[A-CC26] アイスコアと古環境モデリング

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

*津滝 俊¹、小長谷 貴志¹、藤田 秀二^2,3、阿部 彩子^1,4、川村 賢二^2,3,4、松岡 健一⁵、大野 浩⁶、大藪 幾美^2,7、中澤 文男²、杉浦 幸之助⁸ (1.東京大学、2.国立極地研究所、3.総合研究大学院大学、4.海洋研究開発機構、5.ノルウェー極地研究所、6.北見工業大学、7.日本学術振興会、8.富山大学)

キーワード：南極氷床、基盤地形、レーダー

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.