JpGU-AGU Joint Meeting 2017

Presentation information

[JJ] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS23] [JJ] Paleoclimatology and paleoceanography

Mon. May 22, 2017 1:45 PM - 3:15 PM IC (International Conference Hall 2F)

convener:Tomohisa Irino(Faculty of Environmental Earth Science, Hokkaido University), Akira Oka(Atmosphere and Ocean Research Institute, The University of Tokyo), Ikuko Kitaba(Research Centre for Palaleoclimatology, Ritsumeikan University), Masaki Sano(Research Institute for Humanity and Nature), Chairperson:Yusuke Okazaki(Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University)

2:30 PM - 2:45 PM

[MIS23-10] Climate variations in northern Japan as reconstructed from tree ring cellulose δ18O

★Invited papers

*Akane Tsushima1, Masaki Sano1, Takeshi Nakatsuka1, Zhen Li1, Motonari Ohyama2, Koh Yasue3 (1.Research Institute for Humanity and Nature, 2.Botanical Gardens, Tohoku University, 3.Shinshu University )

Keywords:Tree-ring cellulose δ18O, Japan

Tree-ring cellulose δ18O is known to be a promising proxy for reconstructing hydroclimate variations in monsoon Asia because the δ18O is not controlled by ecological factors but by two climatic parameters (i.e., relative humidity and δ18O of precipitation). In this study, two tree-ring δ18O series were developed by measuring two individual trees (Cryptomeria japonica) growing in Miyagi, northern Japan. Climatic response analyses reveal that the relationship between tree-ring δ18O and relative humidity is not temporally stable. Also, the tree-ring δ18O from Miyagi shows complex correlations with other tree-ring δ18O from Japan, indicating that tree-ring δ18O in northern Japan is not simply controlled by local hydroclimate. Continued effort toward the development of a dense tree-ring network will shed more light on variability of climate in Japan.