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    An Idealized Model of Weddell Gyre Export Variability

    Source: Journal of Physical Oceanography:;2014:;Volume( 044 ):;issue: 006::page 1671
    Author:
    Su, Zhan
    ,
    Stewart, Andrew L.
    ,
    Thompson, Andrew F.
    DOI: 10.1175/JPO-D-13-0263.1
    Publisher: American Meteorological Society
    Abstract: ecent observations suggest that the export of Antarctic Bottom Water (AABW) from the Weddell Sea has a seasonal cycle in its temperature and salinity that is correlated with annual wind stress variations. This variability has been attributed to annual vertical excursions of the isopycnals in the Weddell Gyre, modifying the water properties at the depth of the Orkney Passage. Recent studies attribute these variations to locally wind-driven barotropic dynamics in the northern Weddell Sea boundary current. This paper explores an alternative mechanism in which the isopycnals respond directly to surface Ekman pumping, which is coupled to rapidly responding mesoscale eddy buoyancy fluxes near the gyre boundary. A conceptual model of the interface that separates Weddell Sea Deep Water from Circumpolar Deep Water is described in which the bounding isopycnal responds to a seasonal oscillation in the surface wind stress. Different parameterizations of the mesoscale eddy diffusivity are tested. The model accurately predicts the observed phases of the temperature and salinity variability in relationship to the surface wind stress. The model, despite its heavy idealization, also accounts for more than 50% of the observed oscillation amplitude, which depends on the strength of the seasonal wind variability and the parameterized eddy diffusivity. These results highlight the importance of mesoscale eddies in modulating the export of AABW in narrow boundary layers around the Antarctic margins.
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      An Idealized Model of Weddell Gyre Export Variability

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4226686
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    contributor authorSu, Zhan
    contributor authorStewart, Andrew L.
    contributor authorThompson, Andrew F.
    date accessioned2017-06-09T17:20:22Z
    date available2017-06-09T17:20:22Z
    date copyright2014/06/01
    date issued2014
    identifier issn0022-3670
    identifier otherams-83459.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4226686
    description abstractecent observations suggest that the export of Antarctic Bottom Water (AABW) from the Weddell Sea has a seasonal cycle in its temperature and salinity that is correlated with annual wind stress variations. This variability has been attributed to annual vertical excursions of the isopycnals in the Weddell Gyre, modifying the water properties at the depth of the Orkney Passage. Recent studies attribute these variations to locally wind-driven barotropic dynamics in the northern Weddell Sea boundary current. This paper explores an alternative mechanism in which the isopycnals respond directly to surface Ekman pumping, which is coupled to rapidly responding mesoscale eddy buoyancy fluxes near the gyre boundary. A conceptual model of the interface that separates Weddell Sea Deep Water from Circumpolar Deep Water is described in which the bounding isopycnal responds to a seasonal oscillation in the surface wind stress. Different parameterizations of the mesoscale eddy diffusivity are tested. The model accurately predicts the observed phases of the temperature and salinity variability in relationship to the surface wind stress. The model, despite its heavy idealization, also accounts for more than 50% of the observed oscillation amplitude, which depends on the strength of the seasonal wind variability and the parameterized eddy diffusivity. These results highlight the importance of mesoscale eddies in modulating the export of AABW in narrow boundary layers around the Antarctic margins.
    publisherAmerican Meteorological Society
    titleAn Idealized Model of Weddell Gyre Export Variability
    typeJournal Paper
    journal volume44
    journal issue6
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO-D-13-0263.1
    journal fristpage1671
    journal lastpage1688
    treeJournal of Physical Oceanography:;2014:;Volume( 044 ):;issue: 006
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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