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    Sensitivity of Simulated Climate to Horizontal and Vertical Resolution in the ECHAM5 Atmosphere Model

    Source: Journal of Climate:;2006:;volume( 019 ):;issue: 016::page 3771
    Author:
    Roeckner, E.
    ,
    Brokopf, R.
    ,
    Esch, M.
    ,
    Giorgetta, M.
    ,
    Hagemann, S.
    ,
    Kornblueh, L.
    ,
    Manzini, E.
    ,
    Schlese, U.
    ,
    Schulzweida, U.
    DOI: 10.1175/JCLI3824.1
    Publisher: American Meteorological Society
    Abstract: 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.
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      Sensitivity of Simulated Climate to Horizontal and Vertical Resolution in the ECHAM5 Atmosphere Model

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    contributor authorRoeckner, E.
    contributor authorBrokopf, R.
    contributor authorEsch, M.
    contributor authorGiorgetta, M.
    contributor authorHagemann, S.
    contributor authorKornblueh, L.
    contributor authorManzini, E.
    contributor authorSchlese, U.
    contributor authorSchulzweida, U.
    date accessioned2017-06-09T17:02:08Z
    date available2017-06-09T17:02:08Z
    date copyright2006/08/01
    date issued2006
    identifier issn0894-8755
    identifier otherams-78290.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4220942
    description abstractThe 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.
    publisherAmerican Meteorological Society
    titleSensitivity of Simulated Climate to Horizontal and Vertical Resolution in the ECHAM5 Atmosphere Model
    typeJournal Paper
    journal volume19
    journal issue16
    journal titleJournal of Climate
    identifier doi10.1175/JCLI3824.1
    journal fristpage3771
    journal lastpage3791
    treeJournal of Climate:;2006:;volume( 019 ):;issue: 016
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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