Japan Geoscience Union Meeting 2015

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Oral

Symbol M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS28] High-resolution paleoclimate observatory network in East Asia-NW Pacific region

Wed. May 27, 2015 11:00 AM - 12:45 PM 202 (2F)

Convener:*Ryuji Tada(Department of Earth and Planetary Science, Graduate School of Science, The Univeristy of Tokyo), Takeshi Nakagawa(Ritsumeikan University), Ken Ikehara(Institute of Geology and Geoinformation, National Institute of Advanced Industrial Science and Technology), Masanobu Yamamoto(Faculty of Environmental Earth Science, Hokkaido University), Chair:Kana Nagashima(Japan Agency for Marine-Earth Science and Technology, Research and Development Center for Global Change)

11:35 AM - 11:50 AM

[MIS28-03] Spatial-temporal reconstruction of Holocene SST in the Japan Sea based on radiolarian assemblages

*Takuya ITAKI1, Isao MOTOYAMA2, Yasumi YAMADA3, Kenji M. MATSUZAKI1, Ken IKEHARA1, Ryuji TADA4 (1.Geological Survey of Japan / AIST, 2.Department of Earth and Environmental Sciences, Yamagata University, 3.Marine Works Japan Ltd, 4.Department of Earth and Planetary Science, Graduate School of Science, The Univeristy of Tokyo)

Keywords:paleo sea surface temperature, microfossils, paleoceanography, polar front

The Tsushima Warm Current (TWC), which is only source of oceanic water in the Japan Sea during Holocene, transports heart, salt and nutrients from the East China Sea via the Tsushima Strait, and plays important roles of climate and ecosystem of the Japan Sea. In this study, we reconstructed Holocene changes of sea surface temperature (SST) based on radiolarian fossil records from more than 20 cores. In south of the polar front, the SST increased significantly through 12.5 ka to 8 ka, and showed millennial scale oscillations after that. On the other hand, low SST conditions have continued at north of the polar front due to weak influence of the TWC.