[M-IS10] 古気候・古海洋変動

[MIS10-P32] 北西太平洋亜寒帯域における最終氷期‐最終退氷期のベンチレーション変化

*岡崎 裕典¹、原田 尚美²、関 宰³ (1.九州大学、2.海洋研究開発機構、3.北海道大学)

We reconstructed the ventilation record of deep water at 2100 m depth in the western subarctic Pacific between 10 and 20 ka from radiocarbon measurements of coexisting planktic and benthic foraminiferal shells in sediment. Sediment core MU14-PS1 was obtained from the western subarctic Pacific off Kamchatka Peninsula during MU14 cruise by R/V Professor Multanovskiy in summer 2014. Radiocarbon age offset between coexisting planktic and benthic foraminiferal shells at MU14-PS1 suggests that increased ventilation from the last glacial maximum to Heinrich stadial 1. During Bolling-Allerod and Preboreal periods, small age reversals of planktic foraminiferal radiocarbon ages were found.