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    Causes of Changes in the Denmark Strait Overflow

    Source: Journal of Physical Oceanography:;2007:;Volume( 037 ):;issue: 006::page 1678
    Author:
    Köhl, Armin
    ,
    Käse, Rolf H.
    ,
    Stammer, Detlef
    ,
    Serra, Nuno
    DOI: 10.1175/JPO3080.1
    Publisher: American Meteorological Society
    Abstract: The warming Nordic seas potentially tend to decrease the overflow across the Greenland?Iceland?Scotland Ridge (GISR) system. Recent observations by Macrander et al. document a significant drop in the intensity of outflowing Denmark Strait Overflow Water of more than 20% over 3 yr and a simultaneous increase in the temperature of the bottom layers of more than 0.4°C. A simulation of the exchange across the GISR with a regional ocean circulation model is used here to identify possible mechanisms that control changes in the Denmark Strait overflow and its relations to changed forcing condition. On seasonal and longer time scales, the authors establish links of the overflow anomalies to a decreasing capacity of the dense water reservoir caused by a change of circulation pattern north of the sill. On annual and shorter time scales, the wind stress curl around Iceland determines the barotropic circulation around the island and thus the barotropic flow through Denmark Strait. For the overlapping time scales, the barotropic and overflow component interactively determine transport variations. Last, a relation between sea surface height and reservoir height changes upstream of the sill is used to predict the overflow variability from altimeter data. Estimated changes are in agreement with other recent transport estimates based on current-meter arrays.
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      Causes of Changes in the Denmark Strait Overflow

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4226126
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    contributor authorKöhl, Armin
    contributor authorKäse, Rolf H.
    contributor authorStammer, Detlef
    contributor authorSerra, Nuno
    date accessioned2017-06-09T17:18:40Z
    date available2017-06-09T17:18:40Z
    date copyright2007/06/01
    date issued2007
    identifier issn0022-3670
    identifier otherams-82955.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4226126
    description abstractThe warming Nordic seas potentially tend to decrease the overflow across the Greenland?Iceland?Scotland Ridge (GISR) system. Recent observations by Macrander et al. document a significant drop in the intensity of outflowing Denmark Strait Overflow Water of more than 20% over 3 yr and a simultaneous increase in the temperature of the bottom layers of more than 0.4°C. A simulation of the exchange across the GISR with a regional ocean circulation model is used here to identify possible mechanisms that control changes in the Denmark Strait overflow and its relations to changed forcing condition. On seasonal and longer time scales, the authors establish links of the overflow anomalies to a decreasing capacity of the dense water reservoir caused by a change of circulation pattern north of the sill. On annual and shorter time scales, the wind stress curl around Iceland determines the barotropic circulation around the island and thus the barotropic flow through Denmark Strait. For the overlapping time scales, the barotropic and overflow component interactively determine transport variations. Last, a relation between sea surface height and reservoir height changes upstream of the sill is used to predict the overflow variability from altimeter data. Estimated changes are in agreement with other recent transport estimates based on current-meter arrays.
    publisherAmerican Meteorological Society
    titleCauses of Changes in the Denmark Strait Overflow
    typeJournal Paper
    journal volume37
    journal issue6
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO3080.1
    journal fristpage1678
    journal lastpage1696
    treeJournal of Physical Oceanography:;2007:;Volume( 037 ):;issue: 006
    contenttypeFulltext
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