[M-IS10] [EJ] 南大洋・南極氷床が駆動する全球気候変動

[MIS10-06] コンラッドライズにおける最終氷期以降の放散虫群集変化と海洋環境との関係

*板木 拓也¹、Cortese Guiseppe²、池原 実³ (1.産業技術総合研究所、2.Department of Paleontology, GNS Science、3.高知大学)

キーワード：古海洋学、生物生産性、中層水

It is well known that the oceanic circulation in the Southern Ocean plays an important role in the global climate changes. For reconstruction of the past ocean circulation in the Southern Ocean, siliceous microfossils such as diatoms and radiolarians preserved abundantly in deep-sea sediments are widely used as paleoceanographic proxies. Fossil assemblages of diatoms (phytoplankton) indicate usually surface water environments, while radiolarians (zooplankton) can be used as indicator for not only surface but also intermediate and deep water conditions because of their discrete habitat depths for each species. In this study, quantitative analysis of radiolarians was conducted for core COR-1bPC (54°S) from Conrad Rise in the Indian Ocean sector of the Southern Ocean.