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    Low-Frequency Synoptic-Eddy Activity in the Pacific Storm Track

    Source: Journal of the Atmospheric Sciences:;1993:;Volume( 050 ):;issue: 012::page 1672
    Author:
    Higgins, R. W.
    ,
    Schubert, S. D.
    DOI: 10.1175/1520-0469(1993)050<1672:LFSEAI>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The nature of low-frequency variations in synoptic-eddy activity over the North Pacific is examined in a general circulation model (GCM). A comparison with observations reveals that the GCM produces realistic time mean and low-frequency synoptic-eddy forcing of the 200-mb zonal wind. In the time mean, this forcing, which is computed as the divergence of the extended Eliassen?Palm (E?P) flux, shows an east-west dipole structure that tends to reduce the zonal wind over the western North Pacific and tends to enhance it to the east. This structure is consistent with the general picture of the life cycle of baroclinic waves, which show strong upward and eastward propagation in the western and central Pacific and meridional propagation to the east. The western and central Pacific synoptic-eddy forcing is dominated by the convergence of the baroclinic component of the E?P flux divergence, while over the eastern Pacific the divergence of the barotropic component is important. The dominant component of the low-frequency ?envelope? (periods > 10 days) of synoptic-eddy forcing, computed as the first empirical orthogonal function (EOF) modulates the time mean synoptic-eddy forcing. This modulation is associated with low-frequency changes in the intensity of the synoptic-eddy activity and is only weakly tied to fluctuations in the low-frequency flow. Composites of the hemispheric distribution of synoptic-eddy forcing in the GCM, based on the extremes of the dominant Pacific EOF, show a seesaw behavior with enhanced eddy forcing in the North Pacific basin associated with suppressed forcing in the North Atlantic basin, and vice versa. The link between the Pacific and the Atlantic basins appears to be due to the presence of eastward-traveling baroclinic wave packets that travel around the globe with a period of about 10 days. Some evidence is found for a similar behavior in the observations.
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      Low-Frequency Synoptic-Eddy Activity in the Pacific Storm Track

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4157217
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    • Journal of the Atmospheric Sciences

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    contributor authorHiggins, R. W.
    contributor authorSchubert, S. D.
    date accessioned2017-06-09T14:31:32Z
    date available2017-06-09T14:31:32Z
    date copyright1993/06/01
    date issued1993
    identifier issn0022-4928
    identifier otherams-20934.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4157217
    description abstractThe nature of low-frequency variations in synoptic-eddy activity over the North Pacific is examined in a general circulation model (GCM). A comparison with observations reveals that the GCM produces realistic time mean and low-frequency synoptic-eddy forcing of the 200-mb zonal wind. In the time mean, this forcing, which is computed as the divergence of the extended Eliassen?Palm (E?P) flux, shows an east-west dipole structure that tends to reduce the zonal wind over the western North Pacific and tends to enhance it to the east. This structure is consistent with the general picture of the life cycle of baroclinic waves, which show strong upward and eastward propagation in the western and central Pacific and meridional propagation to the east. The western and central Pacific synoptic-eddy forcing is dominated by the convergence of the baroclinic component of the E?P flux divergence, while over the eastern Pacific the divergence of the barotropic component is important. The dominant component of the low-frequency ?envelope? (periods > 10 days) of synoptic-eddy forcing, computed as the first empirical orthogonal function (EOF) modulates the time mean synoptic-eddy forcing. This modulation is associated with low-frequency changes in the intensity of the synoptic-eddy activity and is only weakly tied to fluctuations in the low-frequency flow. Composites of the hemispheric distribution of synoptic-eddy forcing in the GCM, based on the extremes of the dominant Pacific EOF, show a seesaw behavior with enhanced eddy forcing in the North Pacific basin associated with suppressed forcing in the North Atlantic basin, and vice versa. The link between the Pacific and the Atlantic basins appears to be due to the presence of eastward-traveling baroclinic wave packets that travel around the globe with a period of about 10 days. Some evidence is found for a similar behavior in the observations.
    publisherAmerican Meteorological Society
    titleLow-Frequency Synoptic-Eddy Activity in the Pacific Storm Track
    typeJournal Paper
    journal volume50
    journal issue12
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1993)050<1672:LFSEAI>2.0.CO;2
    journal fristpage1672
    journal lastpage1690
    treeJournal of the Atmospheric Sciences:;1993:;Volume( 050 ):;issue: 012
    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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