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)

10:15 AM - 10:30 AM

[MIS17-18] Heinrich events and last glacial recorded in a stalagmite from Mie Prefecture, Japan

*Taiki Mori1, Akihiro Kano1, Hu Hsun-Ming2, Shen Chuan-Chou2, Kenji Kashiwagi3 (1.Kyushu Univ., 2.National Taiwan Univ., 3.Toyama Univ.)

Stalagmites record physicochemical conditions in isotope and elemental composition in their carbonate fraction. Here, we investigate 10-cm-long stalagmite KA03 collected from Kiriana cave in Mie Prefecture. This stalagmite has high concentration of uranium and provides accurate U-Th ages. Results of dating show that the stalagmite has been growing during the last 80 kyr almost continuously. The oxygen isotopic curve of KA03 generally follows the records from the Chinese caves and Greenland ice-sheets in terms of 1) drastic decrease at the B/A warming, and 2) high isotopic intervals corresponding to the Heinrich events. However, KA03 lacks the millennium changes of Dansgaard-Oeschger cycles, which have been reported in a stalagmite from Gifu Prefecture. A distinct feature of KA03 oxygen isotope is a linear increase from 37 ka to the Last Glacial Maximum (LGM). Assuming that the isotope is a proxy of humidity, the amount of rainfall had been decreasing from 37 ka to LGM. Because the locality is generally dry in winter season, the stalagmite KA03 is a significant record of the East Asian summer monsoon.