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    Propagating Annular Modes: Empirical Orthogonal Functions, Principal Oscillation Patterns, and Time Scales

    Source: Journal of the Atmospheric Sciences:;2017:;Volume( 074 ):;issue: 005::page 1345
    Author:
    Sheshadri, Aditi
    ,
    Plumb, R. Alan
    DOI: 10.1175/JAS-D-16-0291.1
    Publisher: American Meteorological Society
    Abstract: he two leading empirical orthogonal functions (EOFs) of zonal-mean zonal wind describe north?south fluctuations, and intensification and narrowing, respectively, of the midlatitude jet. Under certain circumstances, these two leading EOFs cannot be regarded as independent but are in fact manifestations of a single, coupled, underlying mode of the dynamical system describing the evolution in time of zonal wind anomalies. The true modes are revealed by the principal oscillation patterns (POPs). The leading mode and its associated eigenvalue are complex, its structure involves at least two EOFs, and it describes poleward (or equatorward) propagation of zonal-mean zonal wind anomalies. In this propagating regime, the principal component (PC) time series associated with the two leading EOFs decay nonexponentially, and the response of the system to external forcing in a given EOF does not depend solely on the PC decorrelation time nor on the projection of the forcing onto that EOF. These considerations are illustrated using results from an idealized dynamical core model. Results from Southern Hemisphere ERA-Interim data are partly consistent with the behavior of the model?s propagating regime. Among other things, these results imply that the time scale that determines the sensitivity of a model to external forcing might be different from the decorrelation time of the leading PC and involves both the rate of decay of the dynamical mode and the period associated with propagation.
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      Propagating Annular Modes: Empirical Orthogonal Functions, Principal Oscillation Patterns, and Time Scales

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    contributor authorSheshadri, Aditi
    contributor authorPlumb, R. Alan
    date accessioned2017-06-09T16:59:55Z
    date available2017-06-09T16:59:55Z
    date copyright2017/05/01
    date issued2017
    identifier issn0022-4928
    identifier otherams-77649.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4220230
    description abstracthe two leading empirical orthogonal functions (EOFs) of zonal-mean zonal wind describe north?south fluctuations, and intensification and narrowing, respectively, of the midlatitude jet. Under certain circumstances, these two leading EOFs cannot be regarded as independent but are in fact manifestations of a single, coupled, underlying mode of the dynamical system describing the evolution in time of zonal wind anomalies. The true modes are revealed by the principal oscillation patterns (POPs). The leading mode and its associated eigenvalue are complex, its structure involves at least two EOFs, and it describes poleward (or equatorward) propagation of zonal-mean zonal wind anomalies. In this propagating regime, the principal component (PC) time series associated with the two leading EOFs decay nonexponentially, and the response of the system to external forcing in a given EOF does not depend solely on the PC decorrelation time nor on the projection of the forcing onto that EOF. These considerations are illustrated using results from an idealized dynamical core model. Results from Southern Hemisphere ERA-Interim data are partly consistent with the behavior of the model?s propagating regime. Among other things, these results imply that the time scale that determines the sensitivity of a model to external forcing might be different from the decorrelation time of the leading PC and involves both the rate of decay of the dynamical mode and the period associated with propagation.
    publisherAmerican Meteorological Society
    titlePropagating Annular Modes: Empirical Orthogonal Functions, Principal Oscillation Patterns, and Time Scales
    typeJournal Paper
    journal volume74
    journal issue5
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-16-0291.1
    journal fristpage1345
    journal lastpage1361
    treeJournal of the Atmospheric Sciences:;2017:;Volume( 074 ):;issue: 005
    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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