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    Intraseasonal Variability in a Dry Atmospheric Model

    Source: Journal of the Atmospheric Sciences:;2007:;Volume( 064 ):;issue: 007::page 2422
    Author:
    Lin, Hai
    ,
    Brunet, Gilbert
    ,
    Derome, Jacques
    DOI: 10.1175/JAS3955.1
    Publisher: American Meteorological Society
    Abstract: A long integration of a primitive equation dry atmospheric model with time-independent forcing under boreal winter conditions is analyzed. A variety of techniques such as time filtering, space?time spectral analysis, and lag regressions are used to identify tropical waves. It is evident that oscillations with intraseasonal time scales and a Kelvin wave structure exist in the model tropical atmosphere. Coherent eastward propagations in the 250-hPa velocity potential and zonal wind are found, with a speed of about 15 m s?1. The oscillation is stronger in the Eastern Hemisphere than in the Western Hemisphere. Interactions between the tropical and extratropical flows are found to be responsible for the simulated intraseasonal variability. Wave activity flux analysis reveals that a tropical influence occurs in the North Pacific region where a northeastward wave activity flux is found associated with the tropical divergent flow in the western and central Pacific. In the North Atlantic sector, on the other hand, a strong extratropical influence is observed with a southward wave activity flux into the Tropics. The extratropical low-frequency variability develops by extracting kinetic energy from the basic mean flow and through interactions with synoptic-scale transient eddies. Linear experiments show that the tropical atmospheric response to the extratropical forcing in the North Atlantic leads to an eastward-propagating wave in the tropical easterly mean flow of the Eastern Hemisphere.
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      Intraseasonal Variability in a Dry Atmospheric Model

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    contributor authorLin, Hai
    contributor authorBrunet, Gilbert
    contributor authorDerome, Jacques
    date accessioned2017-06-09T16:53:47Z
    date available2017-06-09T16:53:47Z
    date copyright2007/07/01
    date issued2007
    identifier issn0022-4928
    identifier otherams-76138.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4218552
    description abstractA long integration of a primitive equation dry atmospheric model with time-independent forcing under boreal winter conditions is analyzed. A variety of techniques such as time filtering, space?time spectral analysis, and lag regressions are used to identify tropical waves. It is evident that oscillations with intraseasonal time scales and a Kelvin wave structure exist in the model tropical atmosphere. Coherent eastward propagations in the 250-hPa velocity potential and zonal wind are found, with a speed of about 15 m s?1. The oscillation is stronger in the Eastern Hemisphere than in the Western Hemisphere. Interactions between the tropical and extratropical flows are found to be responsible for the simulated intraseasonal variability. Wave activity flux analysis reveals that a tropical influence occurs in the North Pacific region where a northeastward wave activity flux is found associated with the tropical divergent flow in the western and central Pacific. In the North Atlantic sector, on the other hand, a strong extratropical influence is observed with a southward wave activity flux into the Tropics. The extratropical low-frequency variability develops by extracting kinetic energy from the basic mean flow and through interactions with synoptic-scale transient eddies. Linear experiments show that the tropical atmospheric response to the extratropical forcing in the North Atlantic leads to an eastward-propagating wave in the tropical easterly mean flow of the Eastern Hemisphere.
    publisherAmerican Meteorological Society
    titleIntraseasonal Variability in a Dry Atmospheric Model
    typeJournal Paper
    journal volume64
    journal issue7
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS3955.1
    journal fristpage2422
    journal lastpage2441
    treeJournal of the Atmospheric Sciences:;2007:;Volume( 064 ):;issue: 007
    contenttypeFulltext
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