Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Poster

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS10] Paleoclimatology and paleoceanography

Wed. May 23, 2018 1:45 PM - 3:15 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Yusuke Okazaki(Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University), Atsuhiko Isobe(Research Institute for Applied Mechanics, Kyushu University), Akihisa Kitamura(静岡大学理学部地球科学教室, 共同), Masaki Sano(Faculty of Human Sciences, Waseda University), Hitoshi Hasegawa(Faculty of Science and Technology, Kochi University), Akira Oka(Atmosphere and Ocean Research Institute, The University of Tokyo), Michinobu Kuwae(Center for Marine Environmental Studies)

[MIS10-P04] North Atlantic Deep Water influenced the intensification of Northern Hemisphere glaciation?

★Invited Papers

*Tatsuya Hayashi1, Masao Ohno1, Masahiko Sato2, Yuuki Hikasa3, Toshiro Yamanaka4, Masato Makio1, Yoshihiro Kuwahara1 (1.Kyushu University, 2.University of Tokyo, 3.Okayama University, 4.Tokyo University of Marine Science and Technology)

A role of North Atlantic Deep Water in the intensification of Northern Hemisphere glaciation and the subsequent development of early glacial and interglacial cycles is as yet not well known. To evaluate their relationships, we reconstructed high-resolution records of ice rafted debris (IRD) and isothermal remanent magnetization (IRM) from Pliocene sediments recovered at IODP Site U1314 in the Gardar Drift (North Atlantic). Our IRD record demonstrates that the circum-North Atlantic ice sheets experienced the most drastic collapse during the MIS G4 glaciation with a subsequent large deglacial warming. On the other hand, the record of the IRM acquisition curve suggests the formation of North Atlantic Deep Water was strengthened after the MIS G4 glaciation. These suggest the possibility that North Atlantic Deep Water played an important role in the intensification of Northern Hemisphere glaciation through the development of Atlantic meridional overturning circulation.