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    Planetary-Scale Waves in the Southern Hemisphere Winter and Early Spring Stratosphere: Stability Analysis

    Source: Journal of the Atmospheric Sciences:;1991:;Volume( 048 ):;issue: 023::page 2509
    Author:
    Manney, G. L.
    ,
    Elson, L. S.
    ,
    Mechoso, C. R.
    ,
    Farrara, J. D.
    DOI: 10.1175/1520-0469(1991)048<2509:PSWITS>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Eastward-traveling waves 2 and 3 are frequently observed to grow in the Southern Hemisphere stratosphere during late winter and early spring. Observations show times when wave 2 growth appears to be confined to the stratosphere. This suggests that instability is one in situ mechanism that should be considered. The stability of stratospheric flows derived from data is examined during some of these times, using several linear models of quasigeostrophic instability. Unstable modes of both wave 2 and wave 3 have periods and spatial structures similar to observations. Wave 2 and wave 3 momentum fluxes are similar in observations and model results and are consistent with the transfer of kinetic energy from the zonal-mean flow to the wave. When a barotropic model with a zonally symmetric basic flow is used, wave 3 is usually most unstable. Including a stationary wave 1 in the basic flow destabilizes both wave 2 and wave 3, but has little effect on their periods or spatial structures. When a zonally symmetric flow with realistic meridional and vertical structure is used, resulting unstable modes have shorter periods and slower growth rates than for barotropic flows. Wave 2 is usually more unstable than wave 3 when realistic vertical structure is included. The similarity between observed fields and model results in a number of cases when wave 2 appears to grow within the stratosphere suggests that in situ instabilities play a role in the evolution of the eastward-traveling wave 2 characteristic of the Southern Hemisphere winter and early spring stratosphere.
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      Planetary-Scale Waves in the Southern Hemisphere Winter and Early Spring Stratosphere: Stability Analysis

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4156878
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    contributor authorManney, G. L.
    contributor authorElson, L. S.
    contributor authorMechoso, C. R.
    contributor authorFarrara, J. D.
    date accessioned2017-06-09T14:30:38Z
    date available2017-06-09T14:30:38Z
    date copyright1991/12/01
    date issued1991
    identifier issn0022-4928
    identifier otherams-20629.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4156878
    description abstractEastward-traveling waves 2 and 3 are frequently observed to grow in the Southern Hemisphere stratosphere during late winter and early spring. Observations show times when wave 2 growth appears to be confined to the stratosphere. This suggests that instability is one in situ mechanism that should be considered. The stability of stratospheric flows derived from data is examined during some of these times, using several linear models of quasigeostrophic instability. Unstable modes of both wave 2 and wave 3 have periods and spatial structures similar to observations. Wave 2 and wave 3 momentum fluxes are similar in observations and model results and are consistent with the transfer of kinetic energy from the zonal-mean flow to the wave. When a barotropic model with a zonally symmetric basic flow is used, wave 3 is usually most unstable. Including a stationary wave 1 in the basic flow destabilizes both wave 2 and wave 3, but has little effect on their periods or spatial structures. When a zonally symmetric flow with realistic meridional and vertical structure is used, resulting unstable modes have shorter periods and slower growth rates than for barotropic flows. Wave 2 is usually more unstable than wave 3 when realistic vertical structure is included. The similarity between observed fields and model results in a number of cases when wave 2 appears to grow within the stratosphere suggests that in situ instabilities play a role in the evolution of the eastward-traveling wave 2 characteristic of the Southern Hemisphere winter and early spring stratosphere.
    publisherAmerican Meteorological Society
    titlePlanetary-Scale Waves in the Southern Hemisphere Winter and Early Spring Stratosphere: Stability Analysis
    typeJournal Paper
    journal volume48
    journal issue23
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1991)048<2509:PSWITS>2.0.CO;2
    journal fristpage2509
    journal lastpage2523
    treeJournal of the Atmospheric Sciences:;1991:;Volume( 048 ):;issue: 023
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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