[M-IS05] 南大洋・南極氷床が駆動する全球気候変動

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

*松井 浩紀¹、池原 実²、菅沼 悠介^3,4、関 宰⁵、大藪 幾美³、川村 賢二^3,4 (1.秋田大学大学院 国際資源学研究科、2.高知大学海洋コア総合研究センター、3.情報・システム研究機構　国立極地研究所、4.総合研究大学院大学 極域科学専攻、5.北海道大学低温科学研究所)

キーワード：風成塵-磁気記録対比、年代モデル、南大洋

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.