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    Seasonal overturning of the Labrador Sea as observed by Argo floats

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    jpo-d-17-0051.1.pdf (2.907Mb)
    Date
    2017-10-17
    Author
    Holte, James  Concept link
    Straneo, Fiamma  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/9399
    As published
    https://doi.org/10.1175/JPO-D-17-0051.1
    DOI
    10.1175/JPO-D-17-0051.1
    Keyword
     North Atlantic Ocean; Meridional overturning circulation; In situ oceanic observations; Seasonal cycle 
    Abstract
    Argo floats are used to investigate Labrador Sea overturning and its variability on seasonal time scales. This is the first application of Argo floats to estimate overturning in a deep-water formation region in the North Atlantic. Unlike hydrographic measurements, which are typically confined to the summer season, floats offer the advantage of collecting data in all seasons. Seasonal composite potential density and absolute geostrophic velocity sections across the mouth of the Labrador Sea assembled from float profiles and trajectories at 1000 m are used to calculate the horizontal and overturning circulations. The overturning exhibits a pronounced seasonal cycle; in depth space the overturning doubles throughout the course of the year, and in density space it triples. The largest overturning [1.2 Sv (1 Sv ≡ 106 m3 s−1) in depth space and 3.9 Sv in density space] occurs in spring and corresponds to the outflow of recently formed Labrador Sea Water. The overturning decreases through summer and reaches a minimum in winter (0.6 Sv in depth space and 1.2 Sv in density space). The robustness of the Argo seasonal overturning is supported by a comparison to an overturning estimate based on hydrographic data from the AR7W line.
    Description
    Author Posting. © American Meteorological Society, 2017. 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 Physical Oceanography 47 (2017): 2531-2543, doi:10.1175/JPO-D-17-0051.1.
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    • Physical Oceanography (PO)
    Suggested Citation
    Journal of Physical Oceanography 47 (2017): 2531-2543
     

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