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    The M2 Internal Tide off Oregon: Inferences from Data Assimilation

    Source: Journal of Physical Oceanography:;2003:;Volume( 033 ):;issue: 008::page 1733
    Author:
    Kurapov, Alexander L.
    ,
    Egbert, Gary D.
    ,
    Allen, J. S.
    ,
    Miller, Robert N.
    ,
    Erofeeva, Svetlana Y.
    ,
    Kosro, P. M.
    DOI: 10.1175/1520-0485(2003)033<1733:TMITOO>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: A linearized baroclinic, spectral-in-time tidal inverse model has been developed for assimilation of surface currents from coast-based high-frequency (HF) radars. Representer functions obtained as a part of the generalized inverse solution show that for superinertial flows information from the surface velocity measurements propagates to depth along wave characteristics, allowing internal tidal flows to be mapped throughout the water column. Application of the inverse model to a 38 km ? 57 km domain off the mid-Oregon coast, where data from two HF radar systems are available, provides a uniquely detailed picture of spatial and temporal variability of the M2 internal tide in a coastal environment. Most baroclinic signal contained in the data comes from outside the computational domain, and so data assimilation (DA) is used to restore baroclinic currents at the open boundary (OB). Experiments with synthetic data demonstrate that the choice of the error covariance for the OB condition affects model performance. A covariance consistent with assumed dynamics is obtained by nesting, using representers computed in a larger domain. Harmonic analysis of currents from HF radars and an acoustic Doppler profiler (ADP) mooring off Oregon for May?July 1998 reveals substantial intermittence of the internal tide, both in amplitude and phase. Assimilation of the surface current measurements captures the temporal variability and improves the ADP/solution rms difference. Despite significant temporal variability, persistent features are found for the studied period; for instance, the dominant direction of baroclinic wave phase and energy propagation is always from the northwest. At the surface, baroclinic surface tidal currents (deviations from the depth-averaged current) can be 10 cm s?1, 2 times as large as the depth-averaged current. Barotropic-to-baroclinic energy conversion is generally weak within the model domain over the shelf but reaches 5 mW m?2 at times over the slopes of Stonewall Bank.
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      The M2 Internal Tide off Oregon: Inferences from Data Assimilation

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4167186
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    • Journal of Physical Oceanography

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    contributor authorKurapov, Alexander L.
    contributor authorEgbert, Gary D.
    contributor authorAllen, J. S.
    contributor authorMiller, Robert N.
    contributor authorErofeeva, Svetlana Y.
    contributor authorKosro, P. M.
    date accessioned2017-06-09T14:55:54Z
    date available2017-06-09T14:55:54Z
    date copyright2003/08/01
    date issued2003
    identifier issn0022-3670
    identifier otherams-29907.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4167186
    description abstractA linearized baroclinic, spectral-in-time tidal inverse model has been developed for assimilation of surface currents from coast-based high-frequency (HF) radars. Representer functions obtained as a part of the generalized inverse solution show that for superinertial flows information from the surface velocity measurements propagates to depth along wave characteristics, allowing internal tidal flows to be mapped throughout the water column. Application of the inverse model to a 38 km ? 57 km domain off the mid-Oregon coast, where data from two HF radar systems are available, provides a uniquely detailed picture of spatial and temporal variability of the M2 internal tide in a coastal environment. Most baroclinic signal contained in the data comes from outside the computational domain, and so data assimilation (DA) is used to restore baroclinic currents at the open boundary (OB). Experiments with synthetic data demonstrate that the choice of the error covariance for the OB condition affects model performance. A covariance consistent with assumed dynamics is obtained by nesting, using representers computed in a larger domain. Harmonic analysis of currents from HF radars and an acoustic Doppler profiler (ADP) mooring off Oregon for May?July 1998 reveals substantial intermittence of the internal tide, both in amplitude and phase. Assimilation of the surface current measurements captures the temporal variability and improves the ADP/solution rms difference. Despite significant temporal variability, persistent features are found for the studied period; for instance, the dominant direction of baroclinic wave phase and energy propagation is always from the northwest. At the surface, baroclinic surface tidal currents (deviations from the depth-averaged current) can be 10 cm s?1, 2 times as large as the depth-averaged current. Barotropic-to-baroclinic energy conversion is generally weak within the model domain over the shelf but reaches 5 mW m?2 at times over the slopes of Stonewall Bank.
    publisherAmerican Meteorological Society
    titleThe M2 Internal Tide off Oregon: Inferences from Data Assimilation
    typeJournal Paper
    journal volume33
    journal issue8
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(2003)033<1733:TMITOO>2.0.CO;2
    journal fristpage1733
    journal lastpage1757
    treeJournal of Physical Oceanography:;2003:;Volume( 033 ):;issue: 008
    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