Japan Geoscience Union Meeting 2016

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Poster

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

[M-IS17] Paleoclimatology and paleoceanography

Mon. May 23, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Tomohisa Irino(Faculty of Environmental Earth Science, Hokkaido University), Minoru Ikehara(Center for Advanced Marine Core Research, Kochi 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), Ryuji Tada(Department of Earth and Planetary Science, Graduate School of Science, The Univeristy of Tokyo), Takeshi Nakagawa(Ritsumeikan University), Akira Hayashida(Department of Environmental Systems Science, Doshisha University)

5:15 PM - 6:30 PM

[MIS17-P19] Diagnose oscillation properties of δ18O embeded in ice cores from Antarctica and Greenland

*Yuma Hasebe1,2, Yuko MOTIZUKI1,2, Yoichi Nakai1, Kazuya Takahashi1 (1.RIKEN, 2.Saitama Univ.)

Keywords:oxygen isotope ratio, ice cores

Analysing water stable isotopes is one of the ways to understand global climate change in the past. The temperature proxy using ice cores has been established in glaciology, and is defined as oxygen isotope δ18O. The objective in our presentation is to investigate the relationship between the temperature proxy, δ18O and solar activity.
Periodicities in an annual ice-core δ18O record (Graf et al. 2002) obtained from Dronning Maud Land (DML), Antarctica, were examined. We obtained 21-year and 194-year cycles in the data with Fourier and Autoregressive model time series analyses. We will also discuss significance for the obtained power peaks and their relation with the known solar modulation cycles about 22-year and 200-year.
DML ice-core might be affected by the cosmic rays that directly reflected the solar magnetic activity. We will also analyze a Greenland ice core for comparison.