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Developments in the MPI-M Earth System Model version 1.2 (MPI-ESM1.2) and its response to increasing CO2

MPS-Authors
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Mauritsen,  Thorsten
Global Circulation and Climate, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Bader,  Juergen
Director’s Research Group LES, The Land in the Earth System, MPI for Meteorology, Max Planck Society;

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

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Bittner,  Matthias
Director’s Research Group OES, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

/persons/resource/persons37112

Brokopf,  Renate
Wave Driven Circulations, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

/persons/resource/persons37113

Brovkin,  Victor
Climate-Biogeosphere Interaction, The Land in the Earth System, MPI for Meteorology, Max Planck Society;

/persons/resource/persons37123

Claussen,  Martin
Director’s Research Group LES, The Land in the Earth System, MPI for Meteorology, Max Planck Society;

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

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Esch,  Monika
Wave Driven Circulations, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Fiedler,  Stephanie
Global Circulation and Climate, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Gayler,  Veronika
Climate-Biogeosphere Interaction, The Land in the Earth System, MPI for Meteorology, Max Planck Society;

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Giorgetta,  Marco A.
Wave Driven Circulations, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Haak,  Helmut
Director’s Research Group OES, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

Hagemann,  Stefan
MPI for Meteorology, Max Planck Society;

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Hedemann,  Christopher
Director’s Research Group OES, The Ocean 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;
Precipitating Convection, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Ilyina,  Tatiana
Ocean Biogeochemistry, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

Jimenez Cuesta de la Otero,  Diego
Global Circulation and Climate, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;
IMPRS on Earth System Modelling, MPI for Meteorology, Max Planck Society;

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Jungclaus,  Johann H.
Director’s Research Group OES, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

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Kleinen,  Thomas
Climate-Biogeosphere Interaction, The Land in the Earth System, MPI for Meteorology, Max Planck Society;

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Kloster,  Silvia
Emmy Noether Junior Research Group Fire in the Earth System, The Land in the Earth System, MPI for Meteorology, Max Planck Society;

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

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Kinne,  Stefan
Tropical Cloud Observations, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Lasslop,  Gitta
Emmy Noether Junior Research Group Fire in the Earth System, The Land in the Earth System, MPI for Meteorology, Max Planck Society;

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

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Marotzke,  Jochem
Director’s Research Group OES, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

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Matei,  Daniela
Director’s Research Group OES, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

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Meraner,  Katharina
Global Circulation and Climate, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Mikolajewicz,  Uwe
Ocean Physics, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

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Modali,  Kameswarrao
Decadal Climate Predictions - MiKlip, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

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Möbis,  Benjamin
MPI for Meteorology, Max Planck Society;

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Müller,  Wolfgang A.
Decadal Climate Predictions - MiKlip, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

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Nabel,  Julia E. M. S.
Emmy Noether Junior Research Group Forest Management in the Earth System, The Land in the Earth System, MPI for Meteorology, Max Planck Society;

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Nam,  Christine
MPI for Meteorology, Max Planck Society;

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Notz,  Dirk
Max Planck Research Group The Sea Ice in the Earth System, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

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Paulsen,  Hanna
Ocean Biogeochemistry, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

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Pohlmann,  Holger
Decadal Climate Predictions - MiKlip, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

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Pongratz,  Julia
Emmy Noether Junior Research Group Forest Management in the Earth System, The Land 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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Redler,  Rene
Computational Infrastructure and Model Devlopment (CIMD), Scientific Computing Lab (ScLab), MPI for Meteorology, Max Planck Society;

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Reick,  Christian H.
Global Vegetation Modelling, The Land in the Earth System, MPI for Meteorology, Max Planck Society;

Rohrschneider,  Tim
IMPRS on Earth System Modelling, MPI for Meteorology, Max Planck Society;

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Schmidt,  Hauke
Global Circulation and Climate, The Atmosphere 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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Schulzweida,  Uwe
Computational Infrastructure and Model Devlopment (CIMD), Scientific Computing Lab (ScLab), MPI for Meteorology, Max Planck Society;

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Six,  Katharina D.
Ocean Biogeochemistry, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

Stein,  Lukas
Global Circulation and Climate, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Stemmler,  Irene
Ocean Biogeochemistry, The Ocean 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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von Storch,  Jin Song
Ocean Statistics, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

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de Vrese,  Philipp
MPI for Meteorology, Max Planck Society;

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Wieners,  Karl-Hermann
Computational Infrastructure and Model Devlopment (CIMD), Scientific Computing Lab (ScLab), MPI for Meteorology, Max Planck Society;

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Wilkenskjeld,  Stiig
Emmy Noether Junior Research Group Fire in the Earth System, The Land in the Earth System, MPI for Meteorology, Max Planck Society;

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Roeckner,  Erich
MPI for Meteorology, Max Planck Society;

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Winkler,  Alexander
Climate-Biogeosphere Interaction, The Land in the Earth System, MPI for Meteorology, Max Planck Society;
IMPRS on Earth System Modelling, MPI for Meteorology, Max Planck Society;

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Supplementary Material (public)
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Citation

Mauritsen, T., Bader, J., Becker, T., Behrens, J., Bittner, M., Brokopf, R., et al. (2019). Developments in the MPI-M Earth System Model version 1.2 (MPI-ESM1.2) and its response to increasing CO2. Journal of Advances in Modeling Earth Systems, 11, 998-1038. doi:10.1029/2018MS001400.


Cite as: http://hdl.handle.net/21.11116/0000-0001-6FDB-D
Abstract
A new release of the Max Planck Institute for Meteorology Earth System Model (MPI-ESM1.2) is presented. The development focused on correcting errors in and improving the physical processes representation, as well as improving the computational performance, versatility and overall user friendliness. In addition to new radiation- and aerosol parameterizations of the atmosphere, several relatively large, but partly compensating, coding errors in the model’s cloud, convection and turbulence parameterizations were corrected such that the atmospheric physics now conserve energy. Likewise, a coding error in the parameterization of fractional cloud cover, causing earlier versions of the model to have primarily zero or unity cloud fractions, was corrected. The representation of land processes was refined by introducing a multi-layer soil hydrology scheme, extending the land biogeochemistry to include the nitrogen cycle, replacing the soil and litter decomposition model, and improving the representation of wildfires. The oceanbiogeochemistry now represents cyanobacteria prognostically in order to capture the response of nitrogen fixation to changing climate conditions, and further includes improved detritus settling and numerous other refinements. Updated boundary conditions were implemented in order to participate in the sixth phase of the coupled model intercomparison project (CMIP6), and the model has been tuned and spun up to yield a stable pre-industrial climate. We inspect a first set of model simulations, verifying a close match to the observed mean state and instrumental record warming. We find that the model has a climate sensitivity to a doubling of CO2 over pre-industrial conditions of 2.77 K with a highly non-linear global mean response to increasing CO2 forcing, which nonetheless can be represented by a simple two-layer model.