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    The Effect of Reflecting Surfaces on the Vertical Structure and Variability of Stratospheric Planetary Waves

    Source: Journal of the Atmospheric Sciences:;2001:;Volume( 058 ):;issue: 019::page 2872
    Author:
    Harnik, Nili
    ,
    Lindzen, Richard S.
    DOI: 10.1175/1520-0469(2001)058<2872:TEORSO>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The effects of an upper-stratospheric reflecting surface on the vertical structure of stratospheric planetary waves are considered. A diagnostic of the basic-state wave propagation characteristics, which is particularly useful for determining the existence and location of turning surfaces for meridional and vertical propagation, is developed. The diagnostic used is a more accurate indicator of wave propagation regions than the index of refraction because it diagnoses meridional and vertical propagation separately. The diagnostic is tested on a series of simple models, both steady state and time dependent. It is found that the stratospheric waveguide sets the meridional wavenumber of the waves, regardless of the characteristics of their tropospheric forcing, making it easier to understand the effects of damping and turning surfaces on the vertical structure of the waves. The diagnostic is then applied to observations of the Southern Hemisphere winter of 1996. It is shown that the differences in vertical wave structure between middle and late winter can be explained as a linear response to the seasonal evolution of the basic state, which involves a formation of a reflecting surface in late winter. It is also shown that on daily timescales wave?mean flow interactions cause significant changes in the basic-state propagation characteristics for periods of a few days. These changes, along with the time variations in the forcing of the waves, are responsible for the observed daily timescale variations in wave structure. The fact that the observed evolution of the waves and the basic state are consistent with linear or quasi-linear wave theory (depending on the timescale looked at) supports the applicability of the theory, as well as the validity of the observations.
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      The Effect of Reflecting Surfaces on the Vertical Structure and Variability of Stratospheric Planetary Waves

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4159444
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    contributor authorHarnik, Nili
    contributor authorLindzen, Richard S.
    date accessioned2017-06-09T14:37:09Z
    date available2017-06-09T14:37:09Z
    date copyright2001/10/01
    date issued2001
    identifier issn0022-4928
    identifier otherams-22939.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4159444
    description abstractThe effects of an upper-stratospheric reflecting surface on the vertical structure of stratospheric planetary waves are considered. A diagnostic of the basic-state wave propagation characteristics, which is particularly useful for determining the existence and location of turning surfaces for meridional and vertical propagation, is developed. The diagnostic used is a more accurate indicator of wave propagation regions than the index of refraction because it diagnoses meridional and vertical propagation separately. The diagnostic is tested on a series of simple models, both steady state and time dependent. It is found that the stratospheric waveguide sets the meridional wavenumber of the waves, regardless of the characteristics of their tropospheric forcing, making it easier to understand the effects of damping and turning surfaces on the vertical structure of the waves. The diagnostic is then applied to observations of the Southern Hemisphere winter of 1996. It is shown that the differences in vertical wave structure between middle and late winter can be explained as a linear response to the seasonal evolution of the basic state, which involves a formation of a reflecting surface in late winter. It is also shown that on daily timescales wave?mean flow interactions cause significant changes in the basic-state propagation characteristics for periods of a few days. These changes, along with the time variations in the forcing of the waves, are responsible for the observed daily timescale variations in wave structure. The fact that the observed evolution of the waves and the basic state are consistent with linear or quasi-linear wave theory (depending on the timescale looked at) supports the applicability of the theory, as well as the validity of the observations.
    publisherAmerican Meteorological Society
    titleThe Effect of Reflecting Surfaces on the Vertical Structure and Variability of Stratospheric Planetary Waves
    typeJournal Paper
    journal volume58
    journal issue19
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(2001)058<2872:TEORSO>2.0.CO;2
    journal fristpage2872
    journal lastpage2894
    treeJournal of the Atmospheric Sciences:;2001:;Volume( 058 ):;issue: 019
    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