[L-02] Frontiers in Atmospheric and Hydrospheric Science 3: Recent extreme heat events in global and Japan

Wed. May 27, 2026 10:45 AM - 12:15 PM International Conference Room (IC) (International Conference Hall, Makuhari Messe)

Chairperson:Ohte Nobuhito(Department of Social Informatics, Graduate School of Informatics, Kyoto University)

The aim of this session is to introduce the frontiers of the research areas covered by the Atmospheric and Hydrospheric Sciences Section. In recent years, both the frequency and intensity of extreme heat events have been increasing, and their occurrence involves the complex interaction of diverse processes across the atmosphere, hydrosphere, and land surface. In 2023 and 2024, unprecedented high temperatures were recorded globally and in Japan, prompting atmospheric and hydrospheric scientists to undertake investigations of these phenomena from multiple perspectives. In this lecture series, atmospheric science contributions will explore the multifaceted factors behind the extreme heat events of 2023 and 2024, both worldwide and in Japan. Topics include the influence of each ocean basin and land surface on the atmosphere, as well as the amplification of high temperatures due to anthropogenic external forcings. From the ocean science, topics such as possible influence of ocean variability on radiative balance, ocean heat uptake, and redistribution of heat will be provided to discuss the role of ocean in the extreme heat events in 2023 and 2024. From the hydrology, the topic of the impact of recent extreme high temperatures at land and sea surfaces is provided in the context of using water isotope ratio variations to understand the dynamics of the global water cycle, including precipitation formation. We look forward to active feedback and discussion from many related researchers.

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10:45 AM - 11:15 AM

[L02-01] Record-breaking Global and North Pacific Extreme heat in 2023–2024 and its Driving Mechanisms

*Shoshiro Minobe¹, Ko Tsuchida², Yu Kosaka², Erik Behrens³, Kirsten L. Findell⁷, Norman G. Loeb⁴, Benoit Meyssignac⁶, Rowan Sutton⁵ (1. Graduate School of Science, Hokkaido University, 2. Research Center for Advanced Science and Technology, the University of Tokyo, 3. The National Institute of Water and Atmospheric Research, 4. NASA Langley Research Center, 5. University of Reading and National Centre for Atmospheric Science, 6. Université de Toulouse, LEGOS (CNES/CNRS/IRD/UT3), 7. Geophysical Fluid Dynamics Laboratory)

11:15 AM - 11:45 AM

[L02-02] Flood Early Warning Systems under Increasing Flood Risk Driven by Extreme Heat: Toward a Society Where Floods Do Not Become Disasters

*Kei Yoshimura¹, Kei Hiroi², Shinichiro Nakamura³ (1. Institute of Industrial Science, The University of Tokyo, 2. Disaster Prevention Research Institute, Kyoto University, 3. Graduate School of Engineering, Nagoya University)

11:45 AM - 12:15 PM

[L02-03] Ocean variability liked with the record high global and Northern Hemisphere surface temperature in 2023-24

*Yu Kosaka¹, Ko Tsuchida¹, Takahito Kataoka², Ayumu Miyamoto³, Masahiro Watanabe⁴, Hideo Shiogama⁵, Satoru Okajima⁶, Yoko Yamagami² (1. Research Center for Advanced Science and Technology, The University of Tokyo, 2. Japan Agency for Marine-Earth Science and Technology, 3. Scripps Institution of Oceanography, University of California San Diego, 4. Atmosphere Ocean Research Institute, The University of Tokyo, 5. National Institute for Environmental Studies, 6. Institute of Life and Environmental Sciences, University of Tsukuba)