Japan Geoscience Union Meeting 2015

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

[M-IS34] Paleoclimatology and paleoceanography

Wed. May 27, 2015 4:15 PM - 6:00 PM 301A (3F)

Convener:*Kazuyoshi Yamada(Museum of Natural and Environmental history, Shizuoka), Minoru Ikehara(Center for Advanced Marine Core Research, Kochi University), Tomohisa Irino(Faculty of Environmental Earth Science, Hokkaido University), Akira Oka(Atmosphere and Ocean Research Institute, The University of Tokyo), Yusuke Okazaki(Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University), Ikuko Kitaba(Research Centre for Palaleoclimatology, Ritsumeikan University), Akihisa Kitamura(Institute of Geosciences, Faculty of Science, Shizuoka University), Masaki Sano(Research Institute for Humanity and Nature), Takeshi Nakagawa(Ritsumeikan University), Akira Hayashida(Department of Environmental Systems Science, Doshisha University), Chair:Yusuke Okazaki(Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University)

4:15 PM - 4:30 PM

★ [MIS34-01] Fire activity in Japan influenced by spring temperature and vegetation type

*Jun INOUE1, Chikako OKUYAMA1, Keiji TAKEMURA2 (1.Osaka City University, 2.Kyoto University)

Keywords:fire activity, charcoal particle, spring temperature, spring insolation, vegetation type, Lake Biwa sediments

In Northeast Asia, the climatic effect on natural fire activity is poorly understood. We analyzed charcoal particles in Lake Biwa sediments, central Japan, deposited for 150,000 y to evaluate the climatic effect on fire activity. Between 130,000 and 40,000 y ago the charcoal concentration is mostly consistent with spring insolation on site driven by orbital forcing or the oxygen isotope ratio of worldwide marine sediments. Meanwhile, the variation of charcoal concentration related to vegetation change; the peak of the charcoal concentrations were in the periods with dominance of the conifer forest. This findings indicate that fire activity was controlled by spring temperature with the influence of vegetation type.