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    Sources of dissolved inorganic carbon to the Canada Basin halocline : a multitracer study

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    Brown_et_al-2016-Journal_of_Geophysical_Research__Oceans.pdf (1.871Mb)
    Date
    2016-05-04
    Author
    Brown, Kristina A.  Concept link
    McLaughlin, Fiona A.  Concept link
    Tortell, Philippe D.  Concept link
    Yamamoto-Kawai, Michiyo  Concept link
    Francois, Roger  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/8472
    As published
    https://doi.org/10.1002/2015JC011535
    DOI
    10.1002/2015JC011535
    Keyword
     Arctic Ocean; Dissolved inorganic carbon; Nutrients; Stable isotopes; Shelf-basin CO2 pump 
    Abstract
    We examine the dissolved inorganic carbon maximum in the Canada Basin halocline using a suite of geochemical tracers to gain insight into the factors that contribute to the persistence of this feature. Hydrographic and geochemical samples were collected in the upper 500 m of the southwestern Canada Basin water column in the summer of 2008 and fall of 2009. These observations were used to identify conservative and nonconservative processes that contribute dissolved inorganic carbon to halocline source waters, including shelf sediment organic matter remineralization, air-sea gas exchange, and sea-ice brine export. Our results indicate that the remineralization of organic matter that occurs along the Bering and Chukchi Sea shelves is the overwhelming contributor of dissolved inorganic carbon to Pacific Winter Water that occupies the middle halocline in the southwestern Canada Basin. Nonconservative contributions from air-sea exchange and sea-ice brine are not significant. The broad salinity range associated with the DIC maximum, compared to the narrow salinity range of the nutrient maximum, is due to mixing between Pacific and Atlantic water and not abiotic addition of DIC.
    Description
    Author Posting. © American Geophysical Union, 2016. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 121 (2016): 2918–2936, doi:10.1002/2015JC011535.
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    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Journal of Geophysical Research: Oceans 121 (2016): 2918–2936
     

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