YaBeSH Engineering and Technology Library

    • Journals
    • PaperQuest
    • YSE Standards
    • YaBeSH
    • Login
    View Item 
    •   YE&T Library
    • AMS
    • Journal of Physical Oceanography
    • View Item
    •   YE&T Library
    • AMS
    • Journal of Physical Oceanography
    • View Item
    • All Fields
    • Source Title
    • Year
    • Publisher
    • Title
    • Subject
    • Author
    • DOI
    • ISBN
    Advanced Search
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Archive

    Instabilities in an Internal Solitary-like Wave on the Oregon Shelf

    Source: Journal of Physical Oceanography:;2010:;Volume( 041 ):;issue: 001::page 67
    Author:
    Lamb, Kevin G.
    ,
    Farmer, David
    DOI: 10.1175/2010JPO4308.1
    Publisher: American Meteorological Society
    Abstract: Observations of internal solitary-like waves (ISWs) on the Oregon Shelf suggest the presence of Kelvin?Helmholtz billows in the pycnocline and larger-scale overturns at the back of the wave above the pycnocline. Numerical simulations designed to explore the mechanisms responsible for these features in one particular wave reveal that shear instabilities occur when (i) the minimum Richardson number Ri in the pycnocline is less than about 0.1; (ii) Lx/? > 0.8, where Lx is the length of the unstable region with Ri < 0.25 and ? is a half wavelength of the wave; and (iii) a linear spatial stability analysis predicts that ln(af/ai) >≈ 4, where ai and af are the amplitudes of perturbations entering and leaving the unstable region. The maximum energy loss rate in our simulations is 50 W m?1, occurring at a frequency 8% below that with the maximum spatial growth rate. The observations revealed the presence of anomalously light fluid in the center of the wave above the pycnocline. Simulations of a wave encountering a patch of light surface water were used to model this effect. In the presence of a background current with near-surface shear, the simulated ISW has a trapped surface core. As this wave encounters a patch of lighter surface water, the light surface water at first passes beneath the core. Convective instabilities set in and the light fluid is entrained into the core. This results in the formation of overturning features, which exhibit some similarities with the observed overturns.
    • Download: (7.764Mb)
    • Show Full MetaData Hide Full MetaData
    • Item Order
    • Go To Publisher
    • Price: 5000 Rial
    • Statistics

      Instabilities in an Internal Solitary-like Wave on the Oregon Shelf

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4212744
    Collections
    • Journal of Physical Oceanography

    Show full item record

    contributor authorLamb, Kevin G.
    contributor authorFarmer, David
    date accessioned2017-06-09T16:36:42Z
    date available2017-06-09T16:36:42Z
    date copyright2011/01/01
    date issued2010
    identifier issn0022-3670
    identifier otherams-70911.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4212744
    description abstractObservations of internal solitary-like waves (ISWs) on the Oregon Shelf suggest the presence of Kelvin?Helmholtz billows in the pycnocline and larger-scale overturns at the back of the wave above the pycnocline. Numerical simulations designed to explore the mechanisms responsible for these features in one particular wave reveal that shear instabilities occur when (i) the minimum Richardson number Ri in the pycnocline is less than about 0.1; (ii) Lx/? > 0.8, where Lx is the length of the unstable region with Ri < 0.25 and ? is a half wavelength of the wave; and (iii) a linear spatial stability analysis predicts that ln(af/ai) >≈ 4, where ai and af are the amplitudes of perturbations entering and leaving the unstable region. The maximum energy loss rate in our simulations is 50 W m?1, occurring at a frequency 8% below that with the maximum spatial growth rate. The observations revealed the presence of anomalously light fluid in the center of the wave above the pycnocline. Simulations of a wave encountering a patch of light surface water were used to model this effect. In the presence of a background current with near-surface shear, the simulated ISW has a trapped surface core. As this wave encounters a patch of lighter surface water, the light surface water at first passes beneath the core. Convective instabilities set in and the light fluid is entrained into the core. This results in the formation of overturning features, which exhibit some similarities with the observed overturns.
    publisherAmerican Meteorological Society
    titleInstabilities in an Internal Solitary-like Wave on the Oregon Shelf
    typeJournal Paper
    journal volume41
    journal issue1
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/2010JPO4308.1
    journal fristpage67
    journal lastpage87
    treeJournal of Physical Oceanography:;2010:;Volume( 041 ):;issue: 001
    contenttypeFulltext
    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian
     
    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian