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ICON-A: the atmospheric component of the ICON Earth System Model. Part II: Model evaluation

MPS-Authors
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Crueger,  Traute
Climate Dynamics, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;
B 2 - Land Use and Land Cover Change, Research Area B: Climate Manifestations and Impacts, The CliSAP Cluster of Excellence, External Organizations;

/persons/resource/persons37156

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

/persons/resource/persons37112

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

/persons/resource/persons37141

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

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Fiedler,  Stephanie
Climate Dynamics, 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/persons37260

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

/persons/resource/persons73304

Naumann,  Ann Kristin
Hans Ertel Research Group Clouds and Convection, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society, Bundesstraße 53, 20146 Hamburg, DE,;

/persons/resource/persons37291

Peters,  Karsten
Emmy Noether Junior Research Group Cloud-Climate Feedbacks, The Atmosphere 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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Roeckner,  Erich
Climate Modelling, 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;

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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;

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

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Vogel,  Raphaela
Observations and Process Studies, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

/persons/resource/persons37347

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

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Citation

Crueger, T., Giorgetta, M. A., Brokopf, R., Esch, M., Fiedler, S., Hohenegger, C., et al. (2018). ICON-A: the atmospheric component of the ICON Earth System Model. Part II: Model evaluation. Journal of Advances in Modeling Earth Systems, 10, 1638-1662. doi:10.1029/2017MS001233.


Cite as: https://hdl.handle.net/21.11116/0000-0001-53DB-B
Abstract
We evaluate the new icosahedral non-hydrostatic atmospheric (ICON-A) general circulation model of the Max Planck Institute for Meteorology that is flexible to be run at grid-spacings from a few tens of meters to hundreds of kilometers. A simulation with ICON-A at a low resolution (160 km) is compared to a not tuned four-fold higher resolution simulation (40 km). Simulations using the last release of the ECHAM climate model (ECHAM6.3) are also presented at two different resolutions. The ICON-A simulations provide a compelling representation of the climate and its variability. The climate of the low-resolution ICON-A is even slightly better than that of ECHAM6.3. Improvements are obtained in aspects that are sensitive to the representation of orography, including the representation of cloud-fields over eastern-boundary currents, the latitudinal distribution of cloud top heights, and the spatial distribution of convection over the Indian Ocean and the Maritime Continent. Precipitation over land is enhanced, in particular at high resolution ICON-A. The response of precipitation to El Ni\ {n}o SST variability is close to observations, particularly over the eastern Indian Ocean. Some parametrization changes lead to improvements, e.g. with respect to rain intensities and the representation of equatorial waves, but also imply a warmer troposphere, which we suggest leads to an unrealistic poleward mass shift. Many biases familiar to ECHAM6.3 are also evident in ICON-A, namely a too zonal South Pacific Convergence Zone, an inadequate representation of north hemispheric blocking, and a relatively poor representation of tropical intra-seasonal variability.