Japan Geoscience Union Meeting 2025

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[J] Oral

A (Atmospheric and Hydrospheric Sciences ) » A-CG Complex & General

[A-CG50] Biogeochemical linkages between the surface ocean and atmosphere

Thu. May 29, 2025 1:45 PM - 3:15 PM Exhibition Hall Special Setting (6) (Exhibition Hall 7&8, Makuhari Messe)

convener:Sohiko Kameyama(Hokkaido University), Yoko Iwamoto(Graduate School of Integrated Sciences for Life, Hiroshima University), Maki Noguchi Aita(Japan Agency for Marine-Earth Science and Technology), Naohiro Kosugi(Meteorological Research Institute), Chairperson:Sohiko Kameyama(Hokkaido University), Yoko Iwamoto(Graduate School of Integrated Sciences for Life, Hiroshima University)

1:45 PM - 2:00 PM

[ACG50-01] High-sensitivity tracer assay for oxygen consumption rate in seawater column: Application to quantify new production rate

*Urumu Tsunogai1, Yuto Watanabe1, Fumiko Nakagawa1 (1.Graduate School of Environmental Studies, Nagoya University)

Keywords:respiration, oxygen consumption rate, stable isotope tracer assay, new production rate, marine hypoxia

A new method to quantify the oxygen consumption (respiration) rate in water columns by using a stable oxygen isotope as a tracer is developed. The O2 of which oxygen atoms have been replaced by 17O (17O2) is added to water samples in bottles. The added 17O2 is converted to H217O in the bottles through the oxidation (respiration) reaction. Therefore, the oxygen consumption rates can be estimated by measuring temporal variations in the 17O/16O ratios of H2O. By using this method, the oxygen consumption rates were measured in the water columns of subarctic and subtropical area in the western North Pacific to determine new production rate in each area.