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    Multiscale Dynamical Processes Underlying the Wintertime Atlantic Blockings

    Source: Journal of the Atmospheric Sciences:;2017:;Volume( 074 ):;issue: 011::page 3815
    Author:
    Ma, Jiwang;San Liang, X.
    DOI: 10.1175/JAS-D-16-0295.1
    Publisher: American Meteorological Society
    Abstract: AbstractThe wintertime atmospheric blocking over the Atlantic is investigated using a newly developed methodology?namely, localized multiscale energy and vorticity analysis (MS-EVA)?and the theory of canonical energy transfer. Through a multiscale window transform (MWT), the atmospheric fields from the ERA-40 data are reconstructed on three-scale ranges or scale windows: basic-flow window, blocking window, and synoptic window. The blocking event is obtained by compositing the wintertime blocking episodes, and a clear westward-retrograding signal is identified on the blocking window. Likewise, the local multiscale energetics following the signal are composited. It is found that a life cycle of the blocking-scale kinetic energy (KE) may be divided into three phases: onset phase, amplification phase, and decay phase. Different phases have different mechanisms in play. In general, pressure work and the canonical transfer from the synoptic eddies initiate the generation of the blocking, while the latter contributes to its amplification. The blocking decays as the system transports the KE away and as it converts the KE into available potential energy (APE) through buoyancy conversion. For the APE on the blocking window, its evolution experiences two maxima and, correspondingly, two phases can be distinguished. In the first maximum phase, the dominating mechanism is baroclinic instability; in the second, buoyancy conversion takes place. These are also the mechanisms that cause the warm core of the blocking in the troposphere.
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      Multiscale Dynamical Processes Underlying the Wintertime Atlantic Blockings

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    contributor authorMa, Jiwang;San Liang, X.
    date accessioned2018-01-03T11:02:31Z
    date available2018-01-03T11:02:31Z
    date copyright7/26/2017 12:00:00 AM
    date issued2017
    identifier otherjas-d-16-0295.1.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4246456
    description abstractAbstractThe wintertime atmospheric blocking over the Atlantic is investigated using a newly developed methodology?namely, localized multiscale energy and vorticity analysis (MS-EVA)?and the theory of canonical energy transfer. Through a multiscale window transform (MWT), the atmospheric fields from the ERA-40 data are reconstructed on three-scale ranges or scale windows: basic-flow window, blocking window, and synoptic window. The blocking event is obtained by compositing the wintertime blocking episodes, and a clear westward-retrograding signal is identified on the blocking window. Likewise, the local multiscale energetics following the signal are composited. It is found that a life cycle of the blocking-scale kinetic energy (KE) may be divided into three phases: onset phase, amplification phase, and decay phase. Different phases have different mechanisms in play. In general, pressure work and the canonical transfer from the synoptic eddies initiate the generation of the blocking, while the latter contributes to its amplification. The blocking decays as the system transports the KE away and as it converts the KE into available potential energy (APE) through buoyancy conversion. For the APE on the blocking window, its evolution experiences two maxima and, correspondingly, two phases can be distinguished. In the first maximum phase, the dominating mechanism is baroclinic instability; in the second, buoyancy conversion takes place. These are also the mechanisms that cause the warm core of the blocking in the troposphere.
    publisherAmerican Meteorological Society
    titleMultiscale Dynamical Processes Underlying the Wintertime Atlantic Blockings
    typeJournal Paper
    journal volume74
    journal issue11
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-16-0295.1
    journal fristpage3815
    journal lastpage3831
    treeJournal of the Atmospheric Sciences:;2017:;Volume( 074 ):;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
    yabeshDSpacePersian