Japan Geoscience Union Meeting 2023

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[J] Oral

O (Public ) » Public

[O-01] Earth and Planetary Science Top Seminar

Sun. May 21, 2023 10:45 AM - 12:15 PM Exhibition Hall Special Setting (2) (Exhibition Hall 8, Makuhari Messe)

convener:Yasuhito Sekine(Earth-Life Science Insitute, Tokyo Institute of Technology), Tatsuhiko Hara(International Institute of Seismology and Earthquake Engineering, Building Research Institute), Katsuyoshi Michibayashi(Department of Earth and Planetary Sciences, Nagoya University), Hajime Naruse(Department of Geology and Mineralogy, Graduate School of Science, Kyoto University), Chairperson:Yasuhito Sekine(Earth-Life Science Insitute, Tokyo Institute of Technology)

10:45 AM - 11:30 AM

[O01-01] Solving the Mystery of Global Climate Change throughout the Earth’s History with Climate Models

★Invited Papers

*Ayako Abe-Ouchi1 (1.Atmosphere and Ocean Research Institute, The University of Tokyo)

Keywords:Earth History, Climate Change, Climate model

Why did climate sometimes change abruptly in the past with only a small change in forcing? Explaining the mechanisms behind past climate changes during different time periods requires a fundamental understanding of climate change itself. This, in turn, is also important for better future climate projections. In this talk, I will show results from our recent modelling studies on the so-called "abrupt climate changes" during the ice age and deglaciation, as well as on the ice age cycles whose main periodicity changed from 40 kyr to 100 kyr. Why and how the ice age started and progressed in the past 5 million years is of much interest since it is related to and influenced life on earth and human evolution. We will also discuss the challenges associated with modelling the environmental changes in the deeper times of the past to gain a greater understanding of the earth, its climate and the history of life on the planet.