://doi.org/10.5281/zenodo.3568061

Katja Matthes et al.

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Short summary
A new Earth system model, the Flexible Ocean and Climate Infrastructure (FOCI), is introduced consisting of a high-top atmosphere, an ocean model, sea ice and land surface model components. A unique feature of FOCI is the ability to explicitly resolve small-scale oceanic features for examples the Agulhas Current and the Gulf Stream. It allows to study the evolution of the climate system on regional and seasonal to (multi-) decadal scales and bridges the gap to coarse-resolution climate models.
A new Earth system model, the Flexible Ocean and Climate Infrastructure (FOCI), is introduced...
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