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    On the Source of Midlatitude Low-Frequency Variability. Part I: A Statistical Approach to Persistence

    Source: Journal of the Atmospheric Sciences:;1988:;Volume( 045 ):;issue: 020::page 2811
    Author:
    Vautard, Robert
    ,
    Legras, Bernard
    ,
    Déqué, Michel
    DOI: 10.1175/1520-0469(1988)045<2811:OTSOML>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The forcing of low-frequency variability by synoptic transient traveling perturbations is investigated within a quasi-geostrophic channel forced by a localized baroclinic jet. Spontaneously generated baroclinic perturbations grow and decay along a storm track; at the end of the track a maximum of low-frequency variability is obtained, in agreement with atmospheric observations. The structure of low-frequency variability is studied with a combination of statistical methods, using a multivariate red noise model as a random reference. We show that the anomalies are preferentially linked with local stationary structures or long-wave vacillations according to their location and their sign. A systematic study of persistence is conducted with a criterion based on rms of the streamfunction variations. The interesting quantity is the probability of persistence which shows a very inhomogeneous distribution in phase space and several separated maxima. The composites based on these maxima exhibit the characters of zonal and blocking regimes. The transient feedback has a positive role in extending the jet downstream but the primary effect is the maintenance of the blocking circulation.
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      On the Source of Midlatitude Low-Frequency Variability. Part I: A Statistical Approach to Persistence

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4156068
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    contributor authorVautard, Robert
    contributor authorLegras, Bernard
    contributor authorDéqué, Michel
    date accessioned2017-06-09T14:28:27Z
    date available2017-06-09T14:28:27Z
    date copyright1988/10/01
    date issued1988
    identifier issn0022-4928
    identifier otherams-19900.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4156068
    description abstractThe forcing of low-frequency variability by synoptic transient traveling perturbations is investigated within a quasi-geostrophic channel forced by a localized baroclinic jet. Spontaneously generated baroclinic perturbations grow and decay along a storm track; at the end of the track a maximum of low-frequency variability is obtained, in agreement with atmospheric observations. The structure of low-frequency variability is studied with a combination of statistical methods, using a multivariate red noise model as a random reference. We show that the anomalies are preferentially linked with local stationary structures or long-wave vacillations according to their location and their sign. A systematic study of persistence is conducted with a criterion based on rms of the streamfunction variations. The interesting quantity is the probability of persistence which shows a very inhomogeneous distribution in phase space and several separated maxima. The composites based on these maxima exhibit the characters of zonal and blocking regimes. The transient feedback has a positive role in extending the jet downstream but the primary effect is the maintenance of the blocking circulation.
    publisherAmerican Meteorological Society
    titleOn the Source of Midlatitude Low-Frequency Variability. Part I: A Statistical Approach to Persistence
    typeJournal Paper
    journal volume45
    journal issue20
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1988)045<2811:OTSOML>2.0.CO;2
    journal fristpage2811
    journal lastpage2844
    treeJournal of the Atmospheric Sciences:;1988:;Volume( 045 ):;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
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