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    FURTHER TESTS OF A GRID SYSTEM FOR GLOBAL NUMERICAL PREDICTION

    Source: Monthly Weather Review:;1971:;volume( 099 ):;issue: 009::page 686
    Author:
    UMSCHEID, LUDWIG
    ,
    SANKAR-RAO, M.
    DOI: 10.1175/1520-0493(1971)099<0686:FTOAGS>2.3.CO;2
    Publisher: American Meteorological Society
    Abstract: Two smoothing techniques are tested as a practical means of allowing a larger time step in the numerical integration of a primitive equation free-surface model. The numerical integration uses a finite-difference grid and operators based on the method of Kurihara and Holloway. A time step six times larger can be used with a corresponding six-fold decrease in computer time, by implementing the weighted averaging procedure given by Langlois and Kwok in their description of the Mintz-Arakawa general circulation model. A Fourier filtering scheme permits the use of a time step 10 times larger, and results in a five-fold improvement in computer time. After 10 days, the geopotential and wind fields obtained with these techniques still closely resemble the unsmoothed fields, the closest correspondence being found with the Fourier filtering technique. In another set of experiments, steady-state solutions to special cases of the governing analytic equations are used as initial conditions in a test of the accuracy of the grid and operators. These steady-state solutions are preserved satisfactorily for the 10-day integration period.
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      FURTHER TESTS OF A GRID SYSTEM FOR GLOBAL NUMERICAL PREDICTION

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4198791
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    • Monthly Weather Review

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    contributor authorUMSCHEID, LUDWIG
    contributor authorSANKAR-RAO, M.
    date accessioned2017-06-09T15:59:44Z
    date available2017-06-09T15:59:44Z
    date copyright1971/09/01
    date issued1971
    identifier issn0027-0644
    identifier otherams-58353.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4198791
    description abstractTwo smoothing techniques are tested as a practical means of allowing a larger time step in the numerical integration of a primitive equation free-surface model. The numerical integration uses a finite-difference grid and operators based on the method of Kurihara and Holloway. A time step six times larger can be used with a corresponding six-fold decrease in computer time, by implementing the weighted averaging procedure given by Langlois and Kwok in their description of the Mintz-Arakawa general circulation model. A Fourier filtering scheme permits the use of a time step 10 times larger, and results in a five-fold improvement in computer time. After 10 days, the geopotential and wind fields obtained with these techniques still closely resemble the unsmoothed fields, the closest correspondence being found with the Fourier filtering technique. In another set of experiments, steady-state solutions to special cases of the governing analytic equations are used as initial conditions in a test of the accuracy of the grid and operators. These steady-state solutions are preserved satisfactorily for the 10-day integration period.
    publisherAmerican Meteorological Society
    titleFURTHER TESTS OF A GRID SYSTEM FOR GLOBAL NUMERICAL PREDICTION
    typeJournal Paper
    journal volume99
    journal issue9
    journal titleMonthly Weather Review
    identifier doi10.1175/1520-0493(1971)099<0686:FTOAGS>2.3.CO;2
    journal fristpage686
    journal lastpage690
    treeMonthly Weather Review:;1971:;volume( 099 ):;issue: 009
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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