[M-IS20] 南大洋・南極氷床が駆動する全球気候変動

[MIS20-P06] GDGT based SST records in the Scotia Sea over the past 800 kyrs

*関 宰¹、山本 正伸³、IODP expedition 382 scientists² (1.北海道大学低温科学研究所、2.IODP Expedition 382、3.北海道大学大学院地球環境科学研究院)

キーワード：南大洋、水温復元、後期更新世

Southern Ocean is thought to play an important role in global climate and carbon cycle on the glacial-interglacial cycles. However, interaction between Southern Ocean and Antarctica remains uncertain due to lack of continuous SST record in the high latitude region. In this study, we measured GDGTs in sediment cores, U1537 and U1538 collected from the Scotia Sea during the IODP Expedition 382 to reconstruct changes in SST in the high latitude region of the Southern Ocean over the past 870 kyrs. The SSTs in the Scotia are Sea closely couple with Antarctic air temperature, SST in mid latitude Southern Ocean and CO2 over the past 800 kyrs, indicating a tight climatic link between mid to high latitude regions of the Southern Hemisphere.