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    Application of Two-Dimensional Terrain Height Spectra to Mesoscale Modeling

    Source: Journal of the Atmospheric Sciences:;1985:;Volume( 042 ):;issue: 024::page 2884
    Author:
    Steyn, D. G.
    ,
    Ayotte, K. W.
    DOI: 10.1175/1520-0469(1985)042<2884:AOTDTH>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: A caution is offered with regard to the use of one-dimensional terrain spectra to indicate the grid resolution needed to resolve terrain forcing in mesoscale numerical modeling exercises. To illustrate this, two-dimensional terrain height spectra are presented for two contrasting terrains: a relatively direction free topography (a portion of southcentral British Columbia, Canada) and a highly ordered topography (a portion of the ridge and valley terrain in Pennsylvania). Isoamplitude plots of the two spectra show clearly the morphological differences between the two regions and indicate the degree of directionality of the ordered terrain. An investigation of the wavenumber dependence of the terrain height spectra shows the spectral roll-off for the first case to be essentially independent of direction and to decay roughly as wavenumber to the -5/2 power over a wavenumber range of 0.04 to 8.33 km?1. By contrast, the spectral roll-off in the second case is strongly dependent on direction with an exponent that may be either greater than or less than the convergence limit (?2.0 for the amplitude spectrum) indicated by Young and Pielke.
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      Application of Two-Dimensional Terrain Height Spectra to Mesoscale Modeling

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4155292
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    contributor authorSteyn, D. G.
    contributor authorAyotte, K. W.
    date accessioned2017-06-09T14:26:08Z
    date available2017-06-09T14:26:08Z
    date copyright1985/12/01
    date issued1985
    identifier issn0022-4928
    identifier otherams-19201.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4155292
    description abstractA caution is offered with regard to the use of one-dimensional terrain spectra to indicate the grid resolution needed to resolve terrain forcing in mesoscale numerical modeling exercises. To illustrate this, two-dimensional terrain height spectra are presented for two contrasting terrains: a relatively direction free topography (a portion of southcentral British Columbia, Canada) and a highly ordered topography (a portion of the ridge and valley terrain in Pennsylvania). Isoamplitude plots of the two spectra show clearly the morphological differences between the two regions and indicate the degree of directionality of the ordered terrain. An investigation of the wavenumber dependence of the terrain height spectra shows the spectral roll-off for the first case to be essentially independent of direction and to decay roughly as wavenumber to the -5/2 power over a wavenumber range of 0.04 to 8.33 km?1. By contrast, the spectral roll-off in the second case is strongly dependent on direction with an exponent that may be either greater than or less than the convergence limit (?2.0 for the amplitude spectrum) indicated by Young and Pielke.
    publisherAmerican Meteorological Society
    titleApplication of Two-Dimensional Terrain Height Spectra to Mesoscale Modeling
    typeJournal Paper
    journal volume42
    journal issue24
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1985)042<2884:AOTDTH>2.0.CO;2
    journal fristpage2884
    journal lastpage2887
    treeJournal of the Atmospheric Sciences:;1985:;Volume( 042 ):;issue: 024
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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