The 1953–1965 rise in Atmospheric bomb 14C in Central Norway. Issue 6 (9th September 2019)

• Record Type: Journal Article
• Authors: Svarva, Helene; Grootes, Pieter; Seiler, Martin; Stene, Sølvi; Thun, Terje; Værnes, Einar; Nadeau, Marie-Josée
• Editors: Nadeau, Marie-Josée
• Is Part Of: Radiocarbon. Volume 61:Issue 6(2019)
• Page Start: 1765
• Page End: 1774
• Publication Date: 2019-09-09
• Subjects: AMS, -- bomb spike, -- radiocarbon, -- sub-annual measurements, -- tree rings; Radiocarbon dating -- Periodicals; 930.1028505
• DOI: 10.1017/RDC.2019.98
• Languages: English
• ISSNs: 0033-8222

Abstract

ABSTRACT: 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 14 CO2 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 ( 14 C) concentrations, caused by the first series of atmospheric nuclear weapons tests.