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    Evaluation of Weather Noise and Its Role in Climate Model Simulations

    Source: Journal of Climate:;2012:;volume( 026 ):;issue: 011::page 3766
    Author:
    Chen, Hua
    ,
    Schneider, Edwin K.
    ,
    Kirtman, Ben P.
    ,
    Colfescu, Ioana
    DOI: 10.1175/JCLI-D-12-00292.1
    Publisher: American Meteorological Society
    Abstract: he relationship between coupled atmosphere?ocean general circulation model simulations and uncoupled simulations made with specified SST and sea ice is investigated using the Community Climate System Model, version 3. Experiments are carried out in a perfect model framework. Two closely related questions are investigated: 1) whether the statistics of the atmospheric weather noise in the atmospheric model are the same as in the coupled model, and 2) whether the atmospheric model reproduces the SST-forced response of the coupled model.The weather noise in both the coupled and uncoupled simulations is found by removing the forced response, as determined from the uncoupled ensemble, from the atmospheric field. The weather-noise variance is generally not distinguishable between the coupled and uncoupled simulations. However, variances of the total fields differ between the coupled and uncoupled simulations, since there is constructive or destructive interference between the SST-forced response and weather noise in the coupled model but no correlation between the SST-forced and weather-noise components in the uncoupled model simulations.Direct regression estimates of the forced response show little difference between the coupled and uncoupled simulations. Differences in local correlations are explained by weather noise because weather noise forces SST in the coupled simulation only.The results demonstrate and explain an important intrinsic difference in precipitation statistics between the coupled and uncoupled simulations. This difference could have consequences for the design of dynamical downscaling experiments and for tuning general circulation models.
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      Evaluation of Weather Noise and Its Role in Climate Model Simulations

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    contributor authorChen, Hua
    contributor authorSchneider, Edwin K.
    contributor authorKirtman, Ben P.
    contributor authorColfescu, Ioana
    date accessioned2017-06-09T17:06:39Z
    date available2017-06-09T17:06:39Z
    date copyright2013/06/01
    date issued2012
    identifier issn0894-8755
    identifier otherams-79532.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4222323
    description abstracthe relationship between coupled atmosphere?ocean general circulation model simulations and uncoupled simulations made with specified SST and sea ice is investigated using the Community Climate System Model, version 3. Experiments are carried out in a perfect model framework. Two closely related questions are investigated: 1) whether the statistics of the atmospheric weather noise in the atmospheric model are the same as in the coupled model, and 2) whether the atmospheric model reproduces the SST-forced response of the coupled model.The weather noise in both the coupled and uncoupled simulations is found by removing the forced response, as determined from the uncoupled ensemble, from the atmospheric field. The weather-noise variance is generally not distinguishable between the coupled and uncoupled simulations. However, variances of the total fields differ between the coupled and uncoupled simulations, since there is constructive or destructive interference between the SST-forced response and weather noise in the coupled model but no correlation between the SST-forced and weather-noise components in the uncoupled model simulations.Direct regression estimates of the forced response show little difference between the coupled and uncoupled simulations. Differences in local correlations are explained by weather noise because weather noise forces SST in the coupled simulation only.The results demonstrate and explain an important intrinsic difference in precipitation statistics between the coupled and uncoupled simulations. This difference could have consequences for the design of dynamical downscaling experiments and for tuning general circulation models.
    publisherAmerican Meteorological Society
    titleEvaluation of Weather Noise and Its Role in Climate Model Simulations
    typeJournal Paper
    journal volume26
    journal issue11
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-12-00292.1
    journal fristpage3766
    journal lastpage3784
    treeJournal of Climate:;2012:;volume( 026 ):;issue: 011
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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