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    Flow and Mixing around a Small Seamount on Kaena Ridge, Hawaii

    Source: Journal of Physical Oceanography:;2006:;Volume( 036 ):;issue: 006::page 1036
    Author:
    Carter, Glenn S.
    ,
    Gregg, Michael C.
    ,
    Merrifield, Mark A.
    DOI: 10.1175/JPO2924.1
    Publisher: American Meteorological Society
    Abstract: Microstructure observations over a small seamount on the Kaena Ridge, Hawaii, showed asymmetry in the along- and across-ridge directions. The ?400-m-high seamount is on the southern edge of the ridge (centered at 21°43?49?N, 158°38?48?W), 42 km northwest of Oahu. A 1-km-resolution numerical simulation shows that the flow within the depth range of the seamount tends to be accelerated around the seamount rather than going up and over it. The flow patterns, however, are more complicated than for an isolated seamount because of the influence of the ?3000-m-high Kaena Ridge. Comparison with the numerical simulations indicates that the across-ridge asymmetry, in which dissipation on the north-northeastern side of the seamount was higher and more concentrated toward the bed than on the south-southwestern side, is consistent with an M2 tidal beam generated at the northern edge of the ridge. The along-ridge asymmetry, with higher dissipation on the east-southeastern flank than on the west-northwestern flank, is in qualitative agreement with M2 shear variance from the model simulation. The average observed dissipation rate over the seamount was ε = 6.2 ? 10?8 W kg?1, and diapycnal diffusivity was K? = 1.3 ? 10?3 m2 s?1. Dissipation measurements following the 1000-m isobath south-southwest of the seamount suggest along-ridge internal tide generation caused by topographic steering that creates an along-ridge current over critical topography northwest of the seamount.
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      Flow and Mixing around a Small Seamount on Kaena Ridge, Hawaii

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    contributor authorCarter, Glenn S.
    contributor authorGregg, Michael C.
    contributor authorMerrifield, Mark A.
    date accessioned2017-06-09T17:18:16Z
    date available2017-06-09T17:18:16Z
    date copyright2006/06/01
    date issued2006
    identifier issn0022-3670
    identifier otherams-82802.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4225957
    description abstractMicrostructure observations over a small seamount on the Kaena Ridge, Hawaii, showed asymmetry in the along- and across-ridge directions. The ?400-m-high seamount is on the southern edge of the ridge (centered at 21°43?49?N, 158°38?48?W), 42 km northwest of Oahu. A 1-km-resolution numerical simulation shows that the flow within the depth range of the seamount tends to be accelerated around the seamount rather than going up and over it. The flow patterns, however, are more complicated than for an isolated seamount because of the influence of the ?3000-m-high Kaena Ridge. Comparison with the numerical simulations indicates that the across-ridge asymmetry, in which dissipation on the north-northeastern side of the seamount was higher and more concentrated toward the bed than on the south-southwestern side, is consistent with an M2 tidal beam generated at the northern edge of the ridge. The along-ridge asymmetry, with higher dissipation on the east-southeastern flank than on the west-northwestern flank, is in qualitative agreement with M2 shear variance from the model simulation. The average observed dissipation rate over the seamount was ε = 6.2 ? 10?8 W kg?1, and diapycnal diffusivity was K? = 1.3 ? 10?3 m2 s?1. Dissipation measurements following the 1000-m isobath south-southwest of the seamount suggest along-ridge internal tide generation caused by topographic steering that creates an along-ridge current over critical topography northwest of the seamount.
    publisherAmerican Meteorological Society
    titleFlow and Mixing around a Small Seamount on Kaena Ridge, Hawaii
    typeJournal Paper
    journal volume36
    journal issue6
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO2924.1
    journal fristpage1036
    journal lastpage1052
    treeJournal of Physical Oceanography:;2006:;Volume( 036 ):;issue: 006
    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
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