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    On the Seasonal Cycles Observed at the Continental Slope of the Eastern Eurasian Basin of the Arctic Ocean

    Source: Journal of Physical Oceanography:;2018:;volume 048:;issue 007::page 1451
    Author:
    Baumann, Till M.
    ,
    Polyakov, Igor V.
    ,
    Pnyushkov, Andrey V.
    ,
    Rember, Robert
    ,
    Ivanov, Vladimir V.
    ,
    Alkire, Matthew B.
    ,
    Goszczko, Ilona
    ,
    Carmack, Eddy C.
    DOI: 10.1175/JPO-D-17-0163.1
    Publisher: American Meteorological Society
    Abstract: AbstractThe Eurasian Basin (EB) of the Arctic Ocean is subject to substantial seasonality. We here use data collected between 2013 and 2015 from six moorings across the continental slope in the eastern EB and identify three domains, each with its own unique seasonal cycle: 1) The upper ocean (<100 m), with seasonal temperature and salinity differences of ?? = 0.16°C and ?S = 0.17, is chiefly driven by the seasonal sea ice cycle. 2) The upper-slope domain is characterized by the influence of a hydrographic front that spans the water column around the ~750-m isobath. The domain features a strong temperature and moderate salinity seasonality (?? = 1.4°C; ?S = 0.06), which is traceable down to ~600-m depth. Probable cause of this signal is a combination of along-slope advection of signals by the Arctic Circumpolar Boundary Current, local wind-driven upwelling, and a cross-slope shift of the front. 3) The lower-slope domain, located offshore of the front, with seasonality in temperature and salinity mainly confined to the halocline (?? = 0.83°C; ?S = 0.11; ~100?200 m). This seasonal cycle can be explained by a vertical isopycnal displacement (?Z ~ 36 m), arguably as a baroclinic response to sea level changes. Available long-term oceanographic records indicate a recent amplification of the seasonal cycle within the halocline layer, possibly associated with the erosion of the halocline. This reduces the halocline?s ability to isolate the ocean surface layer and sea ice from the underlying Atlantic Water heat with direct implications for the evolution of Arctic sea ice cover and climate.
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      On the Seasonal Cycles Observed at the Continental Slope of the Eastern Eurasian Basin of the Arctic Ocean

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    contributor authorBaumann, Till M.
    contributor authorPolyakov, Igor V.
    contributor authorPnyushkov, Andrey V.
    contributor authorRember, Robert
    contributor authorIvanov, Vladimir V.
    contributor authorAlkire, Matthew B.
    contributor authorGoszczko, Ilona
    contributor authorCarmack, Eddy C.
    date accessioned2019-09-19T10:02:36Z
    date available2019-09-19T10:02:36Z
    date copyright5/2/2018 12:00:00 AM
    date issued2018
    identifier otherjpo-d-17-0163.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4260900
    description abstractAbstractThe Eurasian Basin (EB) of the Arctic Ocean is subject to substantial seasonality. We here use data collected between 2013 and 2015 from six moorings across the continental slope in the eastern EB and identify three domains, each with its own unique seasonal cycle: 1) The upper ocean (<100 m), with seasonal temperature and salinity differences of ?? = 0.16°C and ?S = 0.17, is chiefly driven by the seasonal sea ice cycle. 2) The upper-slope domain is characterized by the influence of a hydrographic front that spans the water column around the ~750-m isobath. The domain features a strong temperature and moderate salinity seasonality (?? = 1.4°C; ?S = 0.06), which is traceable down to ~600-m depth. Probable cause of this signal is a combination of along-slope advection of signals by the Arctic Circumpolar Boundary Current, local wind-driven upwelling, and a cross-slope shift of the front. 3) The lower-slope domain, located offshore of the front, with seasonality in temperature and salinity mainly confined to the halocline (?? = 0.83°C; ?S = 0.11; ~100?200 m). This seasonal cycle can be explained by a vertical isopycnal displacement (?Z ~ 36 m), arguably as a baroclinic response to sea level changes. Available long-term oceanographic records indicate a recent amplification of the seasonal cycle within the halocline layer, possibly associated with the erosion of the halocline. This reduces the halocline?s ability to isolate the ocean surface layer and sea ice from the underlying Atlantic Water heat with direct implications for the evolution of Arctic sea ice cover and climate.
    publisherAmerican Meteorological Society
    titleOn the Seasonal Cycles Observed at the Continental Slope of the Eastern Eurasian Basin of the Arctic Ocean
    typeJournal Paper
    journal volume48
    journal issue7
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO-D-17-0163.1
    journal fristpage1451
    journal lastpage1470
    treeJournal of Physical Oceanography:;2018:;volume 048:;issue 007
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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