日本地球惑星科学連合2021年大会

講演情報

[J] ポスター発表

セッション記号 M (領域外・複数領域) » M-IS ジョイント

[M-IS18] 地球掘削科学

2021年6月4日(金) 17:15 〜 18:30 Ch.21

コンビーナ:黒田 潤一郎(東京大学大気海洋研究所 海洋底科学部門)、道林 克禎(名古屋大学 大学院環境学研究科 地球環境科学専攻 地質・地球生物学講座 岩石鉱物学研究室)、藤原 治(国立研究開発法人産業技術総合研究所 地質調査総合センター)、氏家 恒太郎(筑波大学生命環境系)

17:15 〜 18:30

[MIS18-P04] Introduction of SWAIS 2C (Sensitivity of the West Antarctic Ice Sheet to 2 Degrees Celsius) project and Japanese contribution

*菅沼 悠介1,2、関 宰3、野木 義史1,2、SWAIS-2C project menbers (1.国立極地研究所、2.総合研究大学院大学、3.北海道大学低温研究所)

キーワード:南大洋・南極氷床

The Antarctic Ice Sheet is one of the most significant potential contributors to future sea-level changes. However, the response of the Antarctic Ice Sheet to projected warming and its contribution to the sea level rise remains mostly uncertain. The on-going project, called SWAIS 2C (Sensitivity of the West Antarctic Ice Sheet to 2 Degrees Celsius), will focus on understanding past and current drivers, mechanisms, and feedbacks that influence the retreat of the West Antarctic Ice Sheet (WAIS), to reduce uncertainty in numerical model projections of future changes. This project is designed to address the overarching questions: How will marine-based ice sheets respond to a 2°C increase in global temperature, and what are the local, regional, and global environmental consequences of the ice sheet response if temperatures ultimately exceed the 2°C increase?
Japanese scientists are involved in the international team of geologists, glaciologists, geophysicists, and ice sheet and climate modelers who will use a proven ‘trident’ approach that integrates studies of past and present ice sheet behavior to improve future projections (using models) of WAIS response to climate change. The project will carry out the sediment drilling underneath of the ice shelf at two locations along the Siple Coast in the West Antarctic interior based on newly developed drilling technology to obtain a sedimentary history of past ice sheet dynamics. The recovered sediment cores will be used for reconstructing past environmental change and ice sheet dynamics in the interior Ross Sea Embayment in past warm intervals when global mean temperatures were similar to those projected for the coming decades. The present-day ice sheet dynamics will be examined through detailed studies of glacial and oceanographic processes within the Ross Ice Shelf cavity and at the grounding zone. New knowledge derived from this drilling project regarding ice flow dynamics, grounding line interactions, and the influence of oceanic and atmospheric warming will be integrated into numerical models to improve simulations of ice mass change under future climate scenarios. This integrated 3-fold approach will improve projections of Antarctic ice sheet contribution to global sea level in global mean temperature up to 2°C.