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    Dynamics of Orographic Gravity Waves Observed in the Mesosphere over the Auckland Islands during the Deep Propagating Gravity Wave Experiment (DEEPWAVE)

    Source: Journal of the Atmospheric Sciences:;2016:;Volume( 073 ):;issue: 010::page 3855
    Author:
    Eckermann, Stephen D.
    ,
    Broutman, Dave
    ,
    Ma, Jun
    ,
    Doyle, James D.
    ,
    Pautet, Pierre-Dominique
    ,
    Taylor, Michael J.
    ,
    Bossert, Katrina
    ,
    Williams, Bifford P.
    ,
    Fritts, David C.
    ,
    Smith, Ronald B.
    DOI: 10.1175/JAS-D-16-0059.1
    Publisher: American Meteorological Society
    Abstract: n 14 July 2014 during the Deep Propagating Gravity Wave Experiment (DEEPWAVE), aircraft remote sensing instruments detected large-amplitude gravity wave oscillations within mesospheric airglow and sodium layers at altitudes z ~ 78?83 km downstream of the Auckland Islands, located ~1000 km south of Christchurch, New Zealand. A high-altitude reanalysis and a three-dimensional Fourier gravity wave model are used to investigate the dynamics of this event. At 0700 UTC when the first observations were made, surface flow across the islands? terrain generated linear three-dimensional wave fields that propagated rapidly to z ~ 78 km, where intense breaking occurred in a narrow layer beneath a zero-wind region at z ~ 83 km. In the following hours, the altitude of weak winds descended under the influence of a large-amplitude migrating semidiurnal tide, leading to intense breaking of these wave fields in subsequent observations starting at 1000 UTC. The linear Fourier model constrained by upstream reanalysis reproduces the salient aspects of observed wave fields, including horizontal wavelengths, phase orientations, temperature and vertical displacement amplitudes, heights and locations of incipient wave breaking, and momentum fluxes. Wave breaking has huge effects on local circulations, with inferred layer-averaged westward flow accelerations of ~350 m s?1 h?1 and dynamical heating rates of ~8 K h?1, supporting recent speculation of important impacts of orographic gravity waves from subantarctic islands on the mean circulation and climate of the middle atmosphere during austral winter.
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      Dynamics of Orographic Gravity Waves Observed in the Mesosphere over the Auckland Islands during the Deep Propagating Gravity Wave Experiment (DEEPWAVE)

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4220143
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    • Journal of the Atmospheric Sciences

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    contributor authorEckermann, Stephen D.
    contributor authorBroutman, Dave
    contributor authorMa, Jun
    contributor authorDoyle, James D.
    contributor authorPautet, Pierre-Dominique
    contributor authorTaylor, Michael J.
    contributor authorBossert, Katrina
    contributor authorWilliams, Bifford P.
    contributor authorFritts, David C.
    contributor authorSmith, Ronald B.
    date accessioned2017-06-09T16:59:37Z
    date available2017-06-09T16:59:37Z
    date copyright2016/10/01
    date issued2016
    identifier issn0022-4928
    identifier otherams-77571.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4220143
    description abstractn 14 July 2014 during the Deep Propagating Gravity Wave Experiment (DEEPWAVE), aircraft remote sensing instruments detected large-amplitude gravity wave oscillations within mesospheric airglow and sodium layers at altitudes z ~ 78?83 km downstream of the Auckland Islands, located ~1000 km south of Christchurch, New Zealand. A high-altitude reanalysis and a three-dimensional Fourier gravity wave model are used to investigate the dynamics of this event. At 0700 UTC when the first observations were made, surface flow across the islands? terrain generated linear three-dimensional wave fields that propagated rapidly to z ~ 78 km, where intense breaking occurred in a narrow layer beneath a zero-wind region at z ~ 83 km. In the following hours, the altitude of weak winds descended under the influence of a large-amplitude migrating semidiurnal tide, leading to intense breaking of these wave fields in subsequent observations starting at 1000 UTC. The linear Fourier model constrained by upstream reanalysis reproduces the salient aspects of observed wave fields, including horizontal wavelengths, phase orientations, temperature and vertical displacement amplitudes, heights and locations of incipient wave breaking, and momentum fluxes. Wave breaking has huge effects on local circulations, with inferred layer-averaged westward flow accelerations of ~350 m s?1 h?1 and dynamical heating rates of ~8 K h?1, supporting recent speculation of important impacts of orographic gravity waves from subantarctic islands on the mean circulation and climate of the middle atmosphere during austral winter.
    publisherAmerican Meteorological Society
    titleDynamics of Orographic Gravity Waves Observed in the Mesosphere over the Auckland Islands during the Deep Propagating Gravity Wave Experiment (DEEPWAVE)
    typeJournal Paper
    journal volume73
    journal issue10
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-16-0059.1
    journal fristpage3855
    journal lastpage3876
    treeJournal of the Atmospheric Sciences:;2016:;Volume( 073 ):;issue: 010
    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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