JpGU-AGU Joint Meeting 2026

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[E] Oral

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

[A-OS20] Biogeochemical and Ecological Processes in the Open Ocean

Thu. May 28, 2026 9:00 AM - 10:30 AM 105 (International Conference Hall, Makuhari Messe)

Chairperson:Kodama Taketoshi(The University of Tokyo), Shigemitsu Masahito(Japan Agency for Marine-Earth Science and Technology), Shiozaki Takuhei(Atmosphere and Ocean Research Institute, The University of Tokyo), Martiny Adam(University of California Irvine)

9:30 AM - 9:45 AM

[AOS20-03] Ammonium isotope ratios in the subarctic North Pacific Ocean

*Akiko Makabe1, Chisato Yoshikawa1, Takuro Nunoura1, Keisuke Koba2 (1. Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2. Kyoto University)

Keywords:Nitrogen cycle, Ammonium, Stable isotope, Nitrification