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    Intermittent African Easterly Wave Activity in a Dry Atmospheric Model: Influence of the Extratropics

    Source: Journal of Climate:;2011:;volume( 024 ):;issue: 020::page 5378
    Author:
    Leroux, Stephanie
    ,
    Hall, Nicholas M. J.
    ,
    Kiladis, George N.
    DOI: 10.1175/JCLI-D-11-00049.1
    Publisher: American Meteorological Society
    Abstract: dynamical model is constructed of the northern summertime global circulation, maintained by empirically derived forcing, based on the same dynamical code that has recently been used to study African easterly waves (AEWs) as convectively triggered perturbations (Thorncroft et al.; Leroux and Hall). In the configuration used here, the model faithfully simulates the observed mean distributions of jets and transient disturbances, and explicitly represents the interactions between them. This simple GCM is used to investigate the origin and intraseasonal intermittency of AEWs in an artificially dry (no convection) context. A long integration of the model produces a summertime climatology that includes a realistic African easterly jet and westward-propagating 3?5-day disturbances over West Africa. These simulated waves display intraseasonal intermittency as the observed AEWs also do. Further experiments designed to discern the source of this intermittency in the model show that the simulated waves are mainly triggered by dynamical precursors coming from the North Atlantic storm track. The model is at least as sensitive to this remote influence as it is to local triggering by convective heating.
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      Intermittent African Easterly Wave Activity in a Dry Atmospheric Model: Influence of the Extratropics

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4221560
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    contributor authorLeroux, Stephanie
    contributor authorHall, Nicholas M. J.
    contributor authorKiladis, George N.
    date accessioned2017-06-09T17:03:55Z
    date available2017-06-09T17:03:55Z
    date copyright2011/10/01
    date issued2011
    identifier issn0894-8755
    identifier otherams-78846.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4221560
    description abstractdynamical model is constructed of the northern summertime global circulation, maintained by empirically derived forcing, based on the same dynamical code that has recently been used to study African easterly waves (AEWs) as convectively triggered perturbations (Thorncroft et al.; Leroux and Hall). In the configuration used here, the model faithfully simulates the observed mean distributions of jets and transient disturbances, and explicitly represents the interactions between them. This simple GCM is used to investigate the origin and intraseasonal intermittency of AEWs in an artificially dry (no convection) context. A long integration of the model produces a summertime climatology that includes a realistic African easterly jet and westward-propagating 3?5-day disturbances over West Africa. These simulated waves display intraseasonal intermittency as the observed AEWs also do. Further experiments designed to discern the source of this intermittency in the model show that the simulated waves are mainly triggered by dynamical precursors coming from the North Atlantic storm track. The model is at least as sensitive to this remote influence as it is to local triggering by convective heating.
    publisherAmerican Meteorological Society
    titleIntermittent African Easterly Wave Activity in a Dry Atmospheric Model: Influence of the Extratropics
    typeJournal Paper
    journal volume24
    journal issue20
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-11-00049.1
    journal fristpage5378
    journal lastpage5396
    treeJournal of Climate:;2011:;volume( 024 ):;issue: 020
    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
    yabeshDSpacePersian