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    Antarctic Radiocarbon Reservoir: The Case of the Mummified Crabeater Seals (Lobodon carcinophaga) in Bodman Cape, Seymour Island, Antarctica

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    Author
    Negrete, Javier
    Soibelzon, Esteban
    Tonni, Eduardo P.
    Carlini, Alejandro
    Soibelzon, Leopoldo H.
    Polja, Sebastian
    Huarte, Roberto A.
    Carbonari, Jorge E.
    Issue Date
    2011-01-01
    
    Metadata
    Show full item record
    Citation
    Negrete, J., Soibelzon, E., Tonni, E. P., Carlini, A., Soibelzon, L. H., Poljak, S., ... & Carbonari, J. E. (2011). Antarctic radiocarbon reservoir: The case of the mummified crabeater seals (Lobodon carcinophaga) in Bodman Cape, Seymour Island, Antarctica. Radiocarbon, 53(1), 161-166.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    URI
    http://hdl.handle.net/10150/654143
    DOI
    10.1017/S0033822200034433
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    The hypothesis is presented that an abrupt rise in atmospheric radiocarbon concentration evident in the Cariaco Basin varve record at 12,837 +/- 10 cal yr BP, contemporaneous with the Rancholabrean termination, may have been produced by a super-sized solar proton event (SPE) having a fluence of ~1.3 x 1011 protons/cm2. A SPE of this magnitude would have been large enough to deliver a lethal radiation dose of at least 3-6 Sv to the Earth's surface, and hence could have been a principal cause of the final termination of the Pleistocene megafauna and several genera of smaller mammals and birds. The event time-correlates with a large-magnitude acidity spike found at 1708.65 m in the GISP2 Greenland ice record, which is associated with high NO-3 ion concentrations and a rapid rise in 10Be deposition rate, all of which are indicators of a sudden cosmic-ray influx. The depletion of nitrate ions within this acidic ice layer suggests that the snowpack surface at that time was exposed to intense UV for a prolonged period, which is consistent with a temporary destruction of the polar ozone layer by solar cosmic rays. The acidity event also coincides with a large-magnitude, abrupt climatic excursion and is associated with elevated ammonium ion concentrations, an indicator of global fires.
    Type
    Article
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S0033822200034433
    Scopus Count
    Collections
    Radiocarbon, Volume 53, Number 1 (2011)

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