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1 results

  • The 1953–1965 rise in Atmospheric bomb 14C in Central Norway

  • Helene Svarva, Pieter Grootes, Martin Seiler, Sølvi Stene, Terje Thun, Einar Værnes, Marie-Josée Nadeau
  • Journal:
    Radiocarbon / Volume 61 / Issue 6 / December 2019
    Published online by Cambridge University Press:
    09 September 2019, pp. 1765-1774
    Print publication:
    December 2019

  • Sub-annual measurements, eight increments per year, of cellulose in a Scots pine tree growing in central Norway are presented as a proxy for tropospheric 14CO2 at biweekly to monthly resolution. The results are validated by comparison to direct atmospheric measurements in the years 1959–1965, and a new dataset is obtained for 1953–1958. In this period, our cellulose measurements deviate from the Bomb 13 NH1 calibration curve, which is derived from single-year measurements of tree rings. This is due to seasonal cycles in tropospheric radiocarbon (14C) concentrations, caused by the first series of atmospheric nuclear weapons tests.