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    On the Dynamics of Two-Dimensional Hurricane-Like Vortex Symmetrization

    Source: Journal of the Atmospheric Sciences:;2010:;Volume( 067 ):;issue: 011::page 3559
    Author:
    Martinez, Y.
    ,
    Brunet, G.
    ,
    Yau, M. K.
    DOI: 10.1175/2010JAS3499.1
    Publisher: American Meteorological Society
    Abstract: Despite the fact that asymmetries in hurricanes, such as spiral rainbands, polygonal eyewalls, and mesovortices, have long been observed in radar and satellite imagery, many aspects of their origin, space?time structure, and dynamics still remain unsolved, particularly their role on the vortex intensification. The underlying inner-core dynamics need to be better understood to improve the science of hurricane intensity forecasting. To fill this gap, a simple 2D barotropic ?dry? model is used to perform two experiments starting respectively with a monopole and a ring of enhanced vorticity to mimic hurricane-like vortices during incipient and mature stages of development. The empirical normal mode (ENM) technique, together with the Eliassen?Palm (EP) flux calculations, are used to isolate wave modes from the model datasets to investigate their space?time structure, kinematics, and the impact on the changes in the structure and intensity of the simulated hurricane-like vortices. From the ENM diagnostics, it is shown in the first experiment how an incipient storm described by a vortex monopole intensifies by ?inviscid damping? of a ?discrete-like? vortex Rossby wave (VRW) or quasi mode. The critical radius, the structure, and the propagating properties of the quasi mode are found to be consistent with predictions of the linear eigenmode analysis of small perturbations. In the second experiment, the fastest growing wavenumber-4 unstable VRW modes of a vortex ring reminiscent of a mature hurricane are extracted, and their relation with the polygonal eyewalls, mesovortices, and the asymmetric eyewall contraction are established in consistency with results previously obtained from other authors.
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      On the Dynamics of Two-Dimensional Hurricane-Like Vortex Symmetrization

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    contributor authorMartinez, Y.
    contributor authorBrunet, G.
    contributor authorYau, M. K.
    date accessioned2017-06-09T16:34:33Z
    date available2017-06-09T16:34:33Z
    date copyright2010/11/01
    date issued2010
    identifier issn0022-4928
    identifier otherams-70278.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4212041
    description abstractDespite the fact that asymmetries in hurricanes, such as spiral rainbands, polygonal eyewalls, and mesovortices, have long been observed in radar and satellite imagery, many aspects of their origin, space?time structure, and dynamics still remain unsolved, particularly their role on the vortex intensification. The underlying inner-core dynamics need to be better understood to improve the science of hurricane intensity forecasting. To fill this gap, a simple 2D barotropic ?dry? model is used to perform two experiments starting respectively with a monopole and a ring of enhanced vorticity to mimic hurricane-like vortices during incipient and mature stages of development. The empirical normal mode (ENM) technique, together with the Eliassen?Palm (EP) flux calculations, are used to isolate wave modes from the model datasets to investigate their space?time structure, kinematics, and the impact on the changes in the structure and intensity of the simulated hurricane-like vortices. From the ENM diagnostics, it is shown in the first experiment how an incipient storm described by a vortex monopole intensifies by ?inviscid damping? of a ?discrete-like? vortex Rossby wave (VRW) or quasi mode. The critical radius, the structure, and the propagating properties of the quasi mode are found to be consistent with predictions of the linear eigenmode analysis of small perturbations. In the second experiment, the fastest growing wavenumber-4 unstable VRW modes of a vortex ring reminiscent of a mature hurricane are extracted, and their relation with the polygonal eyewalls, mesovortices, and the asymmetric eyewall contraction are established in consistency with results previously obtained from other authors.
    publisherAmerican Meteorological Society
    titleOn the Dynamics of Two-Dimensional Hurricane-Like Vortex Symmetrization
    typeJournal Paper
    journal volume67
    journal issue11
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/2010JAS3499.1
    journal fristpage3559
    journal lastpage3580
    treeJournal of the Atmospheric Sciences:;2010:;Volume( 067 ):;issue: 011
    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