[M-IS03] Evolution and variability of the Asian monsoon in Cenozoic global climate changes

Thu. May 30, 2019 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall8, 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)

The Asian Monsoon (AM) is a part of interhemispheric atmospheric phenomena that is driven by the thermal gradient between ocean and land. Contrasts of insolation, heat content and latent heat transfer between ocean and land may have affected the behavior of the AM in the past, but the proxy records are occasionally controversial and do not show a clear picture of the AM variability. Recent proxy and modeling studies suggest that glacial pCO2 cycles could be related to the position of southern westerlies, which is sensitive to interhemispheric heat imbalance. Because monsoon is driven by the heat imbalance, knowledge on the variability of the AM is important to understand the behavior of the global climate system. In this session, presentations on the reconstruction of long-term AM variability from various archives such as IODP expedition cores, discussion on its forcing, and the roles of the AM in global climate changes are welcome.

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[MIS03-P01] 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 Irino¹ (1.Faculty of Environmental Earth Science, Hokkaido University)

[MIS03-P02] Sources and formation environment of biomass burning products in Pliocene and Pleistocene marine sediments in the Japan Sea

*Song Lu¹, Youhei Yamashita², Tomohisa Irino² (1.Graduate School of Environmental Science, Hokkaido University , 2.Faculty of Environmental Earth Science, Hokkaido University)

[MIS03-P03] Variation of mineral dust flux in peat at a high moor on the Mt. Daisetsu during Holocene

*Tomohisa Irino¹, Keisuke Hirai¹, Osamu Seki¹, James Hooper², Samuel Marx² (1.Hokkaido University, 2.University of Wollongong)

[MIS03-P04] Variations in sea surface environments recorded by algal biomarkers in the Japan Sea off the western coast of Hokkaido (IODP Site U1422) over the last 250 ka

*Asako Suzuki¹, Ken Sawada², Satoshi Furota³, Yaeko Igarashi⁴, Tomohisa Irino⁵ (1.Graduate School of Science, Hokkaido University, 2.Department of Earth and Planetary Sciences, Faculty of Science, Hokkaido University, 3.Japan Agency for Marine-Earth Science and Technology, 4.Institute for Paleoenvironment of Northern Regions, 5.Faculty of Environmental Earth Science, Hokkaido University)

[MIS03-P05] Decadal oscillation in hydrogen stable isotope ratio of long chain fatty acids in Lake Suigetsu sediment core

*Masaya Inagaki¹, Masanobu Yamamoto^1,2, Takeshi Nakagawa³ (1.Graduate School of Environmental Science, Hokkaido University, 2.Faculty of Environmental Earth Science, Hokkaido University, 3.Research Center for Palaeoclimatology, Ritsumeikan University)

[MIS03-P06] Amplitude modulation of sea surface temperature variability in the Bay of Bengal by 400-kyr eccentricity cycle

*Masanobu Yamamoto¹, Yuko Tsuchiya¹, Steven Clemens² (1.Faculty of Environmental Earth Science, Hokkaido University, 2.Department of Earth, Planetary and Environmental Sciences, Brown University)

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