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    The Marine Radiocarbon Bomb Pulse across the Temperate North Atlantic: A Compilation of Δ14C Time Histories from Arctica islandica Growth Increments

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    Author
    Scourse, James D.
    Wanamaker, Alan D., Jr.
    Weidman, Chris
    Heinemeier, Jan
    Reimer, Paula J.
    Butler, Paul G.
    Witbaard, Rob
    Richardson, Christopher A.
    Issue Date
    2012-08-17
    
    Metadata
    Show full item record
    Citation
    Scourse, J. D., Wanamaker, A. D., Weidman, C., Heinemeier, J., Reimer, P. J., Butler, P. G., ... & Richardson, C. A. (2012). The marine radiocarbon bomb pulse across the temperate North Atlantic: A compilation of Δ 14 C time histories from Arctica islandica growth increments. Radiocarbon, 54(2), 165-186.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    URI
    http://hdl.handle.net/10150/654974
    DOI
    10.2458/azu_js_rc.v54i2.16026
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    Marine radiocarbon bomb-pulse time histories of annually resolved archives from temperate regions have been underexploited. We present here series of Δ14C excess from known-age annual increments of the long-lived bivalve mollusk Arctica islandica from 4 sites across the coastal North Atlantic (German Bight, North Sea; Tromsø, north Norway; Siglufjordur, north Icelandic shelf; Grimsey, north Icelandic shelf) combined with published series from Georges Bank and Sable Bank (NW Atlantic) and the Oyster Ground (North Sea). The atmospheric bomb pulse is shown to be a step-function whose response in the marine environment is immediate but of smaller amplitude and which has a longer decay time as a result of the much larger marine carbon reservoir. Attenuation is determined by the regional hydrographic setting of the sites, vertical mixing, processes controlling the isotopic exchange of 14C at the air-sea boundary, 14C content of the freshwater flux, primary productivity, and the residence time of organic matter in the sediment mixed layer. The inventories form a sequence from high magnitude-early peak (German Bight) to low magnitude-late peak (Grimsey). All series show a rapid response to the increase in atmospheric Δ14C excess but a slow response to the subsequent decline resulting from the succession of rapid isotopic air-sea exchange followed by the more gradual isotopic equilibration in the mixed layer due to the variable marine carbon reservoir and incorporation of organic carbon from the sediment mixed layer. The data constitute calibration series for the use of the bomb pulse as a high-resolution dating tool in the marine environment and as a tracer of coastal ocean water masses.
    Type
    Article
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.2458/azu_js_rc.v54i2.16026
    Scopus Count
    Collections
    Radiocarbon, Volume 54, Number 2 (2012)

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