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    Baroclinic Multiple Zonal Jets on the Sphere

    Source: Journal of the Atmospheric Sciences:;2005:;Volume( 062 ):;issue: 007::page 2484
    Author:
    Lee, Sukyoung
    DOI: 10.1175/JAS3481.1
    Publisher: American Meteorological Society
    Abstract: Multiple zonal jets are investigated with a two-level primitive equation model on the sphere in which both baroclinicity and planetary radius are varied. As in the case for a two-layer quasigeostrophic model on a ?-plane channel, it is found both that the Rhines scale successfully predicts the meridional scale of the multiple zonal jets, and that these jets are maintained in part by an eddy momentum flux divergence associated with slow baroclinic waves at the interjet minimum. A scaling analysis suggests that njets? (a/?m)1/2, with the constraints ?e ≡ 8 sin2f (?m/?? ) > 1 and njets ≥ 1, where njets is the number of the jets, a the planetary radius, ?m one-half of the pole-to-equator potential temperature difference, ?e the supercriticality of the two-layer Phillips model, ?? the potential temperature difference between the two levels, and ? the latitude. The number of jets simulated by the model agrees with this scaling, provided that Ljet ≤ a, where Ljet is the jet scale. In model runs with a large planet where multiple zonal jets exist, the time?mean eddy heat flux is found to be consistent with the diffusive picture of Held and Larichev. In contrast, for the model runs with the planetary size equal to that of Earth, baroclinic adjustment is found to be more relevant. These results are consistent with the finding that in the large-planet (Earth-like) model runs, the jet/eddy scale is smaller than (comparable to) the corresponding planetary radius.
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      Baroclinic Multiple Zonal Jets on the Sphere

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    contributor authorLee, Sukyoung
    date accessioned2017-06-09T16:52:18Z
    date available2017-06-09T16:52:18Z
    date copyright2005/07/01
    date issued2005
    identifier issn0022-4928
    identifier otherams-75668.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4218029
    description abstractMultiple zonal jets are investigated with a two-level primitive equation model on the sphere in which both baroclinicity and planetary radius are varied. As in the case for a two-layer quasigeostrophic model on a ?-plane channel, it is found both that the Rhines scale successfully predicts the meridional scale of the multiple zonal jets, and that these jets are maintained in part by an eddy momentum flux divergence associated with slow baroclinic waves at the interjet minimum. A scaling analysis suggests that njets? (a/?m)1/2, with the constraints ?e ≡ 8 sin2f (?m/?? ) > 1 and njets ≥ 1, where njets is the number of the jets, a the planetary radius, ?m one-half of the pole-to-equator potential temperature difference, ?e the supercriticality of the two-layer Phillips model, ?? the potential temperature difference between the two levels, and ? the latitude. The number of jets simulated by the model agrees with this scaling, provided that Ljet ≤ a, where Ljet is the jet scale. In model runs with a large planet where multiple zonal jets exist, the time?mean eddy heat flux is found to be consistent with the diffusive picture of Held and Larichev. In contrast, for the model runs with the planetary size equal to that of Earth, baroclinic adjustment is found to be more relevant. These results are consistent with the finding that in the large-planet (Earth-like) model runs, the jet/eddy scale is smaller than (comparable to) the corresponding planetary radius.
    publisherAmerican Meteorological Society
    titleBaroclinic Multiple Zonal Jets on the Sphere
    typeJournal Paper
    journal volume62
    journal issue7
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS3481.1
    journal fristpage2484
    journal lastpage2498
    treeJournal of the Atmospheric Sciences:;2005:;Volume( 062 ):;issue: 007
    contenttypeFulltext
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    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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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