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    Dynamical Forcing of Subseasonal Variability in the Tropical Brewer–Dobson Circulation

    Source: Journal of the Atmospheric Sciences:;2014:;Volume( 071 ):;issue: 009::page 3439
    Author:
    Abalos, Marta
    ,
    Randel, William J.
    ,
    Serrano, Encarna
    DOI: 10.1175/JAS-D-13-0366.1
    Publisher: American Meteorological Society
    Abstract: pwelling across the tropical tropopause exhibits strong subseasonal variability superimposed on the well-known annual cycle, and these variations directly affect temperature and tracers in the tropical lower stratosphere. In this work, the dynamical forcing of tropical upwelling on subseasonal time scales is investigated using the European Centre for Medium-Range Weather Forecasts (ECMWF) Interim Re-Analysis (ERA-Interim) for 1979?2011. Momentum balance diagnostics reveal that transience in lower-stratospheric upwelling is linked to the effects of extratropical wave forcing, with centers of action in the extratropical winter stratosphere and in the subtropical upper troposphere of both hemispheres. The time-dependent forcing in these regions induces a remote coupled response in the zonal mean wind and the meridional circulation (with associated temperature changes), which drives upwelling variability in the tropical stratosphere. This behavior is observed in the reanalysis, consistent with theory. Dynamical patterns reflect distinctive forcing of the shallow versus deep branches of the Brewer?Dobson circulation; the shallow branch is most strongly correlated with wave forcing in the subtropical upper troposphere and lower stratosphere, while the deep branch is mainly influenced by high-latitude planetary waves.
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      Dynamical Forcing of Subseasonal Variability in the Tropical Brewer–Dobson Circulation

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4219437
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    contributor authorAbalos, Marta
    contributor authorRandel, William J.
    contributor authorSerrano, Encarna
    date accessioned2017-06-09T16:57:02Z
    date available2017-06-09T16:57:02Z
    date copyright2014/09/01
    date issued2014
    identifier issn0022-4928
    identifier otherams-76935.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4219437
    description abstractpwelling across the tropical tropopause exhibits strong subseasonal variability superimposed on the well-known annual cycle, and these variations directly affect temperature and tracers in the tropical lower stratosphere. In this work, the dynamical forcing of tropical upwelling on subseasonal time scales is investigated using the European Centre for Medium-Range Weather Forecasts (ECMWF) Interim Re-Analysis (ERA-Interim) for 1979?2011. Momentum balance diagnostics reveal that transience in lower-stratospheric upwelling is linked to the effects of extratropical wave forcing, with centers of action in the extratropical winter stratosphere and in the subtropical upper troposphere of both hemispheres. The time-dependent forcing in these regions induces a remote coupled response in the zonal mean wind and the meridional circulation (with associated temperature changes), which drives upwelling variability in the tropical stratosphere. This behavior is observed in the reanalysis, consistent with theory. Dynamical patterns reflect distinctive forcing of the shallow versus deep branches of the Brewer?Dobson circulation; the shallow branch is most strongly correlated with wave forcing in the subtropical upper troposphere and lower stratosphere, while the deep branch is mainly influenced by high-latitude planetary waves.
    publisherAmerican Meteorological Society
    titleDynamical Forcing of Subseasonal Variability in the Tropical Brewer–Dobson Circulation
    typeJournal Paper
    journal volume71
    journal issue9
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-13-0366.1
    journal fristpage3439
    journal lastpage3453
    treeJournal of the Atmospheric Sciences:;2014:;Volume( 071 ):;issue: 009
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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