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

Thu. May 28, 2015 9:00 AM - 10:45 AM 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:Masanobu Yamamoto(Faculty of Environmental Earth Science, Hokkaido University)

With increasing awareness of human impact on global climate change, people pay more attention to the changes in spatial pattern, magnitude, and periodicity of climatic changes, as well as intensity and frequency of extreme weather, which are all relevant to near future regional-scale climatic changes and natural disasters. Having robust knowledge on magnitudes, frequencies, spatial patterns, and mechanisms of past climatic changes is a prerequisite to understand near future climatic changes. However, existing paleo-climatic records do not have sufficient spatio-temporal resolutions and age precision to address key questions. In addition, types of proxies as well as their precisions are variable and not inter-calibrated to each other. Recently, high-resolution absolute time scale back to 50 ka was established using varved sediments of Lake Suigetsu that enables us to reconstruct paleo-climatic changes in such high resolution as decadal or even annual. Likewise, continuous sediment records back to more than 2.5 Ma were recovered from the Sea of Japan by IODP Exp. 346, which has potential to provide a reference time scale for the entire Quaternary in East Asia-NW Pacific region. We aim to extend these reference time scales to paleo-observatory sites in East Asia-NW Pacific region using various stratigraphic correlation techniques and standardized protocols. The paleo-climate observatory network would allow us to interrogate causal links between components of the climate system.

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9:00 AM - 9:15 AM

[MIS28-10] Relationship between variabilities of orbital- and millennial-scale sedimentary rhythms in the Onnagawa Formation

*Shunsuke KUROKAWA¹, Ryuji TADA¹, Takuya ITAKI², Satoshi TAKAHASHI¹ (1.Department of Earth and Planetary Science, University of Tokyo, 2.Geological Survey of Japan, AIST)

9:15 AM - 9:30 AM

[MIS28-11] Issues of Cenozoic tephra study-for beginning of tephroinfomatics

*Kaori AOKI¹ (1.Faculty of Geo-Environmental Science, Rissho University)

9:30 AM - 9:45 AM

[MIS28-12] Importance of marine tephra to connect the events among the different environments: Examples from northern Japan Trench

*Ken IKEHARA¹, Kazuko USAMI¹, Toshiya KANAMATSU² (1.Geological Survey of Japan, AIST, 2.CEAT, JAMSTEC)

9:45 AM - 10:00 AM

[MIS28-13] The outline of the sandbar drilling in the lower reach of Yangtze (YD15) to reconstruct flood history

*Keita SAITO¹, Ryuji TADA¹, Hongbo Zheng², Tomohisa IRINO³, Ke WANG³, Chao Luo⁴, Yuya TSUNAZAWA¹, Saiko SUGISAKI¹ (1.University of Tokyo, 2.Nanjing Normal University, 3.Hokkaido University, 4.Nanjing University)

10:00 AM - 10:15 AM

[MIS28-14] Provenance variability associated with East Asian Summer Monsoon precipitation change during the middle to late Holocene

*Ke WANG¹, Ryuji TADA², Tomohisa IRINO¹, Hongbo ZHENG³, Keita SAITO², Saiko SUGISAKI², Masao UCHIDA⁴ (1.Hokkaido University, 2.The University of Tokyo, 3.Nanjing Normal Univ., 4.National Institute for Environmental Studies)

10:15 AM - 10:30 AM

[MIS28-15] OSL dating of Holocene Yangtze delta sediments: implications for sedimentation mechanisms

*Saiko SUGISAKI¹, Jan-Pieter Buylaert², Andrew Murray³, Ryuji TADA¹, Hongbo Zheng⁴, Ke WANG⁵, Keita SAITO¹, Tomohisa IRINO⁵, Masao UCHIDA⁶ (1.University of Tokyo, 2.Aarhus University, 3.Technical University of Denmark, 4.Nanjing Normal University, 5.Hokkaido University, 6.National Institute for Environmental Studies)

10:30 AM - 10:45 AM

[MIS28-16] Typhoon and Baiu-season precipitation reconstructed by the flux of suspended detrital material in Lake Suigetsu

*Yoshiaki SUZUKI¹, Ryuji TADA¹, Kana NAGASHIMA², Tomohisa IRINO³, Kazuyoshi YAMADA⁴, Takeshi NAKAGAWA⁵, Hideaki KOJIMA⁶, Project members SG12/06⁷ (1.Univ. Tokyo, 2.JAMSTEC, 3.Hokkaido University, 4.Museum of Natural and Environmental history, Shizuoka, 5.Ritsumeikan University, 6.Wakasa-Mikata Jomon Museum, 7.none)