Japan Geoscience Union Meeting 2015

Presentation information


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

[M-IS34] Paleoclimatology and paleoceanography

Wed. May 27, 2015 6:15 PM - 7:30 PM Convention Hall (2F)

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)

6:15 PM - 7:30 PM

[MIS34-P09] The response of terrestrial climate variations in the orbital cycles based on a marine pollen records

*Manami SUGAYA1, Masaaki OKUDA2, Makoto OKADA3 (1.Graduate school of Sci. and Eng. Ibaraki University, 2.Natural History Museum and Institute of Chiba, 3.Department of science, Ibaraki University)

Keywords:pollen, paleoclimate reconstruction, marine core

A pollen analysis of drilled marine core, that is effective for long-scale and continuous paleoclimate reconstruction because marine sediments have direct d18O-based timescales, which is absent in terrestrial materials. In this study, we carried out pollen analysis to the core C9001C drilled off Shimokita Peninsula, for paleoclimate reconstruction and compose pollen stratigraphy during the Brunhes paleomagnetic chron. As a result, during the interglacial periods is dominated by cool temperate pollen assemblages that is similar to the present-day Shimokita vegetation. In contrast, during the glacial periods is dominated by subarctic pollen assemblages, and the weak glacial periods or the transition periods of interglacial to glacial dominated by cool mixed pollen assemblages. In order to extract more detailed paleoclimate information we apply the modern analogue technique to our pollen records. As a result, paleoclimatic parameters suggested two different variations of paleo-temperature and paleo-precipitation, these are good correlates glacial-interglacial cycles and summer insolation variations, respectively.