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    On the Relationship between African Easterly Waves and the African Easterly Jet

    Source: Journal of the Atmospheric Sciences:;2009:;Volume( 066 ):;issue: 008::page 2303
    Author:
    Leroux, Stephanie
    ,
    Hall, Nicholas M. J.
    DOI: 10.1175/2009JAS2988.1
    Publisher: American Meteorological Society
    Abstract: This idealized modeling study investigates how convectively triggered African easterly waves (AEWs) are influenced by the intraseasonal variability of the African easterly jet (AEJ). A set of 10-day averaged zonally varying basic states is constructed with the NCEP-2 reanalysis (1979?2006). A primitive equation model is used to simulate linear AEWs on each of these basic states using the same idealized convective heating localized over the Darfur mountains as an initial trigger. It is shown that the transient response depends strongly on the basic state. With the same trigger, many configurations of the AEJ fail to produce a wave disturbance, while others produce strong easterly wave structures. Necessary conditions for the development of strong waves can be characterized by a strong jet, a strong vertical shear, or a strong and extended potential vorticity reversal. In strong-wave cases the jet is extended to the south and west, and the jet core is aligned with the maximum of surface westerlies, maximizing the vertical shear. The pattern that is optimal for generating easterly waves also closely resembles the dominant mode of variation of the AEJ revealed by an empirical orthogonal function (EOF) analysis of the set of basic states.
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      On the Relationship between African Easterly Waves and the African Easterly Jet

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4209995
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    contributor authorLeroux, Stephanie
    contributor authorHall, Nicholas M. J.
    date accessioned2017-06-09T16:28:12Z
    date available2017-06-09T16:28:12Z
    date copyright2009/08/01
    date issued2009
    identifier issn0022-4928
    identifier otherams-68437.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4209995
    description abstractThis idealized modeling study investigates how convectively triggered African easterly waves (AEWs) are influenced by the intraseasonal variability of the African easterly jet (AEJ). A set of 10-day averaged zonally varying basic states is constructed with the NCEP-2 reanalysis (1979?2006). A primitive equation model is used to simulate linear AEWs on each of these basic states using the same idealized convective heating localized over the Darfur mountains as an initial trigger. It is shown that the transient response depends strongly on the basic state. With the same trigger, many configurations of the AEJ fail to produce a wave disturbance, while others produce strong easterly wave structures. Necessary conditions for the development of strong waves can be characterized by a strong jet, a strong vertical shear, or a strong and extended potential vorticity reversal. In strong-wave cases the jet is extended to the south and west, and the jet core is aligned with the maximum of surface westerlies, maximizing the vertical shear. The pattern that is optimal for generating easterly waves also closely resembles the dominant mode of variation of the AEJ revealed by an empirical orthogonal function (EOF) analysis of the set of basic states.
    publisherAmerican Meteorological Society
    titleOn the Relationship between African Easterly Waves and the African Easterly Jet
    typeJournal Paper
    journal volume66
    journal issue8
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/2009JAS2988.1
    journal fristpage2303
    journal lastpage2316
    treeJournal of the Atmospheric Sciences:;2009:;Volume( 066 ):;issue: 008
    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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