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投稿締切：2026年1月23日

OS26 From Biology to Clouds: Biogeochemical Processes at the Air–sea Boundary

Session Description:
Air–sea interactions are central to the functioning and variability of the Earth’s climate system, and biogeochemical processes play a key role in shaping these interactions. Marine biota drives the production and degradation of organic matter, influencing the fluxes of carbon dioxide, volatile organic compounds and halogenated compounds between the ocean and atmosphere. These processes contribute to the formation of marine aerosols (such as organics, sulfate, and sea salt) which can act as cloud condensation nuclei and ice nuclei, thereby affecting cloud properties, precipitation, and climate feedback. Recent advances in molecular biology and omics approaches have revealed unprecedented details about the diversity and function of microbial communities which are key players of biogeochemical processes. At the same time, autonomous technologies (AUVs, drones, floats) and remote sensing provide new perspectives on dynamic processes at the ocean–atmosphere boundary. Coupled with Earth system and regional climate models, these tools allow us to explore multiscale linkages from local biological activity to global climate responses. However, large knowledge gaps still remain, especially regarding extreme events such as marine heatwaves, dust deposition, and strong wind events, which may significantly alter biological responses and their biogeochemical feedback. This session encourages contributions from: field, experimental, and laboratory studies of biogeochemical processes at the air–sea interface, microbial and organic matter dynamics linked to aerosol and cloud processes, emerging observational tools and model integration across scales, and projections under climate change and implications for
society. We aim to bring together researchers from oceanography, atmospheric science, microbiology, chemistry, and modeling to foster
interdisciplinary discussions. By advancing our understanding of biogeochemical processes in air–sea interactions, this session seeks to
strengthen international collaborations, particularly across the Asia–Oceania region, and contribute to scientific solutions to global
climate challenges.

Keywords:
Air–sea interactions; Biogeochemistry; Aerosols and clouds

Conveners:
Dr. Koji Hamasaki (The University of Tokyo)
Dr. Yoko Iwamoto (Hiroshima University)
Dr. Anoop Mahajan (CSIR-National Institute of Oceanography)
Dr. Yuzo Miyazaki (Institute of Low Temperature Science, Hokkaido University)
Dr. Yee Jun Tham (Sun Yat-sen University)