Onset and evolution of millennial-scale variability of East Asian Monsoon recorded in the Japan Sea sediments: New data with new interpretation

Ryuji Tada; Tomohisa Irino; Arisa Seki; Masafumi Murayama; Kaz Mitake; Masayuki Ikeda

Presentation information

[E] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS03] Evolution and variability of the Asian monsoon in Cenozoic global climate changes

Thu. May 30, 2019 3:30 PM - 5:00 PM 304 (3F)

convener:Masanobu Yamamoto(Faculty of Environmental Earth Science, Hokkaido University), Ryuji Tada(Department of Earth and Planetary Science, Graduate School of Science, The Univeristy of Tokyo), Chairperson:Ryuji Tada(The University of Tokyo), Yoshimi Kubota(National Science Museum), Masanobu Yamamoto(Hokkaido University)

4:05 PM - 4:20 PM

[MIS03-08] Onset and evolution of millennial-scale variability of East Asian Monsoon recorded in the Japan Sea sediments: New data with new interpretation

*Ryuji Tada¹, Tomohisa Irino², Arisa Seki³, Masafumi Murayama⁴, Kaz Mitake¹, Masayuki Ikeda⁵ (1.Department of Earth and Planetary Science, Graduate School of Science, The Univeristy of Tokyo, 2.Faculty of Environmental Earth Science, Hokkaido University, 3.Faculty of Science, Shinshu University, 4.Faculty of Agriculture and Marine Science, 5.Shizuoka University)

Keywords:East Asian Summer Monsoon, Japan Sea

New XRF scanner data from U1426 on Oki Ridge and comparison with those of the deeper sites U1424 and 1425 revealed Br (MOC proxy) profile of deeper sites are significantly influenced by post-depositional oxidation during the early diagenesis while Br profile of shallower site (U1426) better preserve surface productivity signal. Thus we use Br profile of U1426 during the last 3 Ma to analyze past changes in millennial-scale variability of East Asian Summer Monsoon intensity and the response of the Japan Sea to such changes. The result suggests several new information which will be presented at 2019JpGU.