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    Climatology and Forcing of the Quasi-Biennial Oscillation in the MAECHAM5 Model

    Source: Journal of Climate:;2006:;volume( 019 ):;issue: 016::page 3882
    Author:
    Giorgetta, M. A.
    ,
    Manzini, E.
    ,
    Roeckner, E.
    ,
    Esch, M.
    ,
    Bengtsson, L.
    DOI: 10.1175/JCLI3830.1
    Publisher: American Meteorological Society
    Abstract: The quasi-biennial oscillation (QBO) in the equatorial zonal wind is an outstanding phenomenon of the atmosphere. The QBO is driven by a broad spectrum of waves excited in the tropical troposphere and modulates transport and mixing of chemical compounds in the whole middle atmosphere. Therefore, the simulation of the QBO in general circulation models and chemistry climate models is an important issue. Here, aspects of the climatology and forcing of a spontaneously occurring QBO in a middle-atmosphere model are evaluated, and its influence on the climate and variability of the tropical middle atmosphere is investigated. Westerly and easterly phases are considered separately, and 40-yr ECMWF Re-Analysis (ERA-40) data are used as a reference where appropriate. It is found that the simulated QBO is realistic in many details. Resolved large-scale waves are particularly important for the westerly phase, while parameterized gravity wave drag is more important for the easterly phase. Advective zonal wind tendencies are important for asymmetries between westerly and easterly phases, as found for the suppression of the easterly phase downward propagation. The simulation of the QBO improves the tropical upwelling and the atmospheric tape recorder compared to a model without a QBO. The semiannual oscillation is simulated realistically only if the QBO is represented. In sensitivity tests, it is found that the simulated QBO is strongly sensitive to changes in the gravity wave sources. The sensitivity to the tested range of horizontal resolutions is small. The stratospheric vertical resolution must be better than 1 km to simulate a realistic QBO.
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      Climatology and Forcing of the Quasi-Biennial Oscillation in the MAECHAM5 Model

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4220949
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    contributor authorGiorgetta, M. A.
    contributor authorManzini, E.
    contributor authorRoeckner, E.
    contributor authorEsch, M.
    contributor authorBengtsson, L.
    date accessioned2017-06-09T17:02:09Z
    date available2017-06-09T17:02:09Z
    date copyright2006/08/01
    date issued2006
    identifier issn0894-8755
    identifier otherams-78296.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4220949
    description abstractThe quasi-biennial oscillation (QBO) in the equatorial zonal wind is an outstanding phenomenon of the atmosphere. The QBO is driven by a broad spectrum of waves excited in the tropical troposphere and modulates transport and mixing of chemical compounds in the whole middle atmosphere. Therefore, the simulation of the QBO in general circulation models and chemistry climate models is an important issue. Here, aspects of the climatology and forcing of a spontaneously occurring QBO in a middle-atmosphere model are evaluated, and its influence on the climate and variability of the tropical middle atmosphere is investigated. Westerly and easterly phases are considered separately, and 40-yr ECMWF Re-Analysis (ERA-40) data are used as a reference where appropriate. It is found that the simulated QBO is realistic in many details. Resolved large-scale waves are particularly important for the westerly phase, while parameterized gravity wave drag is more important for the easterly phase. Advective zonal wind tendencies are important for asymmetries between westerly and easterly phases, as found for the suppression of the easterly phase downward propagation. The simulation of the QBO improves the tropical upwelling and the atmospheric tape recorder compared to a model without a QBO. The semiannual oscillation is simulated realistically only if the QBO is represented. In sensitivity tests, it is found that the simulated QBO is strongly sensitive to changes in the gravity wave sources. The sensitivity to the tested range of horizontal resolutions is small. The stratospheric vertical resolution must be better than 1 km to simulate a realistic QBO.
    publisherAmerican Meteorological Society
    titleClimatology and Forcing of the Quasi-Biennial Oscillation in the MAECHAM5 Model
    typeJournal Paper
    journal volume19
    journal issue16
    journal titleJournal of Climate
    identifier doi10.1175/JCLI3830.1
    journal fristpage3882
    journal lastpage3901
    treeJournal of Climate:;2006:;volume( 019 ):;issue: 016
    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
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