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

[MIS05-09] Assessing dust-magnetic correlation in the Indian sector of the Southern Ocean

*Hiroki Matsui¹, Minoru Ikehara², Yusuke Suganuma^3,4, Osamu Seki⁵, Ikumi Oyabu³, Kenji Kawamura^3,4 (1.Graduate School of International Resource Sciences, Akita University, 2.Center for Advanced Marine Core Research, Kochi University, 3.National Institute of Polar Research, Research Organization of Information and Systems, 4.Department of Polar Science, School of Multidisciplinary Sciences, The Graduate University for Advanced Studies (SOKENDAI), 5.Institute of Low Temperature Science, Hokkaido University)

Keywords:Dust-magnetic correlation, Age-depth model, Southern Ocean

Understanding Antarctic climate change requires integration of marine and ice core records. Recent advances in transfer of ice core chronology to marine core by signal matching will eventually allow direct comparison between marine and ice core records. Dust-magnetic correlation which utilizes great similarity between magnetic susceptibility of marine cores and aeolian dust of ice cores has been increasingly used in the Scotia Sea and the Pacific sector of the Southern Ocean (SO). However, dust-magnetic correlation has rarely been assessed in the Indian sector of the SO, hampering circum-Antarctic application of the method. Here we test dust-magnetic correlation in the Indian sector of the SO through the last 400 kyrs by age-depth model comparison of dust-magnetic correlation, oxygen isotope correlation, and published radiocarbon dates. We discuss potential effect of age-depth errors and bioturbation process to integrate traditional marine core chronologies with ice core chronology.