Japan Geoscience Union Meeting 2014

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Poster

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

[M-IS30_28PO1] Paleoclimatology and paleoceanography

Mon. Apr 28, 2014 6:15 PM - 7:30 PM Poster (3F)

Convener:*Yamada Kazuyoshi(School of Human Sciences, Waseda University), Minoru Ikehara(Center for Advanced Marine Core Research, Kochi University), Tomohisa Irino Tomohisa(Faculty of Environmental Earth Science, Hokkaido University), Yusuke Okazaki(Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University), Ikuko Kitaba(Kobe University Research Center For Inland Seas), Akihisa Kitamura(Institute of Geosciences, Faculty of Science, Shizuoka University), Masaki Sano(Research Institute for Humanity and Nature), Ryuji Tada(Department of Earth and Planetary Science, Graduate School of Science, The Univeristy of Tokyo), Masakazu Yoshimori(Atmosphere and Ocean Research Institute, University of Tokyo)

6:15 PM - 7:30 PM

[MIS30-P15] Climate change history of the last 45ka of Lake Biwa based on grain size and TOC,TN of BWK12-2 piston core

*Koki MATSUHISA1, Kouji MATSUNOSHITA1, Ryosuke OKADA1, Shyohei KAWASHIMA1, Kazuyoshi YAMADA2, Yoshio INOUCHI2, Fujio KUMON3, Makoto OKAMURA4, Hiromi MATSUOKA4, Yasufumi SATOGUCHI5, Ryoma HAYASHI5 (1.School of Human Sciences, Waseda University, 2.Faculty of Human Sciences, Waseda University, 3.Department of Environmental Sciences,Faculity of Science,Shinshu University, 4.Faculty of Science, Kochi University, 5.Lake Biwa Museum)

Keywords:Lake Biwa, sediment, paleo climate, grain size, TOC, TN

Based on newly established age model of BWK12-2 piston core sediment, obtained near the Off Takashima drilling station in Lake Biwa, Japan and with about 30 C-14 dates and well dated wide spread tephra, we analyzed grain size and total organic carbon (TOC) and total nitrogen (TN) contents of the sediment. Analyzing interval of those sediments were, 4cm to grain size and 2cm to TOC and TN whose time resolutions were 30 to 120 years and 15 to 60years respectively. Comparison with Marine Isotope Stage profile shows distinct resemblance to MIS1, however, difference between MIS2 and MIS3 is not clear. On the other hand, abrupt cooling events, such as Heinrich events and Younger Dryas, are clearly recognized. Abrupt warming , such as Dansgaard Oeschger events are not clearly recognized.