Japan Geoscience Union Meeting 2021

Presentation information

Print

[E] Poster

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS05] Global climate change driven by the Southern Ocean and the Antarctic Ice Sheet

Sun. Jun 6, 2021 5:15 PM - 6:30 PM Ch.20

convener:Osamu Seki(Institute of Low Temperature Science, Hokkaido University), Yoshifumi Nogi(National Institute of Polar Research), Akira Oka(Atmosphere and Ocean Research Institute, The University of Tokyo), Yusuke Suganuma(National institute of Polar Research)

5:15 PM - 6:30 PM

[MIS05-P12] Reconstruction of ice sheet dynamics in Totten Glacier/Aurora Subglacial Basin, East Antarctica during the Last Interglacial

*Osamu Seki1, Mutsumi Iizuka1, Keiji Horikawa1, Tina van De Flierdt2, Minoru Ikehara3, Tomohisa Irino4, Takuya Itaki5, Saiko Sugisaki5 (1.Institute of Low Temperature Science, Hokkaido University, 2.Imperial College London, 3.Kochi University, 4.Faculty of Earth and Environmental Science, Hokkado University, 5.National Institute of Advanced Industrial Science and Technology)

Keywords:Antarctic ice sheet, Aurora Subglacial Basin, Totten Glacier, Last Interglacial

The Totten Glacier is one of the largest glaciers in East Antarctica. Recent observations suggest that the Totten Glacier is vulnerable to ocean warming. Ice mass loss in the Aurora Subglacial Basin, which locates behind and connects to Totten Glacier, could potentially cause a 3.5 m rise in global sea level. However, the sensitivity of the glacier-ice sheet system to ongoing global warming remains uncertain. A better understanding of Antarctic ice sheet dynamics in the warm past provides useful insights into projecting ice mass loss in the future. The Last Interglacial (LIG: 115-130 ka), which is characterized by temperatures 1 ºC warmer than the current interglacial climate, is often considered as a possible analogue for the future warm climate. Previous studies suggest significant ice mass loss in West Antarctica and the Wilkes Subglacial Basin during the LIG. However, ice sheet dynamics in the Aurora Subglacial Basin during the LIG remain an enigma. In this study, we attempt to reconstruct ice sheet dynamics in the Aurora Subglacial Basin during the LIG based on analysis of geochemical provenance proxies in two marine sediment cores, PC404 and PC504, collected off East Antarctica. Our data, together with Antarctic ice core isotope records in EDC and Vostok, suggest that the ice extent in the Aurora Subglacial Basin fluctuated dynamically during the LIG.