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    Interaction of Low- and High-Frequency Transients in a Forecast Experiment with a General Circulation Model

    Source: Journal of the Atmospheric Sciences:;1988:;Volume( 046 ):;issue: 010::page 1411
    Author:
    Kushnir, Yochanan
    ,
    Wallace, John M.
    DOI: 10.1175/1520-0469(1989)046<1411:IOLAHF>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Two sets of 15-day numerical forecasts are performed with a general circulation model to examine aspects of the mutual interaction between high-frequency, baroclinic-wave variability and the low-frequency components of the atmospheric flow. A control run based on an initial field, arbitrarily chosen from the history tapes of a previous model integration and a forecast based on a time-filtered version of the same initial state are compared. The results indicate that the high-frequency variability of the flow in the latter forecast returns to normal amplitudes about one week after the initialization time, at which state it is only weakly correlated in space with the high-frequency component of the flow in the control run. The low-frequency components of the flow seems to behave differently depending on their zonal scale: Ultralong waves (wavenumber 1?3) are only weakly affected by the removal of the baroclinic activity from the initial conditions, while long waves (wavenumber 4?6) react to the removal of the baroclinic waves by drifting eastward faster than their counterparts in the control run.
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      Interaction of Low- and High-Frequency Transients in a Forecast Experiment with a General Circulation Model

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4156263
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    contributor authorKushnir, Yochanan
    contributor authorWallace, John M.
    date accessioned2017-06-09T14:28:57Z
    date available2017-06-09T14:28:57Z
    date copyright1989/05/01
    date issued1988
    identifier issn0022-4928
    identifier otherams-20075.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4156263
    description abstractTwo sets of 15-day numerical forecasts are performed with a general circulation model to examine aspects of the mutual interaction between high-frequency, baroclinic-wave variability and the low-frequency components of the atmospheric flow. A control run based on an initial field, arbitrarily chosen from the history tapes of a previous model integration and a forecast based on a time-filtered version of the same initial state are compared. The results indicate that the high-frequency variability of the flow in the latter forecast returns to normal amplitudes about one week after the initialization time, at which state it is only weakly correlated in space with the high-frequency component of the flow in the control run. The low-frequency components of the flow seems to behave differently depending on their zonal scale: Ultralong waves (wavenumber 1?3) are only weakly affected by the removal of the baroclinic activity from the initial conditions, while long waves (wavenumber 4?6) react to the removal of the baroclinic waves by drifting eastward faster than their counterparts in the control run.
    publisherAmerican Meteorological Society
    titleInteraction of Low- and High-Frequency Transients in a Forecast Experiment with a General Circulation Model
    typeJournal Paper
    journal volume46
    journal issue10
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1989)046<1411:IOLAHF>2.0.CO;2
    journal fristpage1411
    journal lastpage1418
    treeJournal of the Atmospheric Sciences:;1988:;Volume( 046 ):;issue: 010
    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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