Japan Geoscience Union Meeting 2025

Session information

[E] Poster

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS06] Evolution and variability of the Tropical Monsoon and Indo-Pacific climate during the Cenozoic Era

Thu. May 29, 2025 5:15 PM - 7:15 PM Poster Hall (Exhibition Hall 7&8, Makuhari Messe)

convener:Kenji Matsuzaki(Atmosphere and Ocean Research Institute, The university of Tokyo), Takuya Sagawa(Institute of Science and Engineering, Kanazawa University), Sze Ling Ho(Institute of Oceanography, National Taiwan University), Stephen J Gallagher(University of Melbourne)

The tropical monsoon system spans the African, Indian, Australian, and East Asian Monsoons. Driven by ocean-land thermal contrasts, it interacts with the global climate system. On tectonic time scales, the uplift of the Himalayas and Tibetan Plateau has been considered a significant factor in the establishment and intensification of tropical monsoon, though its importance remains debated. Paleoclimate records suggest that monsoon evolution during the Cenozoic era was also substantially influenced by global climate changes related to changes in atmospheric CO2.
The Indo-Pacific oceanography also plays a crucial role in generating land-ocean thermal contrast and water vapor circulation. The region's West Pacific Warm Pool (WPWP), the largest heat reservoir in the global ocean, significantly contributes to atmospheric heat and moisture, influencing the El Nino-Southern Oscillation (ENSO) climate pattern. The constriction of the Indonesian Seaways during the Neogene has had a major impact on the formation of the WPWP and consequently affects ENSO dynamics. However, the precise timing and mechanism of this process are still under debate.
This session aims to assess the relative importance of these processes on different time scales, from millennial to tectonic. The goal is to enhance our understanding of the evolution of the tropical Monsoon, WPWP, and ENSO variability. It also seeks to explore the controlling factors and interactions with the global climate system. Presentations based on various archives such as piston cores, DSDP/ODP/IODP cores, and land sections are encouraged. These studies welcome a broad range of paleo-environmental proxies, including geochemistry, geophysics, sedimentology, and micropaleontology. Modeling studies are also welcome to complement the proxy-based research.

5:15 PM - 7:15 PM

*Kenji Matsuzaki1, Takuya Itaki2, Yoshimi Kubota3, Kyung Eun Lee4, Isao Motoyama5, Takuya Sagawa6, Keiji Horikawa7, Masafumi MURAYAMA8, Hajime Obata1 (1.Atmosphere and Ocean Research Institute, The university of Tokyo, 2.AIST, Geological Survey of Japan, 3.National Museum of Nature and Science, 4.Korea Maritime and Ocean University, 5.Faculty of Science, Yamagata University, 6.Institute of Science and Engineering, Kanazawa University, 7.Faculty of Science, Academic Assembly, University of Toyama, 8.Faculty of Agriculture and Marine Science, Kochi University)

5:15 PM - 7:15 PM

*Hiroyuki Takata1, Minoru Ikehara2, Koji Seto3, Hirofumi Asahi4, Hyoun Soo Lim5, Sangmin Hyun6, Boo-Keun Khim7 (1.BK21 School of Earth and Environmental Systems, Pusan National University, 2.Marine Core Research Institute, Kochi University, 3.Estuary Research Center, Shimane University, 4.Fukui Prefectural Satoyama-Satoumi Research Institute, 5.Department of Geological Science, Pusan National University, 6.Marine Environmental Research Division, Korea Institute of Ocean Science and Technology, 7.Deparment of Oceanography, Pusan National University)

5:15 PM - 7:15 PM

*Arisa Seki1, Tomohisa Irino2, Ryuji Tada3, Kenji Matsuzaki4, Jumpei Yoshioka5 (1.Faculty of Science, Shinshu University, 2.Faculty of Environmental Earth Science, Hokkaido University, 3.Institute for Geo-Cosmology, Chiba Institute of Technology, 4.Atmosphere and Ocean Research Institute, The University of Tokyo, 5.Geological Survey of Japan, AIST)

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