[A-CG62] Changing Midlatitude Atmosphere-Ocean-Ecosystem; Processes, Coupling, and Future Perspectives

Tue. May 26, 2026 3:30 PM - 5:00 PM 201A (International Conference Hall, Makuhari Messe)

Chairperson:Sugimoto Shusaku(Graduate School of Science, Tohoku University), Ito Daiki(Fisheries Resources Institute, Japan Fisheries Research and Education Agency)

Midlatitude oceans are experiencing rapid and complex transformations, including a rise in the frequency and intensity of marine heatwaves. Around Japan in particular, ocean warming has been accelerating, with unprecedented changes in major currents such as the longest Kuroshio large meander on record, the northward retreat of the Oyashio, and the extreme northward meandering of the Kuroshio Extension. These changes have contributed to record-breaking hot summers, heavy rainfall events, and major shifts in fisheries and marine ecosystems. This session invites studies employing observational, modeling, and theoretical approaches to explore how large-scale atmospheric processes drive midlatitude ocean variability and how changes in ocean currents, temperature, and stratification feed back to influence weather, climate, and marine ecosystems. Covering a wide range of temporal and spatial scales, from synoptic variability to long-term climate change, the session aims to deepen discussions toward building a new integrated midlatitude science that connects atmospheric physics, physical oceanography, biogeochemistry, and fisheries science, taking Japan as a key perspective. With various datasets and methodologies now available, this session welcomes contributions that advance process understanding and future perspectives. Taking Japan and the western North Pacific as a focal region, we also encourage contributions addressing connections with tropical or polar regions to better understand their roles in the global climate system.

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3:30 PM - 3:45 PM

[ACG62-19] Habitable Japan (Climatic Hotspot3) project: recent achievements and observation campaigns

★Invited Papers

*Eitarou Oka¹ (1. Atmosphere and Ocean Research Institute, The University of Tokyo)

3:45 PM - 4:00 PM

[ACG62-20] Topographic Control by the Japan Trench on the Anomalous Intrusion of the Kuroshio Extension

*Toru Miyama¹ (1. Japan Agency for Marine-Earth Science and Technology, Application Laboratory)

4:00 PM - 4:15 PM

[ACG62-21] Future changes in the Kuroshio and the Kuroshio Extension in an eddy-resolving climate model

*Yukito Tamura¹, Tomoki Tozuka¹ (1. The University of Tokyo)

4:15 PM - 4:30 PM

[ACG62-22] Upper-ocean structural changes over the North Pacific subtropical associated with surface ocean warming

*Hungchun Hou¹, Shusaku Sugimoto^1,2 (1. Tohoku University, 2. Advanced Institute for Marine Ecosystem Change (WPI), Tohoku University)

4:30 PM - 4:45 PM

[ACG62-23] Roles of mesoscale current and thermal feedbacks in the Kuroshio Extension simulated by an ocean model

*Kento Usui¹, Tomoki Tozuka¹ (1. Graduate School of Science, University of Tokyo)

4:45 PM - 5:00 PM

[ACG62-24] Predictability of a cold eddy detachment from the Kuroshio large meander in April 2025 in multiyear prediction experiments using JMA/MRI-CPS3 predicted values as external forcing

*Takahiro Kusumi¹, Norihisa Usui¹, Nariaki Hirose¹, Hiroaki Asai², Yuma Kawakami¹, Kunihiro Aoki¹ (1. Meteorological Research Institute, 2. Japan Meteorological Agency)