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    Representing Drag on Unresolved Terrain as a Distributed Momentum Sink

    Source: Journal of the Atmospheric Sciences:;2002:;Volume( 059 ):;issue: 009::page 1629
    Author:
    Wilson, John D.
    DOI: 10.1175/1520-0469(2002)059<1629:RDOUTA>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: In numerical weather prediction models, drag on unresolved terrain is usually represented by augmenting the boundary drag on the model atmosphere, in terms of an effective surface roughness length. But as is shown here, if a terrain-following coordinate is defined relative to smoothed terrain, the residual unresolved terrain component implies a volumetric momentum sink, as recently implemented in the Canadian Climate Centre GCM, and as is implicit in the ?orographic-stress profile? method. Thus treating drag on unresolved terrain by way of an internal (rather than enhanced surface) momentum sink is a better method in principle. While the skill of both methods hinges on limited fundamental knowledge of drag on terrain, a distributed momentum sink arguably offers greater flexibility to improve modeling of mountain winds, if necessary by tailoring the sink to achieve success, in specific regions, by trial and error. A consequence of the new method is that unresolved terrain results in a ground-based (stress divergence) layer, that is somewhat analogous to a plant canopy layer, from the point of view of its momentum balance.
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      Representing Drag on Unresolved Terrain as a Distributed Momentum Sink

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4159633
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    contributor authorWilson, John D.
    date accessioned2017-06-09T14:37:40Z
    date available2017-06-09T14:37:40Z
    date copyright2002/05/01
    date issued2002
    identifier issn0022-4928
    identifier otherams-23108.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4159633
    description abstractIn numerical weather prediction models, drag on unresolved terrain is usually represented by augmenting the boundary drag on the model atmosphere, in terms of an effective surface roughness length. But as is shown here, if a terrain-following coordinate is defined relative to smoothed terrain, the residual unresolved terrain component implies a volumetric momentum sink, as recently implemented in the Canadian Climate Centre GCM, and as is implicit in the ?orographic-stress profile? method. Thus treating drag on unresolved terrain by way of an internal (rather than enhanced surface) momentum sink is a better method in principle. While the skill of both methods hinges on limited fundamental knowledge of drag on terrain, a distributed momentum sink arguably offers greater flexibility to improve modeling of mountain winds, if necessary by tailoring the sink to achieve success, in specific regions, by trial and error. A consequence of the new method is that unresolved terrain results in a ground-based (stress divergence) layer, that is somewhat analogous to a plant canopy layer, from the point of view of its momentum balance.
    publisherAmerican Meteorological Society
    titleRepresenting Drag on Unresolved Terrain as a Distributed Momentum Sink
    typeJournal Paper
    journal volume59
    journal issue9
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(2002)059<1629:RDOUTA>2.0.CO;2
    journal fristpage1629
    journal lastpage1637
    treeJournal of the Atmospheric Sciences:;2002:;Volume( 059 ):;issue: 009
    contenttypeFulltext
    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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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian