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    Formation and Maintenance of a Polynya in the Weddell Sea

    Source: Journal of Physical Oceanography:;1999:;Volume( 029 ):;issue: 006::page 1251
    Author:
    Timmermann, Ralph
    ,
    Lemke, Peter
    ,
    Kottmeier, Christoph
    DOI: 10.1175/1520-0485(1999)029<1251:FAMOAP>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: A dynamic?thermodynamic sea ice?mixed layer model for the Weddell Sea is complemented by a simple, diagnostic model to account for local sea ice?atmosphere interaction. To consider the atmospheric influence on the oceanic mixed layer, the pycnocline upwelling velocity is calculated using the theory of Ekman pumping. In several experiments, formation and conservation of a polynya in the Weddell Sea are investigated. Intrusion of heat into the lower atmosphere above the polynya area is assumed to cause a thermal perturbation and a cyclonic thermal wind field. Superposed with daily ECMWF surface winds, this modified atmospheric forcing field intensifies oceanic upwelling and induces divergent ice drift. Simulation results indicate that in case of a weak atmospheric cross-polynya flow the formation of a thermal wind field can significantly extend the lifetime of a large polynya. The repeated occurrence of the Weddell polynya in the years 1974?76 thus appears to be an effect of feedback mechanisms between sea ice, atmosphere, and oceanic mixed layer.
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      Formation and Maintenance of a Polynya in the Weddell Sea

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4166226
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    • Journal of Physical Oceanography

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    contributor authorTimmermann, Ralph
    contributor authorLemke, Peter
    contributor authorKottmeier, Christoph
    date accessioned2017-06-09T14:53:29Z
    date available2017-06-09T14:53:29Z
    date copyright1999/06/01
    date issued1999
    identifier issn0022-3670
    identifier otherams-29042.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4166226
    description abstractA dynamic?thermodynamic sea ice?mixed layer model for the Weddell Sea is complemented by a simple, diagnostic model to account for local sea ice?atmosphere interaction. To consider the atmospheric influence on the oceanic mixed layer, the pycnocline upwelling velocity is calculated using the theory of Ekman pumping. In several experiments, formation and conservation of a polynya in the Weddell Sea are investigated. Intrusion of heat into the lower atmosphere above the polynya area is assumed to cause a thermal perturbation and a cyclonic thermal wind field. Superposed with daily ECMWF surface winds, this modified atmospheric forcing field intensifies oceanic upwelling and induces divergent ice drift. Simulation results indicate that in case of a weak atmospheric cross-polynya flow the formation of a thermal wind field can significantly extend the lifetime of a large polynya. The repeated occurrence of the Weddell polynya in the years 1974?76 thus appears to be an effect of feedback mechanisms between sea ice, atmosphere, and oceanic mixed layer.
    publisherAmerican Meteorological Society
    titleFormation and Maintenance of a Polynya in the Weddell Sea
    typeJournal Paper
    journal volume29
    journal issue6
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(1999)029<1251:FAMOAP>2.0.CO;2
    journal fristpage1251
    journal lastpage1264
    treeJournal of Physical Oceanography:;1999:;Volume( 029 ):;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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