Japan Geoscience Union Meeting 2016

Presentation information


Symbol M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS17] Paleoclimatology and paleoceanography

Tue. May 24, 2016 9:00 AM - 10:30 AM A04 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Tomohisa Irino(Faculty of Environmental Earth Science, Hokkaido University), Minoru Ikehara(Center for Advanced Marine Core Research, Kochi University), Akira Oka(Atmosphere and Ocean Research Institute, The University of Tokyo), Yusuke Okazaki(Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University), Ikuko Kitaba(Research Centre for Palaleoclimatology, Ritsumeikan University), Akihisa Kitamura(Institute of Geosciences, Faculty of Science, Shizuoka University), Masaki Sano(Research Institute for Humanity and Nature), Ryuji Tada(Department of Earth and Planetary Science, Graduate School of Science, The Univeristy of Tokyo), Takeshi Nakagawa(Ritsumeikan University), Akira Hayashida(Department of Environmental Systems Science, Doshisha University), Chair:Akira Hayashida(Department of Environmental Systems Science, Doshisha University)

9:30 AM - 9:45 AM

[MIS17-15] Present situation and future prospects of the oxygen isotope ratio dendrochronology in the northeastern Japan

*Masataka Hakozaki1, Katsuhiko Kimura2, Masaki Sano3, Takeshi Nakatsuka3 (1.National Museum of Japanese History, 2.Faculty of Symbiotic Systems Science, Fukushima University, 3.Research Institute for Humanity and Nature)

Keywords:Tree-rings, Oxygen isotope ratio, Climate reconstruction

Oxygen isotope ratio (δ18O) dendrochronology has the potential to be conveniently and accurately dating a variety of tree species of old wood material (old building materials, woody remains and natural buried woods). For this reason, δ18O dendrochronology has been attracting attention as a new dating method in various fields of history, archaeology and geology (Nakatsuka & Sano 2014). Building of tree-ring δ18O master chronology mainly has progressed in the central and western Japan, reaching already 4300 years ago in some areas (Kimura et al. 2014). On the other hand, it has been delayed in northeastern Japan. Therefore, in this region, the major part of the historical era remained blank data. Because of tree-ring δ18O is defined in the precipitation and relative humidity of the growing environment, dating is difficult in between the master chronology and old wood material of different rainfall pattern area. Since northeastern Japan is affected by the northeast wind that coming from Okhotsk high in the summer, it is desirable to build independent master chronology (Nakatsuka 2015).
In view of this situation, we has been working on the tree-ring δ18O analysis of the woody remains and natural buried woods from Aomori Prefecture to Niigata Prefecture. As a result, it succeeded to get in nearly consecutive tree-ring δ18O data over 1200 years of 5-16 century.
As a result of comparing this data with the existing central Japan δ18O standard annual ring curve, we found common components on these. Now, we are concidering the reconstruction of the climate field from the spatial pattern of tree-ring δ18O. In this report, we describes an overview of these surveys and analysis, the future prospects.