Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS10] Paleoclimatology and paleoceanography

Thu. May 24, 2018 10:45 AM - 12:15 PM A07 (Tokyo Bay Makuhari Hall)

convener:Yusuke Okazaki(Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University), Atsuhiko Isobe(Research Institute for Applied Mechanics, Kyushu University), Akihisa Kitamura(静岡大学理学部地球科学教室, 共同), Masaki Sano(Faculty of Human Sciences, Waseda University), Hitoshi Hasegawa(Faculty of Science and Technology, Kochi University), Akira Oka(Atmosphere and Ocean Research Institute, The University of Tokyo), Michinobu Kuwae(Center for Marine Environmental Studies), Chairperson:Isobe Atsuhiko(九州大学 応用力学研究所)

11:45 AM - 12:00 PM

[MIS10-22] Climate variability over 393 years inferred from tree-ring oxygen isotope records of Tateyama Sugi in Hokuriku of Japan

*Zhen Li1, Takeshi Nakatsuka1, Masaki Sano2, Akane Tsushima1 (1.Research Institute for Humanity and Nature, 2.Waseda University)

Keywords:Tree-ring oxygen isotope, Tateyama Sugi, Climate variability

The annual oxygen isotope (δ18O) record covering the period between 1621 and 2013 recovered from the tree-ring cellulose of trees growing in Tateyama in Hokuriku of Japan. The tree-ring δ18O chronology was based on samples obtained from four living Sugi (Cryptomeria japonica). The tree-ring cellulose δ18O record is negatively correlated with relative humidity in summer (particularly in June), and also (though less so) with summer precipitation. However, the correlation coefficient related to relative humidity is variable and has been increasingly robust in nearly three decades. This non-stationary relationship between tree-ring δ18O and relative humidity during different periods might be related to the location and moisture supply of Baiu front which can affect the isotope fractionation. Furthermore, compared with the climate influences inferred from oxygen isotope records of trees in southwestern Japan, the different responses of tree-ring cellulose δ18O to the precipitation and relative humidity in Hokuriku area and southwestern Japan can be found, and the causes were discussed.