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    Dynamical Decomposition of Low-Frequency Tendencies

    Source: Journal of the Atmospheric Sciences:;1994:;Volume( 051 ):;issue: 014::page 2086
    Author:
    Cai, Ming
    ,
    Van Den Dool, Huug M.
    DOI: 10.1175/1520-0469(1994)051<2086:DDOLFT>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: A nearly complete vorticity equation is used to diagnose the tendency components of the low-frequency variations of the 500-mb streamfunction induced by various internal linear-nonlinear interaction processes. With the aid of a special composite technique (?phase-shifting? method) that effectively records the observations in a coordinate system moving with an identifiable low-frequency pattern, the authors are able to separate the internal interactions that primarily act to make low-frequency waves propagate from those that are mostly responsible for development/maintenance/decay (?maintenance? for brevity) of low-frequency transients. It is found that the low-frequency transients are maintained primarily by two nonlinear interaction processes: one is the vorticity flux of high-frequency eddies and the other is the interaction of low-frequency transients and stationary waves. It is also found that an individual propagation tendency component may be much larger than a maintenance tendency component. In particular, the beta effect and the advection of the low-frequency vorticity by the zonally averaged climatological wind are the dominant terms among the propagation tendency components. But there is a great deal of cancellation among the propagation tendency components. As a result, the net magnitude of the tendency components describing propagation is only slightly larger than those relating to maintenance of low-frequency waves. From a forecast point of view, both propagation and forcing terms are equally important if an accurate forecast beyond a few days is required.
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      Dynamical Decomposition of Low-Frequency Tendencies

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    contributor authorCai, Ming
    contributor authorVan Den Dool, Huug M.
    date accessioned2017-06-09T14:32:22Z
    date available2017-06-09T14:32:22Z
    date copyright1994/07/01
    date issued1994
    identifier issn0022-4928
    identifier otherams-21232.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4157549
    description abstractA nearly complete vorticity equation is used to diagnose the tendency components of the low-frequency variations of the 500-mb streamfunction induced by various internal linear-nonlinear interaction processes. With the aid of a special composite technique (?phase-shifting? method) that effectively records the observations in a coordinate system moving with an identifiable low-frequency pattern, the authors are able to separate the internal interactions that primarily act to make low-frequency waves propagate from those that are mostly responsible for development/maintenance/decay (?maintenance? for brevity) of low-frequency transients. It is found that the low-frequency transients are maintained primarily by two nonlinear interaction processes: one is the vorticity flux of high-frequency eddies and the other is the interaction of low-frequency transients and stationary waves. It is also found that an individual propagation tendency component may be much larger than a maintenance tendency component. In particular, the beta effect and the advection of the low-frequency vorticity by the zonally averaged climatological wind are the dominant terms among the propagation tendency components. But there is a great deal of cancellation among the propagation tendency components. As a result, the net magnitude of the tendency components describing propagation is only slightly larger than those relating to maintenance of low-frequency waves. From a forecast point of view, both propagation and forcing terms are equally important if an accurate forecast beyond a few days is required.
    publisherAmerican Meteorological Society
    titleDynamical Decomposition of Low-Frequency Tendencies
    typeJournal Paper
    journal volume51
    journal issue14
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1994)051<2086:DDOLFT>2.0.CO;2
    journal fristpage2086
    journal lastpage2100
    treeJournal of the Atmospheric Sciences:;1994:;Volume( 051 ):;issue: 014
    contenttypeFulltext
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