Session information

[J] Oral

A (Atmospheric and Hydrospheric Sciences ) » A-OS Ocean Sciences & Ocean Environment

[A-OS26] Coastal Ecosystems: Land-to-Ocean Biogeochemical Cycles and their Ecosystem Functions

Tue. May 26, 2026 10:45 AM - 12:15 PM 106 (International Conference Hall, Makuhari Messe)

Chairperson:Sugimoto Ryo(Faculty of Marine Biosciences, Fukui Prefectural University), Nakamura Takashi(School of Environment and Society, Institute of Science Tokyo), Higuchi Tomihiko(Graduate School of Agriculture, Ehime University)

Coastal marine ecosystems are complex open systems interacting with surrounding watersheds, outer ocean, and the atmosphere, providing a wealth of various ecosystem services to human life. Simultaneously, they are also influenced strongly and often negatively by human activities. Despite occupying relatively small areas, these ecosystems exhibit remarkably high biological productivity and biodiversity, and they provide a wide range of ecosystem services. Building on the fundamental processes of biogeochemical cycles linking land and ocean through rivers, groundwater, and coastal hydrodynamics, this session addresses the structure and functioning of diverse ecosystems such as lakes, rivers, wetlands, estuaries, tidal flats, seagrass and macroalgal beds, mangroves, and coral reefs. Particularly, ecosystem connectivity, linkages among biological communities, resilience and recovery processes, responses to environmental change, and ecosystem services will be discussed. By bringing together researchers from ecology, geochemistry, environmental engineering, and related fields, the session aims to promote interdisciplinary discussions that advance our understanding of aquatic productivity systems from terrestrial to coastal zones, and to develop an integrated perspective on how climate change and human activities influence aquatic ecosystems. This session further seeks to promote knowledge exchange that will contribute to the development and social implementation of sustainable management, conservation, and restoration strategies. We welcome contributions based on theoretical studies, laboratory experiments, field observations, remote sensing, and numerical modeling, covering a broad spectrum of topics including biogeochemical cycling and ecosystem functions, community connectivity, spatiotemporal dynamics of water and material flows, biodiversity conservation, and fisheries resource sustainability.

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10:45 AM - 11:00 AM

[AOS26-07] Ecosystem digital twin for sustainable aquaculture in Shizugawa Bay, Miyagi, Japan

*Takashi Nakamura¹, Takashi Sakamaki², Shun Miyagi¹, Mizuki Takahashi¹, Haruko Kurihara³ (1. School of Environment and Society, Institute of Science Tokyo, 2. Tohoku University, 3. University of the Ryukyus)

11:00 AM - 11:15 AM

[AOS26-08] Long-term modulations of water quality associated with climate change and water quality predictions using Machine Learning for Lake Kasumigaura

*Takuma Gomi¹, Eiji Masunaga¹, Herminio Foloni-Neto² (1. Ibaraki University, 2. University of Vicrtoria)

11:15 AM - 11:30 AM

[AOS26-09] Spatiotemporal Analysis of Terrestrial Influences on Sagami Bay Using Ocean Color Satellite Data

*Hiroyuki Tate¹, Hiroto Higa¹, Tomoya Iwata², Maiko Kagami¹ (1. Yokohama National University, 2. University of Yamanashi)

11:30 AM - 11:45 AM

[AOS26-10] Evaluation of the impacts of seawater recirculation and groundwater discharge in Osaka Bay using radium isotopes

*Shiho Kobayashi¹, Ryo Sugimoto², Toshimi Nakajima³, Satoshi Nakada⁴ (1. Kyoto University, 2. Fukui Prefectural University, 3. University of Tokyo, 4. National Institute for Environmental Studies)

11:45 AM - 12:00 PM

[AOS26-11] Evaluation of recirculated submarine groundwater discharge in Tokyo Bay using Ra isotopes

*Kaori Harashima¹, Yu Umezawa¹, Toshimi Nakajima², Toshiya Katano³, Hironori Higashi⁴, Satoshi Nakada⁴, Ryo Sugimoto⁵ (1. Tokyo University of Agriculture and Technology, 2. Atmosphere and Ocean Research Institute, The University of Tokyo, 3. Tokyo University of MArine Science and Technology, 4. National Institute for Environmental Studies, 5. Faculty of Marine Biosciences, Fukui Prefectural University)

12:00 PM - 12:15 PM

[AOS26-12] Investigation and numerical analysis of submarine groundwater discharge along the Yui coastal zone of Suruga Bay.

*Yasuhide Muranaka¹, Masahiko Ono², Masahito Kawai¹, Takafumi Kamitani¹, Tetsuhiro Watano¹, Reo Ikawa² (1. Shizuoka Institute of Environment and Hygiene, 2. National Institute of Advanced Industrial Science and Technology)