Japan Geoscience Union Meeting 2019

Presentation information

[J] Poster

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS17] History X Earth and Planetary Science

Mon. May 27, 2019 3:30 PM - 5:00 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Yasuyuki Kano(Earthquake Research Institute, The University of Tokyo), Kei Yoshimura(Institute of Industrial Science, The University of Tokyo), Hiroaki Isobe(Faculty of Fine Arts, Kyoto City University of Arts), kiyomi iwahashi(National Institute of Japanese Literature)

[MIS17-P11] Radiocarbon dating of Japanese tree rings – chronological research and Japanese calibration curve

*Minoru Sakamoto1,2, Masataka Hakozaki1, Takumi Mitsutani3, Takeshi Nakatsuka4,5 (1.National Museum of Japanese History, 2.The Graduate University for Advanced Studies, 3.Nara National Research Institute for Cultural Properties, 4.Research Institute for Humanity and Nature, 5.Nagoya University)

Keywords:radiocarbon dating, dendrochronology, calibrated age, regional effect

In order to revise radiocarbon age to calendar age, a calibration curve based on the radiocarbon ages of known age sample such as tree rings is used. Calibration curve for the northern hemisphere, IntCal, mainly depended on tree rings which had been growing in the high latitude region of the West so far. However, the latest version “IntCal19” is called upon to reflect radiocarbon ages of various regions.
The authors have continued radiocarbon dating of Japanese tree rings of the past 3,000 years. Recently, from a demand for chronological research on wooden buildings as cultural properties using 14C-wiggle matching, we are also focusing on the tree rings of middle to early-modern ages. In the background, there is a practical application of a new method, oxygen-isotope dendrochronology, that can be implemented in several tree species. It becomes easier to obtain tree rings with known age and accumulation of radiocarbon age is progressing rapidly.
There are some periods showing certain offset on radiocarbon ages of Japanese tree ring from IntCal. One of the regional effects is remarkable during the end of the Yayoi to the beginning of the Kofun period, and calibrated age based on IntCal shows older age than the actual age. Also, since IntCal is versatile and smooth, it is sometimes insufficient for the historic chronological research that requires high precision and accuracy. It has an obligation to reveal the behavior of the radiocarbon age of Japanese tree ring and develop domestic calibration curve to promote chronological research.
This work was one of the results of the Collaborative Research Program of the NMJH and the RIHN Research Project of the Ecohistory Program (H-05). JSPS Grant in Aid (#25282075, #18H03594) also supported our research.