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    Coherent Structures in a Baroclinic Atmosphere. Part II: A Truncated Model Approach

    Source: Journal of the Atmospheric Sciences:;1985:;Volume( 042 ):;issue: 023::page 2463
    Author:
    Malguzzi, Piero
    ,
    Rizzoli, Paola Malanotte
    DOI: 10.1175/1520-0469(1985)042<2463:CSIABA>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Many recent studies have been devoted to atmospheric Patterns that persist beyond the synoptic time scale, such as those known as blocking events. In the present paper we explore the possibility that blocking patterns can be modeled with a local approach. We propose a truncated model that is a time-dependent, highly nonlinear extension of our earlier analytical theory. In this theory, stationary coherent structures were found as asymptotic solutions of the inviscid, quasi-geostrophic potential vorticity equation with a mean zonal wind with vertical and horizontal shear, in the limit of weak dispersion and weak nonlinearity. The truncated model is obtained by projecting the potential vorticity equation onto the orthonormal basis defined by the lowest order problem of the asymptotic theory and then suitably truncating the number of modes. The time-evolution of the model is investigated numerically with different truncations. The steady solutions were antisymmetric dipoles, with the anticyclone north of the cyclone; they have an equivalent barotropic vertical structure and are meridionally as well as zonally trapped. We suggest that this solution could model the persistent patterns associated with blocking events that satisfy Rex's definition. An extensive series of numerical experiments is carried out to investigate the persistence of the steady solutions and their stability to different superimposed perturbations. The result is that, in an environment as turbulent as the real atmosphere, a typical estimate of the robustness (predictability) of the solution is of the order of 10 to 12 days. Such persistence is consistent with observations of blocking patterns.
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      Coherent Structures in a Baroclinic Atmosphere. Part II: A Truncated Model Approach

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4155258
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    contributor authorMalguzzi, Piero
    contributor authorRizzoli, Paola Malanotte
    date accessioned2017-06-09T14:26:01Z
    date available2017-06-09T14:26:01Z
    date copyright1985/12/01
    date issued1985
    identifier issn0022-4928
    identifier otherams-19171.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4155258
    description abstractMany recent studies have been devoted to atmospheric Patterns that persist beyond the synoptic time scale, such as those known as blocking events. In the present paper we explore the possibility that blocking patterns can be modeled with a local approach. We propose a truncated model that is a time-dependent, highly nonlinear extension of our earlier analytical theory. In this theory, stationary coherent structures were found as asymptotic solutions of the inviscid, quasi-geostrophic potential vorticity equation with a mean zonal wind with vertical and horizontal shear, in the limit of weak dispersion and weak nonlinearity. The truncated model is obtained by projecting the potential vorticity equation onto the orthonormal basis defined by the lowest order problem of the asymptotic theory and then suitably truncating the number of modes. The time-evolution of the model is investigated numerically with different truncations. The steady solutions were antisymmetric dipoles, with the anticyclone north of the cyclone; they have an equivalent barotropic vertical structure and are meridionally as well as zonally trapped. We suggest that this solution could model the persistent patterns associated with blocking events that satisfy Rex's definition. An extensive series of numerical experiments is carried out to investigate the persistence of the steady solutions and their stability to different superimposed perturbations. The result is that, in an environment as turbulent as the real atmosphere, a typical estimate of the robustness (predictability) of the solution is of the order of 10 to 12 days. Such persistence is consistent with observations of blocking patterns.
    publisherAmerican Meteorological Society
    titleCoherent Structures in a Baroclinic Atmosphere. Part II: A Truncated Model Approach
    typeJournal Paper
    journal volume42
    journal issue23
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1985)042<2463:CSIABA>2.0.CO;2
    journal fristpage2463
    journal lastpage2477
    treeJournal of the Atmospheric Sciences:;1985:;Volume( 042 ):;issue: 023
    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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