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    The Diabatic Contour Advective Semi-Lagrangian Model

    Source: Monthly Weather Review:;2006:;volume( 134 ):;issue: 009::page 2503
    Author:
    Dritschel, David G.
    ,
    Ambaum, Maarten H. P.
    DOI: 10.1175/MWR3202.1
    Publisher: American Meteorological Society
    Abstract: This article describes a novel algorithmic development extending the contour advective semi-Lagrangian model to include nonconservative effects. The Lagrangian contour representation of finescale tracer fields, such as potential vorticity, allows for conservative, nondiffusive treatment of sharp gradients allowing very high numerical Reynolds numbers. It has been widely employed in accurate geostrophic turbulence and tracer advection simulations. In the present, diabatic version of the model the constraint of conservative dynamics is overcome by including a parallel Eulerian field that absorbs the nonconservative (diabatic) tendencies. The diabatic buildup in this Eulerian field is limited through regular, controlled transfers of this field to the contour representation. This transfer is done with a fast newly developed contouring algorithm. This model has been implemented for several idealized geometries. In this paper a single-layer doubly periodic geometry is used to demonstrate the validity of the model. The present model converges faster than the analogous semi-Lagrangian models at increased resolutions. At the same nominal spatial resolution the new model is 40 times faster than the analogous semi-Lagrangian model. Results of an orographically forced idealized storm track show nontrivial dependency of storm-track statistics on resolution and on the numerical model employed. If this result is more generally applicable, this may have important consequences for future high-resolution climate modeling.
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      The Diabatic Contour Advective Semi-Lagrangian Model

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4229230
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    contributor authorDritschel, David G.
    contributor authorAmbaum, Maarten H. P.
    date accessioned2017-06-09T17:27:56Z
    date available2017-06-09T17:27:56Z
    date copyright2006/09/01
    date issued2006
    identifier issn0027-0644
    identifier otherams-85749.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4229230
    description abstractThis article describes a novel algorithmic development extending the contour advective semi-Lagrangian model to include nonconservative effects. The Lagrangian contour representation of finescale tracer fields, such as potential vorticity, allows for conservative, nondiffusive treatment of sharp gradients allowing very high numerical Reynolds numbers. It has been widely employed in accurate geostrophic turbulence and tracer advection simulations. In the present, diabatic version of the model the constraint of conservative dynamics is overcome by including a parallel Eulerian field that absorbs the nonconservative (diabatic) tendencies. The diabatic buildup in this Eulerian field is limited through regular, controlled transfers of this field to the contour representation. This transfer is done with a fast newly developed contouring algorithm. This model has been implemented for several idealized geometries. In this paper a single-layer doubly periodic geometry is used to demonstrate the validity of the model. The present model converges faster than the analogous semi-Lagrangian models at increased resolutions. At the same nominal spatial resolution the new model is 40 times faster than the analogous semi-Lagrangian model. Results of an orographically forced idealized storm track show nontrivial dependency of storm-track statistics on resolution and on the numerical model employed. If this result is more generally applicable, this may have important consequences for future high-resolution climate modeling.
    publisherAmerican Meteorological Society
    titleThe Diabatic Contour Advective Semi-Lagrangian Model
    typeJournal Paper
    journal volume134
    journal issue9
    journal titleMonthly Weather Review
    identifier doi10.1175/MWR3202.1
    journal fristpage2503
    journal lastpage2514
    treeMonthly Weather Review:;2006:;volume( 134 ):;issue: 009
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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