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    Inert Trace Constituent Transport in Sigma and Hybrid Isentropic–Sigma Models. Part I: Nine Advection Algorithms

    Source: Monthly Weather Review:;1999:;volume( 127 ):;issue: 002::page 173
    Author:
    Reames, Fred M.
    ,
    Zapotocny, Tom H.
    DOI: 10.1175/1520-0493(1999)127<0173:ITCTIS>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The University of Wisconsin hybrid isentropic?sigma (??σ) coordinate channel model and the nominally identical sigma (σ) model are used to test the relative capabilities of nine trace constituent transport algorithms. The nine are ?standard? second-order finite differencing, the standard with two local ?borrow and fill? fixers, the standard with a global fixer, four conservative flux-integrated approaches, and the conservation of second-order moments (CSOM). Transport of two analytically specified initial trace constituent distributions is simulated within a common initial atmosphere, which includes a baroclinically amplifying synoptic-scale wave. Two different vertical resolution ??σ models and four vertical resolution σ models provide excellent test beds for comparison of the transport algorithms because their 48-h predictions of standard synoptic fields are virtually identical. Although no analytic solution exists against which detailed comparisons can be made, the constraint of adiabatic conditions for a continuum provides that the maximum of a trace constituent within explicit or implicit isentropic layers of a model should be conserved throughout the simulations, and that the area between any two trace constituent contours on an isentropic surface should remain constant. With these conditions as bases of comparison, several results are unambiguous. First, in the σ models the standard with fixers is better than the other schemes except for the CSOM at the highest resolution. Second, in the ??σ models, the piecewise parabolic and CSOM schemes produce results approximately as accurate as the standard with fixers. Third, when comparing all algorithms, models, resolutions, and distributions, the CSOM scheme produces the most consistent results. Finally, for a large majority of the cases, the ??σ models perform more accurately than the σ models with respect to the conservation of constituent extrema.
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      Inert Trace Constituent Transport in Sigma and Hybrid Isentropic–Sigma Models. Part I: Nine Advection Algorithms

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4204221
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    contributor authorReames, Fred M.
    contributor authorZapotocny, Tom H.
    date accessioned2017-06-09T16:12:15Z
    date available2017-06-09T16:12:15Z
    date copyright1999/02/01
    date issued1999
    identifier issn0027-0644
    identifier otherams-63240.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4204221
    description abstractThe University of Wisconsin hybrid isentropic?sigma (??σ) coordinate channel model and the nominally identical sigma (σ) model are used to test the relative capabilities of nine trace constituent transport algorithms. The nine are ?standard? second-order finite differencing, the standard with two local ?borrow and fill? fixers, the standard with a global fixer, four conservative flux-integrated approaches, and the conservation of second-order moments (CSOM). Transport of two analytically specified initial trace constituent distributions is simulated within a common initial atmosphere, which includes a baroclinically amplifying synoptic-scale wave. Two different vertical resolution ??σ models and four vertical resolution σ models provide excellent test beds for comparison of the transport algorithms because their 48-h predictions of standard synoptic fields are virtually identical. Although no analytic solution exists against which detailed comparisons can be made, the constraint of adiabatic conditions for a continuum provides that the maximum of a trace constituent within explicit or implicit isentropic layers of a model should be conserved throughout the simulations, and that the area between any two trace constituent contours on an isentropic surface should remain constant. With these conditions as bases of comparison, several results are unambiguous. First, in the σ models the standard with fixers is better than the other schemes except for the CSOM at the highest resolution. Second, in the ??σ models, the piecewise parabolic and CSOM schemes produce results approximately as accurate as the standard with fixers. Third, when comparing all algorithms, models, resolutions, and distributions, the CSOM scheme produces the most consistent results. Finally, for a large majority of the cases, the ??σ models perform more accurately than the σ models with respect to the conservation of constituent extrema.
    publisherAmerican Meteorological Society
    titleInert Trace Constituent Transport in Sigma and Hybrid Isentropic–Sigma Models. Part I: Nine Advection Algorithms
    typeJournal Paper
    journal volume127
    journal issue2
    journal titleMonthly Weather Review
    identifier doi10.1175/1520-0493(1999)127<0173:ITCTIS>2.0.CO;2
    journal fristpage173
    journal lastpage187
    treeMonthly Weather Review:;1999:;volume( 127 ):;issue: 002
    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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