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    Radiocarbon in the Water Column of the Southwestern North Pacific Ocean—24 Years After Geosecs

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    Author
    Povinec, Pavel P.
    Aramaki, Takafumi
    Burr, George S.
    Jull, A. J. Timothy cc
    Kwong, Laval Liong Wee
    Togawa, Orihiko
    Issue Date
    2004-01-01
    
    Metadata
    Show full item record
    Citation
    Povinec, P. P., Aramaki, T., Burr, G. S., Jull, A. T., Kwong, L. L. W., & Togawa, O. (2004). Radiocarbon in the water column of the southwestern North Pacific Ocean—24 years after GEOSECS. Radiocarbon, 46(2), 583-594.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    Description
    From the 18th International Radiocarbon Conference held in Wellington, New Zealand, September 1-5, 2003.
    URI
    http://hdl.handle.net/10150/654916
    DOI
    10.1017/S0033822200035621
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    In the framework of the Worldwide Marine Radioactivity Studies (WOMARS) project, water profile samples for radiocarbon measurements were taken during the IAEA97 cruise at 10 stations in the southwestern North Pacific Ocean. While 14C concentrations were rapidly decreasing from the surface (∆14C about 100 ppm) down to about 800 m at all visited stations (∆14C about -200 ppm), the concentrations below 1000 m were almost constant. Some stations were in proximity to the GEOSECS stations sampled in 1973; thus, 14C profiles could be compared after a 24-yr interval. Generally, 14C concentrations had decreased in surface waters (by 50-80 ppm) and increased (by about the same amount) in intermediate waters when compared with GEOSECS data. In deep waters (below 1000 m), the observed 14C concentrations were similar to GEOSECS values. The bomb-produced 14C inventory had increased by more than 20% over the 24 yr from 1973 to 1997 and was estimated to be about (32 +/5) 10^12 atom m-2, with an annual 14C flux of (1.3 +/0.3) 10^12 atom m^-2 yr-1. The results suggest that bomb-produced 14C has been advected northwards by the Kuroshio Current and the Kuroshio Extension and stored in the intermediate layer as North Pacific Intermediate Water.
    Type
    Proceedings
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S0033822200035621
    Scopus Count
    Collections
    Radiocarbon, Volume 46, Number 2 (2004)

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