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ICON-A: the atmospheric component of the ICON Earth System Model. Part I: Model description

MPS-Authors
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Giorgetta,  Marco A.
Climate Modelling, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Brokopf,  Renate
Climate Modelling, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

/persons/resource/persons37126

Crueger,  Traute
Climate Dynamics, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Esch,  Monika
Climate Modelling, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Fiedler,  Stephanie
Director’s Research Group AES, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Hohenegger,  Cathy
Hans Ertel Research Group Clouds and Convection, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

/persons/resource/persons37214

Kornblueh,  Luis
Computational Infrastructure and Model Devlopment (CIMD), Scientific Computing Lab (ScLab), MPI for Meteorology, Max Planck Society;

/persons/resource/persons37254

Manzini,  Elisa
Minerva Research Group Stratosphere and Climate, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Mauritsen,  Thorsten
Climate Dynamics, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

/persons/resource/persons37277

Nam,  Christine
The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Raddatz,  Thomas
Global Vegetation Modelling, The Land in the Earth System, MPI for Meteorology, Max Planck Society;

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Rast,  Sebastian
Middle and Upper Atmosphere, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Sakradzija,  Mirjana
Hans Ertel Research Group Clouds and Convection, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Schmidt,  Hauke
Middle and Upper Atmosphere, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

Schneck,  Rainer
Global Vegetation Modelling, The Land in the Earth System, MPI for Meteorology, Max Planck Society;

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Schnur,  Reiner
Global Vegetation Modelling, The Land in the Earth System, MPI for Meteorology, Max Planck Society;

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Stevens,  Bjorn
Director’s Research Group AES, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Citation

Giorgetta, M. A., Brokopf, R., Crueger, T., Esch, M., Fiedler, S., Helmert, J., et al. (in press). ICON-A: the atmospheric component of the ICON Earth System Model. Part I: Model description. Journal of Advances in Modeling Earth Systems, accepted manuscript, available online. doi:10.1029/2017MS001242.


Cite as: https://hdl.handle.net/21.11116/0000-0001-42CA-1
Abstract
ICON‐A is the new icosahedral non‐hydrostatic (ICON) atmospheric general circulation model in a configuration using the Max Planck Institute (MPI) physics package, which originates from the ECHAM6 general circulation model, and has been adapted to account for the changed dynamical core framework. The coupling scheme between dynamics and physics employs a sequential updating by dynamics and physics, and a fixed sequence of the physical processes similar to ECHAM6. To allow a meaningful initial comparison between ICON‐A and the established ECHAM6‐LR model, a setup with similar, low resolution in terms of number of grid points and levels is chosen. The ICON‐A model is tuned on the base of the AMIP experiment aiming primarily at a well balanced top‐of atmosphere energy budget to make the model suitable for coupled climate and Earth system modeling. The tuning addresses firstly the moisture and cloud distribution to achieve the top‐of‐atmosphere energy balance, followed by the tuning of the parameterized dynamic drag aiming at reduced wind errors in the troposphere. The resulting version of ICON‐A has overall biases which are comparable to those of ECHAM6. Problematic specific biases remain in the vertical distribution of clouds and in the stratospheric circulation, where the winter vortices are too weak. Biases in precipitable water and tropospheric temperature are, however, reduced compared to the ECHAM6. ICON‐A will serve as the basis of further development and as the atmosphere component to the coupled model, ICON‐ESM.