Japan Geoscience Union Meeting 2021

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[J] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS18] Drilling Earth Science

Fri. Jun 4, 2021 10:45 AM - 12:15 PM Ch.19 (Zoom Room 19)

convener:Junichiro Kuroda(Department of Ocean Floor Geoscience, Atmosphere and Ocean Research Institute, the University of Tokyo), Katsuyoshi Michibayashi(Department of Earth and Planetary Sciences, Nagoya University), Osamu Fujiwara(Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology), Kohtaro Ujiie(Faculty of Life and Environmental Sciences, University of Tsukuba), Chairperson:Junichiro Kuroda(Department of Ocean Floor Geoscience, Atmosphere and Ocean Research Institute, the University of Tokyo), Kazutaka Yasukawa(Frontier Research Center for Energy and Resources, School of Engineering, The University of Tokyo)

11:30 AM - 11:45 AM

[MIS18-04] SCORE proposal off Shikoku, SW Japan: Reconstruction of the Kuroshio state for super interglacials during the Brunhes chron

*Minoru Ikehara1, Hiroshi Nishi2, Tabito Matsu'ura, Kyoko Hagino1, Takuya Itaki3, Kyung Eun Lee4, Yuan-Pin Chang5, Jianjun Zou6 (1.Center for Advanced Marine Core Research, Kochi University, 2.Fukui Prefectural University, 3.AIST, 4.Korea Maritime and Ocean University, 5.National Sun Yat-sen University, 6.First Institute of Oceanography)

Keywords:Kuroshio, SCORE, super interglacial, tephrostratigraphy

We propose to drill at site SKK-02 (32°26.48’N, 133°13.67’E, 2,877m) off Shikoku in the Northwest Pacific to reconstruct high-resolution variability of the Kuroshio Current (KC) for the past super interglacials. The KC is a strong western boundary current and supplies heat and water vapor to the subarctic from the tropical Pacific, influencing climate conditions over the East Asia including the Japanese Islands. The past “super interglacials” are thought to be important analogues for the future global warming climate. However, there are no reliable information on the heat transport and temperature of the KC during the super interglacials due to a lack of the suitable sediment cores from the Northwest Pacific. The Mid-Brunhes Event (MBE) is a climate shift in the Brunhes chron and correspond to the transition between MIS 12 and MIS 11. It is characterized by a clear increase in atmospheric CO2 and polar ice volume. It is also important to understand the state of the KC for the MBE. In this proposal, we show the following scientific objective.

Main Objective: How does the Kuroshio respond to “super interglacials” compared to today and to Mid-Brunhes Event with different atmospheric CO2 level?

In addition, we would like to investigate the detailed tephrostratigraphy from caldera volcano in Kyushu Island since the obtained sediment cores should have many volcanic ashes.