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    Dynamical Prototype of the Arctic Oscillation as Revealed by aNeutral Singular Vector

    Source: Journal of Climate:;2004:;volume( 017 ):;issue: 011::page 2119
    Author:
    Watanabe, Masahiro
    ,
    Jin, Fei-Fei
    DOI: 10.1175/1520-0442(2004)017<2119:DPOTAO>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Origin of the Arctic Oscillation (AO) was explored from a dynamical perspective, using a primitive equation model linearized about the observed winter climatology. In order to obtain a leading low-frequency mode of the model atmosphere, singular vector analysis is performed on the linear dynamical operator. The singular mode (v vector) with the smallest singular value, referred to as the neutral mode, has a considerable similarity to the observed AO in many aspects, suggesting that, at least in a linear dynamical framework, the AO is a dynamically consistent mode of variability that arises from the zonal asymmetry of the time-mean state. Diagnosis of the neutral mode shows that a zonal flow?stationary wave interaction and an interaction between anomalous and climatological stationary waves are both of importance for maintenance of the spatial structure. Besides, vortex stretching?shrinking is significant in the upper levels, which indicates that a baroclinic process has a certain role as well. It is found that the formation of a hemispheric scale of the neutral mode is accomplished within several days via propagation of Rossby wave packets along jet streams that act as a waveguide. The neutral mode structure is robust for a wide range of model damping parameters, and especially preferred when the damping is weakened in the free troposphere. The corresponding optimal forcing (u vector) indicates that, though its robustness is relatively ambiguous, the neutral mode is most effectively excited by a certain pattern of the extratropical thermal forcing, in addition to a modest sensitivity to the deep heating anomaly over the tropical Indian Ocean.
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      Dynamical Prototype of the Arctic Oscillation as Revealed by aNeutral Singular Vector

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4207412
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    contributor authorWatanabe, Masahiro
    contributor authorJin, Fei-Fei
    date accessioned2017-06-09T16:20:34Z
    date available2017-06-09T16:20:34Z
    date copyright2004/06/01
    date issued2004
    identifier issn0894-8755
    identifier otherams-6611.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4207412
    description abstractOrigin of the Arctic Oscillation (AO) was explored from a dynamical perspective, using a primitive equation model linearized about the observed winter climatology. In order to obtain a leading low-frequency mode of the model atmosphere, singular vector analysis is performed on the linear dynamical operator. The singular mode (v vector) with the smallest singular value, referred to as the neutral mode, has a considerable similarity to the observed AO in many aspects, suggesting that, at least in a linear dynamical framework, the AO is a dynamically consistent mode of variability that arises from the zonal asymmetry of the time-mean state. Diagnosis of the neutral mode shows that a zonal flow?stationary wave interaction and an interaction between anomalous and climatological stationary waves are both of importance for maintenance of the spatial structure. Besides, vortex stretching?shrinking is significant in the upper levels, which indicates that a baroclinic process has a certain role as well. It is found that the formation of a hemispheric scale of the neutral mode is accomplished within several days via propagation of Rossby wave packets along jet streams that act as a waveguide. The neutral mode structure is robust for a wide range of model damping parameters, and especially preferred when the damping is weakened in the free troposphere. The corresponding optimal forcing (u vector) indicates that, though its robustness is relatively ambiguous, the neutral mode is most effectively excited by a certain pattern of the extratropical thermal forcing, in addition to a modest sensitivity to the deep heating anomaly over the tropical Indian Ocean.
    publisherAmerican Meteorological Society
    titleDynamical Prototype of the Arctic Oscillation as Revealed by aNeutral Singular Vector
    typeJournal Paper
    journal volume17
    journal issue11
    journal titleJournal of Climate
    identifier doi10.1175/1520-0442(2004)017<2119:DPOTAO>2.0.CO;2
    journal fristpage2119
    journal lastpage2138
    treeJournal of Climate:;2004:;volume( 017 ):;issue: 011
    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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