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    Some Dynamical Constraints on Upstream Pathways of the Denmark Strait Overflow

    Source: Journal of Physical Oceanography:;2014:;Volume( 044 ):;issue: 012::page 3033
    Author:
    Yang, Jiayan
    ,
    Pratt, Lawrence J.
    DOI: 10.1175/JPO-D-13-0227.1
    Publisher: American Meteorological Society
    Abstract: he East Greenland Current (EGC) had long been considered the main pathway for the Denmark Strait overflow (DSO). Recent observations, however, indicate that the north Icelandic jet (NIJ), which flows westward along the north coast of Iceland, is a major separate pathway for the DSO. In this study a two-layer numerical model and complementary integral constraints are used to examine various pathways that lead to the DSO and to explore plausible mechanisms for the NIJ?s existence. In these simulations, a westward and NIJ-like current emerges as a robust feature and a main pathway for the Denmark Strait overflow. Its existence can be explained through circulation integrals around advantageous contours. One such constraint spells out the consequences of overflow water as a source of low potential vorticity. A stronger constraint can be added when the outflow occurs through two outlets: it takes the form of a circulation integral around the Iceland?Faroe Ridge. In either case, the direction of overall circulation about the contour can be deduced from the required frictional torques. Some effects of wind stress forcing are also examined. The overall positive curl of the wind forces cyclonic gyres in both layers, enhancing the East Greenland Current. The wind stress forcing weakens but does not eliminate the NIJ. It also modifies the sign of the deep circulation in various subbasins and alters the path by which overflow water is brought to the Faroe Bank Channel, all in ways that bring the idealized model more in line with observations. The sequence of numerical experiments separates the effects of wind and buoyancy forcing and shows how each is important.
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      Some Dynamical Constraints on Upstream Pathways of the Denmark Strait Overflow

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4226657
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    contributor authorYang, Jiayan
    contributor authorPratt, Lawrence J.
    date accessioned2017-06-09T17:20:17Z
    date available2017-06-09T17:20:17Z
    date copyright2014/12/01
    date issued2014
    identifier issn0022-3670
    identifier otherams-83432.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4226657
    description abstracthe East Greenland Current (EGC) had long been considered the main pathway for the Denmark Strait overflow (DSO). Recent observations, however, indicate that the north Icelandic jet (NIJ), which flows westward along the north coast of Iceland, is a major separate pathway for the DSO. In this study a two-layer numerical model and complementary integral constraints are used to examine various pathways that lead to the DSO and to explore plausible mechanisms for the NIJ?s existence. In these simulations, a westward and NIJ-like current emerges as a robust feature and a main pathway for the Denmark Strait overflow. Its existence can be explained through circulation integrals around advantageous contours. One such constraint spells out the consequences of overflow water as a source of low potential vorticity. A stronger constraint can be added when the outflow occurs through two outlets: it takes the form of a circulation integral around the Iceland?Faroe Ridge. In either case, the direction of overall circulation about the contour can be deduced from the required frictional torques. Some effects of wind stress forcing are also examined. The overall positive curl of the wind forces cyclonic gyres in both layers, enhancing the East Greenland Current. The wind stress forcing weakens but does not eliminate the NIJ. It also modifies the sign of the deep circulation in various subbasins and alters the path by which overflow water is brought to the Faroe Bank Channel, all in ways that bring the idealized model more in line with observations. The sequence of numerical experiments separates the effects of wind and buoyancy forcing and shows how each is important.
    publisherAmerican Meteorological Society
    titleSome Dynamical Constraints on Upstream Pathways of the Denmark Strait Overflow
    typeJournal Paper
    journal volume44
    journal issue12
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO-D-13-0227.1
    journal fristpage3033
    journal lastpage3053
    treeJournal of Physical Oceanography:;2014:;Volume( 044 ):;issue: 012
    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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