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    On the 14C and 39Ar Distribution in the Central Arctic Ocean: Implications for Deep Water Formation

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    Author
    Schlosser, Peter
    Kromer, Bernd
    Östlund, Gote
    Ekwurzel, Brenda
    Bönisch, Gerhard
    Loosli, H. H.
    Purtschert, Roland
    Issue Date
    1994-01-01
    Keywords
    isolation age
    Ar 39
    argon
    Amundsen Basin
    Makarov Basin
    Nansen Basin
    Arctic Ocean
    depth
    noble gases
    ocean circulation
    residence time
    sea water
    C 14
    carbon
    isotopes
    radioactive isotopes
    geochemistry
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    Citation
    Schlosser, P., Kromer, B., Östlund, G., Ekwurzel, B., Bönisch, G., Loosli, H. H., & Purtschert, R. (1994). On the 14C and 39Ar distribution in the central Arctic Ocean: Implications for deep water formation. Radiocarbon, 36(3), 327-343.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    URI
    http://hdl.handle.net/10150/653354
    DOI
    10.1017/S003382220001451X
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    We present Delta-14C and 39Ar data collected in the Nansen, Amundsen and Makarov basins during two expeditions to the central Arctic Ocean (RV Polarstern cruises ARK IV/3, 1987 and ARK VIII/3,1991). The data are used, together with published Delta-14C values, to describe the distribution of Delta-14C in all major basins of the Arctic Ocean (Nansen, Amundsen, Makarov and Canada Basins), as well as the 39Ar distribution in the Nansen Basin and the deep waters of the Amundsen and Makarov Basins. From the combined Delta-14C and 39Ar distributions, we derive information on the mean "isolation ages" of the deep and bottom waters of the Arctic Ocean. The data point toward mean ages of the bottom waters in the Eurasian Basin (Nansen and Amundsen Basins) of ca. 250-300 yr. The deep waters of the Amundsen Basin show slightly higher 3H concentrations than those in the Nansen Basin, indicating the addition of a higher fraction of water that has been at the sea surface during the past few decades. Correction for the bomb 14C added to the deep waters along with bomb 3H yields isolation ages for the bulk of the deep and bottom waters of the Amundsen Basin similar to those estimated for the Nansen Basin. This finding agrees well with the 39Ar data. Deep and bottom waters in the Canadian Basin (Makarov and Canada Basins) are very homogeneous, with an isolation age of ca. 450 yr. Delta-14C and 39Ar data and a simple inverse model treating the Canadian Basin Deep Water (CBDW) as one well-mixed reservoir renewed by a mixture of Atlantic Water (29%), Eurasian Basin Deep Water (69%) and brine-enriched shelf water (2%) yield a mean residence time of CBDW of ca. 300 yr.
    Type
    Article
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S003382220001451X
    Scopus Count
    Collections
    Radiocarbon, Volume 36, Number 3 (1994)

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