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    The Dynamic Response of the Hurricane Wind Field to Spiral Rainband Heating

    Source: Journal of the Atmospheric Sciences:;2010:;Volume( 067 ):;issue: 006::page 1779
    Author:
    Moon, Yumin
    ,
    Nolan, David S.
    DOI: 10.1175/2010JAS3171.1
    Publisher: American Meteorological Society
    Abstract: The response of the hurricane wind field to spiral rainband heating is examined by using a three-dimensional, nonhydrostatic, linear model of the vortex?anelastic equations. Diabatic heat sources, which are designed in accordance with previous observations of spiral rainbands, are made to rotate with the flow around the hurricane-like wind field of a balanced, axisymmetric vortex. Common kinematic features are recovered, such as the overturning secondary circulation, descending midlevel radial inflow, and cyclonically accelerated tangential flow on the radially outward side of spiral rainbands. Comparison of the responses to the purely convective and stratiform rainbands indicates that the overturning secondary circulation is mostly due to the convective part of the rainband and is stronger in the upwind region, while midlevel radial inflow descending to the surface is due to the stratiform characteristics of the rainband and is stronger in the downwind region. The secondary horizontal wind maximum is exhibited in both convective and stratiform parts of the rainband, but it tends to be stronger in the downwind region. The results indicate that the primary effects of rainbands on the hurricane wind field are caused by the direct response to diabatic heating in convection embedded in them and that the structure of the diabatic heating is primarily responsible for their unique kinematic structures. Sensitivity tests confirm the robustness of the results. In addition, the response of the hurricane wind field to the rainband heating is, in the linear limit, the sum of the asymmetric potential vorticity and symmetric transverse circulations.
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      The Dynamic Response of the Hurricane Wind Field to Spiral Rainband Heating

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4211895
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    contributor authorMoon, Yumin
    contributor authorNolan, David S.
    date accessioned2017-06-09T16:34:09Z
    date available2017-06-09T16:34:09Z
    date copyright2010/06/01
    date issued2010
    identifier issn0022-4928
    identifier otherams-70146.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4211895
    description abstractThe response of the hurricane wind field to spiral rainband heating is examined by using a three-dimensional, nonhydrostatic, linear model of the vortex?anelastic equations. Diabatic heat sources, which are designed in accordance with previous observations of spiral rainbands, are made to rotate with the flow around the hurricane-like wind field of a balanced, axisymmetric vortex. Common kinematic features are recovered, such as the overturning secondary circulation, descending midlevel radial inflow, and cyclonically accelerated tangential flow on the radially outward side of spiral rainbands. Comparison of the responses to the purely convective and stratiform rainbands indicates that the overturning secondary circulation is mostly due to the convective part of the rainband and is stronger in the upwind region, while midlevel radial inflow descending to the surface is due to the stratiform characteristics of the rainband and is stronger in the downwind region. The secondary horizontal wind maximum is exhibited in both convective and stratiform parts of the rainband, but it tends to be stronger in the downwind region. The results indicate that the primary effects of rainbands on the hurricane wind field are caused by the direct response to diabatic heating in convection embedded in them and that the structure of the diabatic heating is primarily responsible for their unique kinematic structures. Sensitivity tests confirm the robustness of the results. In addition, the response of the hurricane wind field to the rainband heating is, in the linear limit, the sum of the asymmetric potential vorticity and symmetric transverse circulations.
    publisherAmerican Meteorological Society
    titleThe Dynamic Response of the Hurricane Wind Field to Spiral Rainband Heating
    typeJournal Paper
    journal volume67
    journal issue6
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/2010JAS3171.1
    journal fristpage1779
    journal lastpage1805
    treeJournal of the Atmospheric Sciences:;2010:;Volume( 067 ):;issue: 006
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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