Japan Geoscience Union Meeting 2019

Presentation information

[J] Poster

A (Atmospheric and Hydrospheric Sciences ) » A-CC Cryospheric Sciences & Cold District Environment

[A-CC26] Ice cores and paleoenvironmental modeling

Tue. May 28, 2019 3:30 PM - 5:00 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Ryu Uemura(University of the Ryukyus), Kenji Kawamura(National Institute of Polar Research, Research Organization of Information and Systems), Ayako Abe-Ouchi(Atmosphere and Ocean Research Institute, The University of Tokyo), Nozomu Takeuchi(Chiba University)

[ACC26-P05] A basal topographic map in the Dome Fuji region constructed from the ground-based radar survey in the JARE 59

*Shun Tsutaki1, Takashi Obase1, Shuji Fujita2,3, Ayako Abe-Ouchi1,4, Kenji Kawamura2,3,4, Kenichi Matsuoka5, Hiroshi Ohno6, Ikumi Oyabu2,7, Fumio Nakazawa2, Konosuke Sugiura8 (1.The University of Tokyo, 2.National Institute of Polar Research, 3.The Graduate University for Advanced Studies, 4.Japan Agency for Marine-Earth Science and Technology, 5.Norwegian Polar Institute, 6.Kitami Institute of Technology, 7.Japan Society for the Promotion of Science, 8.University of Toyama)

Keywords:Antarctic ice sheet, Basal topography, Radar

Drilling a deep ice core extending 1.5 million years (Ma) back in time is crucial to better understand the transition in the periodicity of the glacial cycles changed from 40 kilo year (ka) to the current 100 ka during the mid-Pleistocene transition (0.9−1.2 Ma). However, continuous ice core records more than 1 Ma have not been retrieved in the Antarctic ice sheet. Sufficient knowledge of the basal topography is crucial to modify numerical experiments that may provide a continuous record of past mechanisms of climate change. A ground-based radar survey was conducted over an area of 20000 km2 with a line spacing of 5 km in the Dome Fuji area in the 59th Japanese Antarctic Research Expedition (JARE 59, 2017−2018 Antarctic summer). In this study, we analyze the JARE 59 radar data to construct an improved map of basal topography in the Dome Fuji region to progress the identification of a suitable drilling site at the region.