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Sensitivity of simulated climate to horizontal and vertical resolution in the ECHAM5 atmosphere model

MPG-Autoren
/persons/resource/persons37308

Roeckner,  E.
The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;
Climate Modelling, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

/persons/resource/persons37112

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

/persons/resource/persons37141

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

/persons/resource/persons37156

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

/persons/resource/persons37170

Hagemann,  S.
The Land in the Earth System, MPI for Meteorology, Max Planck Society;
Terrestrial Hydrology, The Land in the Earth System, MPI for Meteorology, Max Planck Society;

/persons/resource/persons37214

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

/persons/resource/persons37254

Manzini,  E.
The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;
Middle and Upper Atmosphere, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

/persons/resource/persons37318

Schlese,  U.
The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

/persons/resource/persons37326

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

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JClim-19-16-3771.pdf
(Verlagsversion), 6MB

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Zitation

Roeckner, E., Brokopf, R., Esch, M., Giorgetta, M., Hagemann, S., Kornblueh, L., et al. (2006). Sensitivity of simulated climate to horizontal and vertical resolution in the ECHAM5 atmosphere model. Journal of Climate, 19(16), 3771-3791. doi:10.1175/JCLI3824.1.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0011-FD7A-A
Zusammenfassung
The most recent version of the Max Planck Institute for Meteorology atmospheric general circulation model, ECHAM5, is used to study the impact of changes in horizontal and vertical resolution on seasonal mean climate. In a series of Atmospheric Model Intercomparison Project (AMIP)-style experiments with resolutions ranging between T21L19 and T159L31, the systematic errors and convergence properties are assessed for two vertical resolutions. At low vertical resolution (L19) there is no evidence for convergence to a more realistic climate state for horizontal resolutions higher than T42. At higher vertical resolution (L31), on the other hand, the root-mean-square errors decrease monotonically with increasing horizontal resolution. Furthermore, except for T42, the L31 versions are superior to their L19 counterparts, and the improvements become more evident at increasingly higher horizontal resolutions. This applies, in particular, to the zonal mean climate state and to the stationary wave patterns in boreal winter. As in previous studies, increasing horizontal resolution leads to a warming of the troposphere, most prominently at midlatitudes, and to a poleward shift and intensification of the midlatitude westerlies. Increasing the vertical resolution has the opposite effect, almost independent of horizontal resolution. Whereas the atmosphere is colder at low and middle latitudes, it is warmer at high latitudes and close to the surface. In addition, increased vertical resolution results in a pronounced warming in the polar upper troposphere and lower stratosphere, where the cold bias is reduced by up to 50% compared to L19 simulations. Consistent with these temperature changes is a decrease and equatorward shift of the midlatitude westerlies. The substantial benefits in refining both horizontal and vertical resolution give some support to scaling arguments deduced from quasigeostrophic theory implying that horizontal and vertical resolution ought to be chosen consistently.