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    The Passage of the Bomb Radiocarbon Pulse into the Pacific Ocean

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    Author
    Jenkins, William J.
    Elder, Kathryn L.
    McNichol, Ann P.
    Von Reden, Karl
    Issue Date
    2010-01-01
    
    Metadata
    Show full item record
    Citation
    Jenkins, W. J., Elder, K. L., McNichol, A. P., & von Reden, K. (2010). The passage of the bomb radiocarbon pulse into the Pacific Ocean. Radiocarbon, 52(3), 1182-1190.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    Description
    From the 20th International Radiocarbon Conference held in Kona, Hawaii, USA, May 31-June 3, 2009.
    URI
    http://hdl.handle.net/10150/654369
    DOI
    10.1017/S0033822200046257
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    We report and compare radiocarbon observations made on 2 meridional oceanographic sections along 150 degrees W in the South Pacific in 1991 and 2005. The distributions reflect the progressive penetration of nuclear weapons-produced 14C into the oceanic thermocline. The changes over the 14 yr between occupations are demonstrably large relative to any possible drift in our analytical standardization. The computed difference field based on the gridded data in the upper 1600 m of the section exhibits a significant decrease over time (approaching 40 to 50 in ∆14C) in the upper 200-300 m, consistent with the decadal post-bomb decline in atmospheric 14C levels. A strong positive anomaly (increase with time), centered on the low salinity core of the Antarctic Intermediate Water (AAIW), approaches 50-60‰ in ∆14C, a clear signature of the downstream evolution of the 14C transient in this water mass. We use this observation to estimate the transit time of AAIW from its "source region" in the southeast South Pacific and to compute the effective reservoir age of this water mass. The 2 sections show small but significant changes in the abyssal 14C distributions. Between 1991 and 2005, ∆14C has increased by 9 below 2000 m north of 55 degrees S. This change is accompanied overall by a modest increase in salinity and dissolved oxygen, as well as a slight decrease in dissolved silica. Such changes are indicative of greater ventilation. Calculation of "phosphate star" also indicates that this may be due to a shift from the Southern Ocean toward North Atlantic Deep Water as the ventilation source of the abyssal South Pacific.
    Type
    Proceedings
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S0033822200046257
    Scopus Count
    Collections
    Radiocarbon, Volume 52, Number 3 (2010)

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