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    Circulation and Stirring in the Southeast Pacific Ocean and the Scotia Sea Sectors of the Antarctic Circumpolar Current

    Source: Journal of Physical Oceanography:;2016:;Volume( 046 ):;issue: 007::page 2005
    Author:
    Balwada, Dhruv
    ,
    Speer, Kevin G.
    ,
    LaCasce, Joseph H.
    ,
    Owens, W. Brechner
    ,
    Marshall, John
    ,
    Ferrari, Raffaele
    DOI: 10.1175/JPO-D-15-0207.1
    Publisher: American Meteorological Society
    Abstract: he large-scale middepth circulation and eddy diffusivities in the southeast Pacific Ocean and Scotia Sea sectors between 110° and 45°W of the Antarctic Circumpolar Current (ACC) are described based on a subsurface quasi-isobaric RAFOS-float-based Lagrangian dataset. These RAFOS float data were collected during the Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean (DIMES). The mean flow, adjusted to a common 1400-m depth, shows the presence of jets in the time-averaged sense with speeds of 6 cm s?1 in the southeast Pacific Ocean and upward of 13 cm s?1 in the Scotia Sea. These jets appear to be locked to topography in the Scotia Sea but, aside from negotiating a seamount chain, are mostly free of local topographic constraints in the southeast Pacific Ocean. The eddy kinetic energy (EKE) is higher than the mean kinetic energy everywhere in the sampled domain by about 50%. The magnitude of the EKE increases drastically (by a factor of 2 or more) as the current crosses over the Hero and Shackleton fracture zones into the Scotia Sea. The meridional isopycnal stirring shows lateral and vertical variations with local eddy diffusivities as high as 2800 ± 600 m2 s?1 at 700 m decreasing to 990 ± 200 m2 s?1 at 1800 m in the southeast Pacific Ocean. However, the cross-ACC diffusivity in the southeast Pacific Ocean is significantly lower, with values of 690 ± 150 and 1000 ± 200 m2 s?1 at shallow and deep levels, respectively, due to the action of jets. The cross-ACC diffusivity in the Scotia Sea is about 1200 ± 500 m2 s?1.
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      Circulation and Stirring in the Southeast Pacific Ocean and the Scotia Sea Sectors of the Antarctic Circumpolar Current

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4227121
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    • Journal of Physical Oceanography

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    contributor authorBalwada, Dhruv
    contributor authorSpeer, Kevin G.
    contributor authorLaCasce, Joseph H.
    contributor authorOwens, W. Brechner
    contributor authorMarshall, John
    contributor authorFerrari, Raffaele
    date accessioned2017-06-09T17:21:53Z
    date available2017-06-09T17:21:53Z
    date copyright2016/07/01
    date issued2016
    identifier issn0022-3670
    identifier otherams-83851.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4227121
    description abstracthe large-scale middepth circulation and eddy diffusivities in the southeast Pacific Ocean and Scotia Sea sectors between 110° and 45°W of the Antarctic Circumpolar Current (ACC) are described based on a subsurface quasi-isobaric RAFOS-float-based Lagrangian dataset. These RAFOS float data were collected during the Diapycnal and Isopycnal Mixing Experiment in the Southern Ocean (DIMES). The mean flow, adjusted to a common 1400-m depth, shows the presence of jets in the time-averaged sense with speeds of 6 cm s?1 in the southeast Pacific Ocean and upward of 13 cm s?1 in the Scotia Sea. These jets appear to be locked to topography in the Scotia Sea but, aside from negotiating a seamount chain, are mostly free of local topographic constraints in the southeast Pacific Ocean. The eddy kinetic energy (EKE) is higher than the mean kinetic energy everywhere in the sampled domain by about 50%. The magnitude of the EKE increases drastically (by a factor of 2 or more) as the current crosses over the Hero and Shackleton fracture zones into the Scotia Sea. The meridional isopycnal stirring shows lateral and vertical variations with local eddy diffusivities as high as 2800 ± 600 m2 s?1 at 700 m decreasing to 990 ± 200 m2 s?1 at 1800 m in the southeast Pacific Ocean. However, the cross-ACC diffusivity in the southeast Pacific Ocean is significantly lower, with values of 690 ± 150 and 1000 ± 200 m2 s?1 at shallow and deep levels, respectively, due to the action of jets. The cross-ACC diffusivity in the Scotia Sea is about 1200 ± 500 m2 s?1.
    publisherAmerican Meteorological Society
    titleCirculation and Stirring in the Southeast Pacific Ocean and the Scotia Sea Sectors of the Antarctic Circumpolar Current
    typeJournal Paper
    journal volume46
    journal issue7
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO-D-15-0207.1
    journal fristpage2005
    journal lastpage2027
    treeJournal of Physical Oceanography:;2016:;Volume( 046 ):;issue: 007
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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