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

Thu. May 28, 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)

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.

11:00 AM - 11:15 AM

[MIS28-17] Is Lake Suigetsu sediment recording annual-scale dust flux changes?

*Kana NAGASHIMA1, Yoshiaki SUZUKI2, Kazuyoshi YAMADA3, Tomohisa IRINO4, Ryuji TADA2, Masayuki TAKIGAWA1, Yukari HARA5, Takeshi NAKAGAWA6, Project members SG06/126 (1.JAMSTEC, 2.Graduate school of Science, The University of Tokyo, 3.Museum of Natural and Environmental history, Shizuoka, 4.Faculty of Environmental Earth Science, Hokkaido University, 5.Research Institute for Applied Mechanics, Kyushu University, 6.Ritsumeikan University)

11:15 AM - 11:30 AM

[MIS28-18] Variabilities of water pH and temperature in Lake Biwa based on branched GDGT distribution over the last 280,000 years

*Taku AJIOKA1, Masanobu YAMAMOTO2, Keiji TAKEMURA3, Akira HAYASHIDA4, Hiroyuki KITAGAWA5 (1.Institute of Geology and Geoinformation, AIST, 2.Faculty of Enviromental Earth Science, Hokkaido University, 3.Beppu Geothermal Research laboratory Institute for Geothermal Science, Kyoto University, 4.Department of Environmental Systems Science, Doshisha University, 5.Graduate School of Environmental Studies, Nagoya University)