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    The Response to Stratospheric Forcing and Its Dependence on the State of the Troposphere

    Source: Journal of the Atmospheric Sciences:;2009:;Volume( 066 ):;issue: 007::page 2107
    Author:
    Chan, Cegeon J.
    ,
    Plumb, R. Alan
    DOI: 10.1175/2009JAS2937.1
    Publisher: American Meteorological Society
    Abstract: In simple GCMs, the time scale associated with the persistence of one particular phase of the model?s leading mode of variability can often be unrealistically large. In a particularly extreme example, the time scale in the Polvani?Kushner model is about an order of magnitude larger than the observed atmosphere. From the fluctuation?dissipation theorem, one implication of these simple models is that responses are exaggerated, since such setups are overly sensitive to any external forcing. Although the model?s equilibrium temperature is set up to represent perpetual Southern Hemisphere winter solstice, it is found that the tropospheric eddy-driven jet has a preference for two distinct regions: the subtropics and midlatitudes. Because of this bimodality, the jet persists in one region for thousands of days before ?switching? to another. As a result, the time scale associated with the intrinsic variability is unrealistic. In this paper, the authors systematically vary the model?s tropospheric equilibrium temperature profile, one configuration being identical to that of Polvani and Kushner. Modest changes to the tropospheric state to either side of the parameter space removed the bimodality in the zonal-mean zonal jet?s spatial distribution and significantly reduced the time scale associated with the model?s internal mode. Consequently, the tropospheric response to the same stratospheric forcing is significantly weaker than in the Polvani and Kushner case.
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      The Response to Stratospheric Forcing and Its Dependence on the State of the Troposphere

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    contributor authorChan, Cegeon J.
    contributor authorPlumb, R. Alan
    date accessioned2017-06-09T16:28:08Z
    date available2017-06-09T16:28:08Z
    date copyright2009/07/01
    date issued2009
    identifier issn0022-4928
    identifier otherams-68412.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4209968
    description abstractIn simple GCMs, the time scale associated with the persistence of one particular phase of the model?s leading mode of variability can often be unrealistically large. In a particularly extreme example, the time scale in the Polvani?Kushner model is about an order of magnitude larger than the observed atmosphere. From the fluctuation?dissipation theorem, one implication of these simple models is that responses are exaggerated, since such setups are overly sensitive to any external forcing. Although the model?s equilibrium temperature is set up to represent perpetual Southern Hemisphere winter solstice, it is found that the tropospheric eddy-driven jet has a preference for two distinct regions: the subtropics and midlatitudes. Because of this bimodality, the jet persists in one region for thousands of days before ?switching? to another. As a result, the time scale associated with the intrinsic variability is unrealistic. In this paper, the authors systematically vary the model?s tropospheric equilibrium temperature profile, one configuration being identical to that of Polvani and Kushner. Modest changes to the tropospheric state to either side of the parameter space removed the bimodality in the zonal-mean zonal jet?s spatial distribution and significantly reduced the time scale associated with the model?s internal mode. Consequently, the tropospheric response to the same stratospheric forcing is significantly weaker than in the Polvani and Kushner case.
    publisherAmerican Meteorological Society
    titleThe Response to Stratospheric Forcing and Its Dependence on the State of the Troposphere
    typeJournal Paper
    journal volume66
    journal issue7
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/2009JAS2937.1
    journal fristpage2107
    journal lastpage2115
    treeJournal of the Atmospheric Sciences:;2009:;Volume( 066 ):;issue: 007
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian