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    Structure and forcing of observed exchanges across the Greenland–Scotland Ridge

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    jcli-d-17-0889.1.pdf (3.204Mb)
    Date
    2018-11-19
    Author
    Bringedal, Carina  Concept link
    Eldevik, Tor  Concept link
    Skagseth, Øystein  Concept link
    Spall, Michael A.  Concept link
    Østerhus, Svein  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/10770
    As published
    https://doi.org/10.1175/JCLI-D-17-0889.1
    DOI
    10.1175/JCLI-D-17-0889.1
    Keyword
     Ocean circulation; Thermocline circulation; Atmosphere-ocean interaction; North Atlantic Oscillation; Statistical techniques; Time series 
    Abstract
    The Atlantic meridional overturning circulation and associated poleward heat transport are balanced by northern heat loss to the atmosphere and corresponding water-mass transformation. The circulation of northward-flowing Atlantic Water at the surface and returning overflow water at depth is particularly manifested—and observed—at the Greenland–Scotland Ridge where the water masses are guided through narrow straits. There is, however, a rich variability in the exchange of water masses across the ridge on all time scales. Focusing on seasonal and interannual time scales, and particularly the gateways of the Denmark Strait and between the Faroe Islands and Shetland, we specifically assess to what extent the exchanges of water masses across the Greenland–Scotland Ridge relate to wind forcing. On seasonal time scales, the variance explained of the observed exchanges can largely be related to large-scale wind patterns, and a conceptual model shows how this wind forcing can manifest via a barotropic, cyclonic circulation. On interannual time scales, the wind stress impact is less direct as baroclinic mechanisms gain importance and observations indicate a shift in the overflows from being more barotropically to more baroclinically forced during the observation period. Overall, the observed Greenland–Scotland Ridge exchanges reflect a horizontal (cyclonic) circulation on seasonal time scales, while the interannual variability more represents an overturning circulation.
    Description
    Author Posting. © American Meteorological Society, 2018. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Climate 31 (2018): 9881-9901, doi:10.1175/JCLI-D-17-0889.1.
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    • Physical Oceanography (PO)
    Suggested Citation
    Journal of Climate 31 (2018): 9881-9901
     

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