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    The Effect of Lower Stratospheric Shear on Baroclinic Instability

    Source: Journal of the Atmospheric Sciences:;2007:;Volume( 064 ):;issue: 002::page 479
    Author:
    Wittman, Matthew A. H.
    ,
    Charlton, Andrew J.
    ,
    Polvani, Lorenzo M.
    DOI: 10.1175/JAS3828.1
    Publisher: American Meteorological Society
    Abstract: Using a hierarchy of models, and observations, the effect of vertical shear in the lower stratosphere on baroclinic instability in the tropospheric midlatitude jet is examined. It is found that increasing stratospheric shear increases the phase speed of growing baroclinic waves, increases the growth rate of modes with low synoptic wavenumbers, and decreases the growth rate of modes with higher wavenumbers. The meridional structure of the linear modes, and their acceleration of the zonal mean jet, changes with increasing stratospheric shear, but in a way that apparently contradicts the observed stratosphere?troposphere northern annular mode (NAM) connection. This contradiction is resolved at finite amplitude. In nonlinear life cycle experiments it is found that increasing stratospheric shear, without changing the jet structure in the troposphere, produces a transition from anticyclonic (LC1) to cyclonic (LC2) behavior at wavenumber 7. All life cycles with wavenumbers lower than 7 are LC1, and all with wavenumber greater than 7 are LC2. For the LC1 life cycles, the effect of increasing stratospheric shear is to increase the poleward displacement of the zonal mean jet by the eddies, which is consistent with the observed stratosphere?troposphere NAM connection. Finally, it is found that the connection between high stratospheric shear and high-tropospheric NAM is present by NCEP?NCAR reanalysis data.
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      The Effect of Lower Stratospheric Shear on Baroclinic Instability

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4218413
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    contributor authorWittman, Matthew A. H.
    contributor authorCharlton, Andrew J.
    contributor authorPolvani, Lorenzo M.
    date accessioned2017-06-09T16:53:21Z
    date available2017-06-09T16:53:21Z
    date copyright2007/02/01
    date issued2007
    identifier issn0022-4928
    identifier otherams-76012.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4218413
    description abstractUsing a hierarchy of models, and observations, the effect of vertical shear in the lower stratosphere on baroclinic instability in the tropospheric midlatitude jet is examined. It is found that increasing stratospheric shear increases the phase speed of growing baroclinic waves, increases the growth rate of modes with low synoptic wavenumbers, and decreases the growth rate of modes with higher wavenumbers. The meridional structure of the linear modes, and their acceleration of the zonal mean jet, changes with increasing stratospheric shear, but in a way that apparently contradicts the observed stratosphere?troposphere northern annular mode (NAM) connection. This contradiction is resolved at finite amplitude. In nonlinear life cycle experiments it is found that increasing stratospheric shear, without changing the jet structure in the troposphere, produces a transition from anticyclonic (LC1) to cyclonic (LC2) behavior at wavenumber 7. All life cycles with wavenumbers lower than 7 are LC1, and all with wavenumber greater than 7 are LC2. For the LC1 life cycles, the effect of increasing stratospheric shear is to increase the poleward displacement of the zonal mean jet by the eddies, which is consistent with the observed stratosphere?troposphere NAM connection. Finally, it is found that the connection between high stratospheric shear and high-tropospheric NAM is present by NCEP?NCAR reanalysis data.
    publisherAmerican Meteorological Society
    titleThe Effect of Lower Stratospheric Shear on Baroclinic Instability
    typeJournal Paper
    journal volume64
    journal issue2
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS3828.1
    journal fristpage479
    journal lastpage496
    treeJournal of the Atmospheric Sciences:;2007:;Volume( 064 ):;issue: 002
    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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