Variation of 14C in Japanese Tree Rings Related to the Fukushima Nuclear Accident

Tamás Varga, László Palcsu, Tomoko Ohta, Yasunori Mahara, A.J. Timothy Jull, Mihály Molnár

Research output: Contribution to journalArticle

Abstract

Radiocarbon (14C) analysis was performed on Japanese cedar (Cryptomeria japonica) tree rings from Koriyama, Fukushima prefecture. Our primary aim was to detect any 14C release from the Fukushima Dai-ichi nuclear power plant accident on 11 March 2011. We also completed and assessed the 14C level in Japanese tree rings for the period of 1990-2014 because of the lack of environmental 14C results in the Japanese island that time. For this reason, we used a trajectory model to investigate the air mass forward and backward trajectories at the area of the power plant and sampling site. The modeling data show that the air masses mainly moved to the Pacific Ocean, both during March 2011 and during the growing season (March-September). During the period 1990-2014 there was no significant 14C excess in any of the samples, but there was a detectable Suess effect in almost every tree ring sample. The average fossil contribution was 0.83 ± 0.01% and the calculated anthropogenic component ratio, the 14C excess varied between +0.5 and -1.6%. The Δ14C value decreased from 150.0‰ to 9.5‰ from 1990-2014, which follows the decline of the 14C bomb peak, in addition to any detectable Suess effect.

Original languageEnglish (US)
Pages (from-to)1029-1040
Number of pages12
JournalRadiocarbon
Volume61
Issue number4
DOIs
StatePublished - Aug 1 2019

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nuclear accident
tree ring
air mass
trajectory
nuclear power plant
accident
power plant
growing season
fossil
sampling
ocean
modeling
Accidents
Tree Rings
effect

Keywords

  • Fukushima
  • HYSPLIT
  • nuclear accident
  • radiocarbon
  • tree rings

ASJC Scopus subject areas

  • Archaeology
  • Earth and Planetary Sciences(all)

Cite this

Variation of 14C in Japanese Tree Rings Related to the Fukushima Nuclear Accident. / Varga, Tamás; Palcsu, László; Ohta, Tomoko; Mahara, Yasunori; Jull, A.J. Timothy; Molnár, Mihály.

In: Radiocarbon, Vol. 61, No. 4, 01.08.2019, p. 1029-1040.

Research output: Contribution to journalArticle

Varga, T, Palcsu, L, Ohta, T, Mahara, Y, Jull, AJT & Molnár, M 2019, 'Variation of 14C in Japanese Tree Rings Related to the Fukushima Nuclear Accident', Radiocarbon, vol. 61, no. 4, pp. 1029-1040. https://doi.org/10.1017/RDC.2019.47
Varga, Tamás ; Palcsu, László ; Ohta, Tomoko ; Mahara, Yasunori ; Jull, A.J. Timothy ; Molnár, Mihály. / Variation of 14C in Japanese Tree Rings Related to the Fukushima Nuclear Accident. In: Radiocarbon. 2019 ; Vol. 61, No. 4. pp. 1029-1040.
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