[M-IS21] Global climate and ecosystem change driven by Southern Ocean and Antarctic Ice Sheet

[MIS21-P01] Dynamics of Antarctic Circumpolar Current, Weddell Gyre and sea ice distribution

*Minoru IKEHARA¹, Osamu SEKI², Akira IJIRI³, Hiroshi SATO⁴, Masanobu YAMAMOTO⁵, Naohiko OHKOUCHI³, Yusuke OKAZAKI⁶, Takuya MATSUZAKI¹ (1.Center for Advanced Marine Core Research, Kochi University, 2.ILTS, Hokkaido University, 3.JAMSTEC, 4.Senshu University, 5.Faculty of Env. Earth Science, Hokkaido University, 6.Kyushu University)

Keywords:Southern Ocean, Antarctic Circumpolar Current, Weddell Gyre, sea ice, climate change

The Southern Ocean has played an important role in the evolution of the global climate system. Area of sea ice shows a large seasonal variation in the Southern Ocean. The Southern Ocean circulation is dominated by the Antarctic Circumpolar Current (ACC), the world's longest and largest current system. The Weddell Gyre is a large clockwise gyre in the Southern Ocean, and contribute sea ice distribution in the Atlnatic and Indian sectors of the Southern Ocean. Sea ice coverage on sea surface strongly affects the climate of the Southern Hemisphere through its impacts on the energy and gas budget, on the atmospheric circulation, on the hydrological cycle, and on the biological productivity. We plan to reveal the dynamics of Southern Ocean subsystems and those interaction with global climate change by modern ocanographyical obserbations, sediment trap experiments, paleoceanographic applorch in piston and drilling cores, and climate model experiments.