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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-2018-289
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2018-289
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Model description paper 20 Dec 2018

Model description paper | 20 Dec 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Geoscientific Model Development (GMD).

The upper-atmosphere extension of the ICON general circulation model

Sebastian Borchert1, Guidi Zhou2, Michael Baldauf1, Hauke Schmidt2, Günther Zängl1, and Daniel Reinert1 Sebastian Borchert et al.
  • 1Deutscher Wetterdienst, Offenbach am Main, Germany
  • 2Max-Planck-Institut für Meteorologie, Hamburg, Germany

Abstract. How the upper-atmosphere branch of the circulation contributes to and interacts with the circulation of the middle and lower atmosphere is a research area with many open questions. Inertia-gravity waves, for instance, have moved in the focus of research as they are suspected to be key features in driving and shaping the circulation. Numerical atmospheric models are an important pillar for this research. We use the ICOsahedral Non-hydrostatic (ICON) general circulation model, which is a joint development of the Max Planck Institute for Meteorology (MPI-M) and the German Weather Service (DWD), and provides, e.g., local mass conservation, a flexible grid nesting option and a non-hydrostatic dynamical core formulated on an icosahedral-triangular grid. We extended ICON to the upper atmosphere and present here the two main components of this new configuration named UA-ICON: an extension of the dynamical core from shallow- to deep-atmosphere dynamics, and the implementation of an upper-atmosphere physics package. A series of test cases and climatological simulations show that UA-ICON performs satisfactorily and is in good agreement with the observed global atmospheric circulation.

Sebastian Borchert et al.
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Short summary
We present an upper-atmosphere extension of the ICOsahedral Non-hydrostatic (ICON) model. This includes an extension of the model dynamics from a shallow to a deep atmosphere and the implementation of upper-atmosphere physics parameterizations. Idealized test cases and climate simulations show that this new configuration, named UA-ICON, performs satisfactorily and is in good agreement with the observed global atmospheric circulation.
We present an upper-atmosphere extension of the ICOsahedral Non-hydrostatic (ICON) model. This...
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