[M-IS01] Evolution and variability of Asian Monsoon and its linkage with Cenozoic global cooling

Mon. May 21, 2018 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Masanobu Yamamoto(Faculty of Environmental Earth Science, Hokkaido University), Ryuji Tada(Department of Earth and Planetary Science, Graduate School of Science, The Univeristy of Tokyo)

Although Asian Monsoon (AM) is a regional phenomenon, it exerts a significant impact on the global climate. Since uplift of Himalaya and Tibetan Plateau (HTP) has been considered to have played a significant role on the establishment and intensification of AM, numerous attempts have been made to prove the linkage between the HTP uplift and AM evolution, but the linkage is largely unproved till now. On the other hand, comparison of global climatic changes, pCO2 reconstructions, and AM evolution process during Cenozoic suggests that AM evolution is significantly affected by global climate changes most likely through pCO2. Thus, importance of the HTP uplift on AM evolution is questioned. However, it should be noted that the effects of the HTP uplift and AM precipitation on chemical weathering, erosion, and CO2 uptake could be acting as feedback loops on AM-HTP uplift linkage.

From July 2013 to November 2016, IODP conducted a series of expeditions such as 346 (Asian Monsoon), 353 (Indian Monsoon Rainfall), 354 (Bengal Fan), 355 (Arabian Monsoon), 356 (Indian through-flow), and 359 (Maldives Monsoon) that are related to AM evolution and its interaction with global climate system in NW Pacific and Indian Ocean regions, and exciting results are gradually coming out. We believe it is timely to start gathering and synthesizing the results of these cruises and update and exchange information and ideas to promote our understanding of AM evolution, variability, their controlling factors, and their interaction with global climate system during the Cenozoic.

[MIS01-P01] Reconstruction of Asian dust source variability since 10 Ma based on grain size specific mineral composition at IODP Site U1425 in the Japan Sea

*Mui Fa Alison Lee¹, Tomohisa Irino² (1.Graduate School of Environmental Science, Hokkaido University, 2.Faculty of Environmental Earth Science, Hokkaido University)

[MIS01-P02] Two step expansion of C4 plants in northwestern India at 10 Ma and 7.5 Ma: Evidence of leaf wax carbon isotopes in IODP Site U1457 sediments

Kenta Suzuki², *Masanobu Yamamoto^1,2, Osamu Seki^2,3 (1.Faculty of Environmental Earth Science, Hokkaido University, 2.Graduate School of Environmental Sceince, Hokkaido University, 3.Institute of Low Temperature Science, Hokkaido University)

[MIS01-P03] Changes in provenance and chemical weathering of Cenozoic fluvial sediments in the southwestern margin of Tarim Basin deduced from their mineral and chemical compositions

*Tomohiro Kanzaki¹, Ryuji Tada¹, Akinori Karasuda¹, Ke WANG¹, Hitoshi Hasegawa², Hongbo Zheng³ (1.University of Tokyo, 2.Kochi University, 3.Yunnan University)

[MIS01-P04] Biomass burning history and possible origin of fire in East Asia during the million years using chemical proxies

*Song Lu¹, Youhei Yamashita², Tomohisa Irino², Takuya Sagawa³ (1.Graduate School of Environmental Science, Hokkaido University , 2.Faculty of Environmental Earth Science, Hokkaido University, 3.Institute of Science and Engineering, Kanazawa University)

[MIS01-P05] Provenance changes of the Cenozoic terrestrial sequence in the southwestern Tarim basin and its implication to tectonics of the source area

*Aki Sakuma¹, Ryuji Tada¹, Tomohiro Yoshida¹, Hitoshi Hasegawa², Akinori Karasuda¹, Naomi Sugiura¹, Hongbo Zheng³ (1.Department of Earth and Planetary Science, School of Science, the University of Tokyo, 2.Faculty of Science and Technology, the University of Kochi, 3.Research Center for Earth System Science, Yunnan University)

[MIS01-P06] Application of cellulose oxygen isotopes in sphagunum from the Bekanbeushi mire, eastern Hokkaido to the reconstruction of“Ezo-tsuyu”and the East Asian summer monsoon during the last 2000 years.

*Hiromichi Sakurai¹, Masanobu Yamamoto¹, Osamu Seki², Takayuki Omori³, Tomonori Sato¹ (1.Faculty of Environmental Earth Science, Hokkaido University, 2.Low Temperature Research Institute, Hokkaido University, 3.The University Museum, The University of Tokyo, Japan)

Session information