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    A Seasonal Climatology of Rossby Wave Breaking in the 320–2000-K Layer

    Source: Journal of the Atmospheric Sciences:;2007:;Volume( 064 ):;issue: 006::page 1922
    Author:
    Hitchman, Matthew H.
    ,
    Huesmann, Amihan S.
    DOI: 10.1175/JAS3927.1
    Publisher: American Meteorological Society
    Abstract: Differential advection in Rossby waves can lead to potential vorticity (PV; P) contours on isentropic surfaces folding over in latitude (Py < 0) in a process called Rossby wave breaking (RWB). Exploring the properties of RWB may shed light on underlying dynamics and enable quantification of irreversible transport. A seasonal climatology of Py and RWB statistics is presented for the 320?850-K layer using NCEP reanalysis data during 1979?2005 and for the 320?2000-K layer using the Met Office (UKMO) data during 1991?2003. A primary goal is to depict the spatial extent and seasonality of RWB maxima. This analysis shows seven distinct RWB regimes: poleward and equatorward of the subtropical westerly jets, poleward and equatorward of the stratospheric polar night jets, flanking the equator in the stratosphere and mesosphere, equatorward of subtropical monsoon anticyclones, and the summertime polar stratosphere. A striking PV gradient maximum exists at the equator throughout the layer 360?2000 K, flanked by subtropical RWB maxima, integral components of the Lagrangian cross-equatorial flow. Strong RWB occurs in the polar night vortex where ? is small. Over the summer pole, strong poleward RWB associated with synoptic waves decays into small amplitude motions in the upper stratosphere, where heating gradients cause Py < 0. The seven spatial regimes are linked to three different dynamical causes of reversals: wave breaking associated with westerly jets, a combined barotropic/inertial instability in cross-equatorial flow, and on the periphery of monsoon anticyclones.
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      A Seasonal Climatology of Rossby Wave Breaking in the 320–2000-K Layer

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    contributor authorHitchman, Matthew H.
    contributor authorHuesmann, Amihan S.
    date accessioned2017-06-09T16:53:41Z
    date available2017-06-09T16:53:41Z
    date copyright2007/06/01
    date issued2007
    identifier issn0022-4928
    identifier otherams-76110.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4218521
    description abstractDifferential advection in Rossby waves can lead to potential vorticity (PV; P) contours on isentropic surfaces folding over in latitude (Py < 0) in a process called Rossby wave breaking (RWB). Exploring the properties of RWB may shed light on underlying dynamics and enable quantification of irreversible transport. A seasonal climatology of Py and RWB statistics is presented for the 320?850-K layer using NCEP reanalysis data during 1979?2005 and for the 320?2000-K layer using the Met Office (UKMO) data during 1991?2003. A primary goal is to depict the spatial extent and seasonality of RWB maxima. This analysis shows seven distinct RWB regimes: poleward and equatorward of the subtropical westerly jets, poleward and equatorward of the stratospheric polar night jets, flanking the equator in the stratosphere and mesosphere, equatorward of subtropical monsoon anticyclones, and the summertime polar stratosphere. A striking PV gradient maximum exists at the equator throughout the layer 360?2000 K, flanked by subtropical RWB maxima, integral components of the Lagrangian cross-equatorial flow. Strong RWB occurs in the polar night vortex where ? is small. Over the summer pole, strong poleward RWB associated with synoptic waves decays into small amplitude motions in the upper stratosphere, where heating gradients cause Py < 0. The seven spatial regimes are linked to three different dynamical causes of reversals: wave breaking associated with westerly jets, a combined barotropic/inertial instability in cross-equatorial flow, and on the periphery of monsoon anticyclones.
    publisherAmerican Meteorological Society
    titleA Seasonal Climatology of Rossby Wave Breaking in the 320–2000-K Layer
    typeJournal Paper
    journal volume64
    journal issue6
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS3927.1
    journal fristpage1922
    journal lastpage1940
    treeJournal of the Atmospheric Sciences:;2007:;Volume( 064 ):;issue: 006
    contenttypeFulltext
    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian
     
    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian