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    The Unpredictable Nature of Internal Tides on Continental Shelves

    Source: Journal of Physical Oceanography:;2012:;Volume( 042 ):;issue: 011::page 1981
    Author:
    Nash, Jonathan D.
    ,
    Kelly, Samuel M.
    ,
    Shroyer, Emily L.
    ,
    Moum, James N.
    ,
    Duda, Timothy F.
    DOI: 10.1175/JPO-D-12-028.1
    Publisher: American Meteorological Society
    Abstract: ackets of nonlinear internal waves (NLIWs) in a small area of the Mid-Atlantic Bight were 10 times more energetic during a local neap tide than during the preceding spring tide. This counterintuitive result cannot be explained if the waves are generated near the shelf break by the local barotropic tide since changes in shelfbreak stratification explain only a small fraction of the variability in barotropic to baroclinic conversion. Instead, this study suggests that the occurrence of strong NLIWs was caused by the shoaling of distantly generated internal tides with amplitudes that are uncorrelated with the local spring-neap cycle. An extensive set of moored observations show that NLIWs are correlated with the internal tide but uncorrelated with barotropic tide. Using harmonic analysis of a 40-day record, this study associates steady-phase motions at the shelf break with waves generated by the local barotropic tide and variable-phase motions with the shoaling of distantly generated internal tides. The dual sources of internal tide energy (local or remote) mean that shelf internal tides and NLIWs will be predictable with a local model only if the locally generated internal tides are significantly stronger than shoaling internal tides. Since the depth-integrated internal tide energy in the open ocean can greatly exceed that on the shelf, it is likely that shoaling internal tides control the energetics on shelves that are directly exposed to the open ocean.
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      The Unpredictable Nature of Internal Tides on Continental Shelves

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    contributor authorNash, Jonathan D.
    contributor authorKelly, Samuel M.
    contributor authorShroyer, Emily L.
    contributor authorMoum, James N.
    contributor authorDuda, Timothy F.
    date accessioned2017-06-09T17:19:49Z
    date available2017-06-09T17:19:49Z
    date copyright2012/11/01
    date issued2012
    identifier issn0022-3670
    identifier otherams-83294.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4226503
    description abstractackets of nonlinear internal waves (NLIWs) in a small area of the Mid-Atlantic Bight were 10 times more energetic during a local neap tide than during the preceding spring tide. This counterintuitive result cannot be explained if the waves are generated near the shelf break by the local barotropic tide since changes in shelfbreak stratification explain only a small fraction of the variability in barotropic to baroclinic conversion. Instead, this study suggests that the occurrence of strong NLIWs was caused by the shoaling of distantly generated internal tides with amplitudes that are uncorrelated with the local spring-neap cycle. An extensive set of moored observations show that NLIWs are correlated with the internal tide but uncorrelated with barotropic tide. Using harmonic analysis of a 40-day record, this study associates steady-phase motions at the shelf break with waves generated by the local barotropic tide and variable-phase motions with the shoaling of distantly generated internal tides. The dual sources of internal tide energy (local or remote) mean that shelf internal tides and NLIWs will be predictable with a local model only if the locally generated internal tides are significantly stronger than shoaling internal tides. Since the depth-integrated internal tide energy in the open ocean can greatly exceed that on the shelf, it is likely that shoaling internal tides control the energetics on shelves that are directly exposed to the open ocean.
    publisherAmerican Meteorological Society
    titleThe Unpredictable Nature of Internal Tides on Continental Shelves
    typeJournal Paper
    journal volume42
    journal issue11
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO-D-12-028.1
    journal fristpage1981
    journal lastpage2000
    treeJournal of Physical Oceanography:;2012:;Volume( 042 ):;issue: 011
    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